ASME B18.6.3-2003 Machine Screws and Machine Screw Nuts

A N A M E R I C A N N A T I O N A L S T A N D A R D

Machine Screws and Machine Screw Nuts

ASME B18.6.3-2003(Revision of ASME B18.6.3-1998)

ASME B18.6.3–2003(Revision of ASME B18.6.3–1998)

Machine Screwsand MachineScrew Nuts

A N A M E R I C A N N A T I O N A L S T A N D A R D

Three Park Avenue • New York, NY 10016

Date of Issuance: June 30, 2005

The 2003 edition of this Standard is being issued with an automatic addenda subscription service.The use of addenda allows revisions made in response to public review comments or committeeactions to be published as necessary. This Standard will be revised when the Society approves theissuance of a new edition.

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The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990

Copyright © 2005 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All rights reservedPrinted in U.S.A.

CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viCommittee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viiiCorrespondence With the B18 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

1 Introductory Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 General Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Tables1A Dimensions of Slotted Flat Countersunk Head Machine Screws. . . . . . . . . 61B Dimensions of Type I Cross Recessed Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71C Dimensions of Type IA Cross Recessed Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81D Dimensions of Type II Cross Recessed Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91E Dimensions of Type III Square Recessed Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102A Dimensions of Slotted 100 deg Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112B Dimensions of Type I Cross Recessed 100 deg Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122C Dimensions of Type IA Cross Recessed 100 deg Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132D Dimensions of Type II Cross Recessed 100 deg Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143A Dimensions of Slotted Close Tolerance 100 deg Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153B Dimensions of Type I Cross Recessed Close Tolerance 100 deg Flat

Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163C Dimensions of Type IA Cross Recessed Close Tolerance 100 deg

Flat Countersunk Head Machine Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173D Dimensions of Type II Cross Recessed Close Tolerance 100 deg Flat

Countersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184A Dimensions of Slotted Oval Countersunk Head Machine Screws. . . . . . . . 204B Dimensions of Type I Cross Recessed Oval Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224C Dimensions of Type IA Cross Recessed Oval Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244D Dimensions of Type II Cross Recessed Oval Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264E Dimensions of Type III Square Recessed Oval Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285A Dimensions of Slotted Undercut Flat Countersunk Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295B Dimensions of Type I Cross Recessed Undercut Flat Countersunk Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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5C Dimensions of Type IA Cross Recessed Undercut Flat CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

5D Dimensions of Type II Cross Recessed Undercut Flat CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5E Dimensions of Type III Square Recessed Undercut Flat CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

6A Dimensions of Slotted Undercut Oval Countersunk Head MachineScrews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6B Dimensions of Type I Cross Recessed Undercut Oval CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6C Dimensions of Type IA Cross Recessed Undercut Oval CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6D Dimensions of Type II Cross Recessed Undercut Oval CountersunkHead Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

6E Dimensions of Type III Square Recessed Undercut OvalCountersunk Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

7A Dimensions of Type I Cross Recessed Flat Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7B Dimensions of Type IA Cross Recessed Flat Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

7C Dimensions of Type II Cross Recessed Flat Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

8A Dimensions of Type I Cross Recessed Oval Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

8B Dimensions of Type IA Cross Recessed Oval Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

8C Dimensions of Type II Cross Recessed Oval Countersunk Trim HeadMachine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

9A Dimensions of Slotted Pan Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . 519B Dimensions of Type I Cross Recessed Pan Head Machine Screws . . . . . . . 529C Dimensions of Combination Slotted — Type I Cross Recessed Pan

Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539D Dimensions of Type IA Cross Recessed Pan Head Machine Screws . . . . . 549E Dimensions of Combination Slotted — Type IA Cross Recessed Pan

Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559F Dimensions of Type II Cross Recessed Pan Head Machine Screws . . . . . . 569G Dimensions of Type III Square Recessed Pan Head Machine Screws . . . . 579H Dimensions of Combination Slotted — Type III Square Recessed

Pan Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5810A Dimensions of Slotted Fillister Head Machine Screws . . . . . . . . . . . . . . . . . . 5910B Dimensions of Type I Cross Recessed Fillister Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6010C Dimensions of Type IA Cross Recessed Fillister Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6110D Dimensions of Type II Cross Recessed Fillister Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6210E Dimensions of Type III Square Recessed Fillister Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6311 Dimensions of Slotted Drilled Fillister Head Machine Screws. . . . . . . . . . . 6412A Dimensions of Slotted Truss Head Machine Screws . . . . . . . . . . . . . . . . . . . . 6512B Dimensions of Combination Slotted — Type I Cross Recessed Truss

Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6612C Dimensions of Type I Cross Recessed Truss Head Machine Screws . . . . . 6712D Dimensions of Type IA Cross Recessed Truss Head Machine Screws . . . . 6812E Dimensions of Type II Cross Recessed Truss Head Machine Screws. . . . . 6912F Dimensions of Type III Square Recessed Truss Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

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12G Dimensions of Combination Slotted — Type III Square RecessedTruss Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

13A Dimensions of Slotted Binding Head Machine Screws . . . . . . . . . . . . . . . . . . 7213B Dimensions of Type I Cross Recessed Binding Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7313C Dimensions of Type IA Cross Recessed Binding Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7413D Dimensions of Type II Cross Recessed Binding Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7513E Dimensions of Type III Square Recessed Binding Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7614A Dimensions of Plain and Slotted Regular and Large Hex Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7814B Dimensions of Type I Cross Recessed Indented Regular and Large

Hex Head Machine Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8014C Dimensions of Type I Cross Recessed Non-Indented Regular and

Large Hex Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8215A Dimensions of Plain and Slotted Hex Washer Head Machine Screws. . . . 8315B Dimensions of Type I Cross Recessed Indented Hex Washer Head

Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8515C Dimensions of Combination Slotted — Type I Cross Recessed

Indented Hex Washer Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . 8716A Dimensions of Slotted Round Head Machine Screws . . . . . . . . . . . . . . . . . . . 8816B Dimensions of Type I Cross Recessed Round Head Machine Screws . . . . 8916C Dimensions of Combination Slotted — Type I Cross Recessed

Round Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9016D Dimensions of Type IA Cross Recessed Round Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9116E Dimensions of Combination Slotted — Type IA Cross Recessed

Round Head Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9216F Dimensions of Type II Cross Recessed Round Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9316G Dimensions of Type III Square Recessed Round Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9417A Dimensions of Slotted Round Washer Head Machine Screws . . . . . . . . . . . 9517B Dimensions of Type I Cross Recessed Round Washer Head Machine

Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9618 Dimensions of Square and Hex Machine Screw Nuts. . . . . . . . . . . . . . . . . . . 9719 Dimensions of Header Points for Machine Screws Before Threading . . . . 98

Mandatory AppendicesI Protrusion Gaging of Flat Countersunk Heads . . . . . . . . . . . . . . . . . . . . . . . . . 99II Across-Corners Gaging of Hex Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100III Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101IV Wobble Gaging of Recessed Heads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110V Dimensions for No. 0000, No. 000, and No. 00 Thread Sizes . . . . . . . . . . . . 113

Nonmandatory AppendicesA Formulas for Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114B Wrench Openings for Hex Head Screws, and Square, and Hex Nuts . . . . 122

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FOREWORD

American National Standards Committee B18 for thestandardization of bolts, screws, nuts, rivets, and similarfasteners was organized in March 1922, as SectionalCommittee B18 under the aegis of the American Engi-neering Standards Committee (later the American Stan-dards Association, then the United States of AmericaStandards Institute and, as of October 6, 1969, the Ameri-can National Standards Institute, Inc.), with the Societyof Automotive Engineers and the American Society ofMechanical Engineers as joint sponsors. Subcommittee31 was subsequently established and charged with theresponsibility for technical content of standards coveringslotted and recessed head screws.

An American Standard setting forth slotted head pro-portions was approved and published in April of 1930.Over the years following the Issuance of this document,the need for standards more comprehensive than headconfigurations became apparent. At a meeting held onApril 14, 1942, Subcommittee 31 was reorganized andenlarged, and the following operating scope was estab-lished:

The scope of Subcommittee 31 shall consist of thedevelopment and promulgation of American Standardsembracing screw products variously known as machinescrews, wood screws, tapping screws, slotted head capscrews, slotted headless set screws, and machine screwnuts. The standards shall comprise complete productstandards covering all dimensions and tolerancesrequired for the specification and production of theproducts. Details shall include boundary dimensions,such as nut width and thickness; screw head dimensions;slot and recess dimensions; body dimensions; threadclassification or thread detail, as required; thread length;point design; chamfers; underhead fillets; and support-ing general specifications covering the quality, finish,and the acceptable tolerances and limits as well as anyinformation that may be necessary to insure satisfactoryapplication of the products.

Several meetings of the Subcommittee over the ensu-ing 3 years resulted in the development and acceptanceof a proposed revision containing complete productstandards coverage for slotted and recessed headmachine, tapping and wood screws; slotted head andhexagon head cap screws; and slotted headless setscrews. Following approval by the B18 Committee andsponsor organizations, this proposal was forwarded tothe American Standards Association and declared an

1 As of April 1, 1966, Subcommittee 3 was redesignated Subcom-mittee 6.

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American Standard, ASA B18.6, on April 12, 1947.Recognizing the need for further refinements, Sub-

committee 31 at a meeting held on February 1, 1951,established three standing working subgroups: one todevelop details pertinent to tapping screw threads; asecond to review, revise, and develop head dimensionsand tolerances; and a third to correlate and edit thetechnical information emanating from the other twogroups. Also at this meeting, numerous suggestedchanges were reviewed and assigned to the respectivesubgroups for further development. Additional meet-ings of the Subcommittee were held on October 9, 1952,October 29, 1953, and April 1 and 2, 1954. Between eachof these meetings the subgroups held numerous work-ing sessions and carried on technical development incooperation with the technical committees of the U.S.Machine Screw and Tapping Screw Service Bureaus.

At the April 1954 meeting, Subcommittee 3,1 conte-mplating a partial revision of the ASA B18.6 document,recommended the publication of standards for woodscrews, cap and set screws, machine screws, and tappingand drive screws in four separate documents, each ofwhich would consist of a complete product specification.This approach was confirmed by the B18 Committeewith the further stipulation that the coverage for hexa-gon head cap screws, square head set screws, andmachine screw nuts from the ASA B18.2 standard betransferred to the documents covering cap and setscrews and machine screws, respectively. It was under-stood that jurisdiction over the square head set screwsand hexagon head cap screws would remain with Sub-committee 2 and that Subcommittee 31 would retainresponsibility for machine screw nuts. Following thisconfirmation and additional direction, the preparationof proposals for the new documents was undertaken.

The proposed standard covering slotted and recessedhead machine screws and machine screw nuts wasapproved by Subcommittee 31 at a meeting held onDecember 6, 1955. After being circulated to industry forcomment, it was revised and subsequently approved byletter ballot of the B18 Committee in March of 1958.The proposal was, however, redrafted to incorporateadditional revisions and refinements adopted by Sub-committee 31 at meetings held on October 30, 1958 andSeptember 17, 1959. The revised proposal was recircu-lated to the B18 Committee and was approved by thesponsor organizations and the American StandardsAssociation and formally designated an American Stan-dard, ASA B18.6.3, on February 12, 1962.

Following issuance of the 1962 document, Subcommit-tee 31 and the working subgroups continued to developrevisions and refinements reflecting changes in industrypractices and technical improvements. Work over theintervening years culminated in the Subcommittee 6acceptance of a draft dated November 1969, incorporat-ing revisions in the following areas: inclusion of TypeIA cross recess data; addition of the No. 0000, 000, and00 sizes to most slotted head styles; extensions of size

vii

coverage for 100 deg flat countersunk heads and bindingheads in smaller sizes, and for pan heads in larger sizes;redimensioning of flat and oval countersunk heads; revi-sion of thread lengths; inclusion of appendices for wob-ble gaging of recessed heads and wrench sizes for squareand hex products; and a complete revamping of theformat.

This revision was approved as an American NationalStandard on May 22, 2003.

ASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,

Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)

OFFICERS

D. A. Clever, ChairR. D. Strong, Vice ChairS. W. Vass, Vice ChairR. L. Crane, Secretary

COMMITTEE PERSONNEL

J. Altman, Rotor Clip Co.J. H. Slass, Alternate, Rotor Clip Co.J. B. Belford, Lawson Products Inc.D. A. Clever, Deere and Co.A. P. Cockman, Ford Motor Co.T. Collier, Cam-Tech Industries Inc.R. L. Crane, The American Society of Mechanical EngineersA. C. DiCola, Wrought Washer Co.B. A. Dusina, Federal Screw WorksD. S. George, Ford Motor Co.D. L. Drobnich, Alternate, Ford Motor Co.J. Greenslade, Greenslade and Co.J. J. Grey, Fastener Consulting Services, Inc.B. Hasiuk, Defense Industrial Supply Center-PhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Rockford Fastener, Inc.J. F. Koehl, Spirol International Corp.W. H. Kopke, ITW Assembly ComponentsM. Levinson, Alternate, ITW ShakeproofJ. G. Langenstein, ConsultantL. L. Lord, Caterpillar Inc.W. J. Lutkus, Heli Coil EmhartA. D. McCrindle, Canadian Fasteners InstituteK. E. McCullough, ConsultantR. B. Meade, Textron Fastening SystemsM. D. Prasad, General Motors Corp.S. Savoji, ITW MedalistW. Schevey, BGM Fastener Co., Inc.R. D. Strong, General Motors Corp.S. W. Vass, Lake Erie Screw Corp.C. B. Wackrow, MNP Corp.R. G. Weber, Fairfield UniversityW. K. Wilcox, ConsultantC. J. Wilson, Industrial Fasteners InstituteR. B. Wright, Wright Tool Co.J. G. Zeratsky, National Rivet and Manufacturing Co.

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SUBCOMMITTEE 6 — SLOTTED AND RECESSED HEADSCREWS

R. D. Strong, Chair, General Motors Corp.R. L. Crane, Secretary, The American Society of Mechanical EngineersD. A. Clever, Deere and Co.M. Dailey, Barnes and Reinecke, Inc.D. L. Drobnich, Ford Motor Co.J. S. Foote, Trade Association Management, Inc.D. S. George, Ford Motor Co.J. Greenslade, Greenslade and Co.A. Herskovitz, ConsultantM. W. Holubecki, Electric Boat Corp.J. Hubbard, Rockford Fastener, Inc.M. Keller, ParaCAD Technology, Co.R. W. Kerr, Kerr Lakeside Inc.H. Lo, Defense Supply Center-PhiladelphiaS. Savoji, ITW MedalistG. M. Simpson, Semblex Corp.C. B. Wackrow, MNP Corp.W. K. Wilcox, ConsultantC. J. Wilson, Industrial Fasteners Institute

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CORRESPONDENCE WITH THE B18 COMMITTEE

General. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the Committeeby requesting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:

Secretary, B18 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990

Proposing Revisions. Revisions are made periodically to the Standard to incorporate changesthat appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.

The Committee welcomes proposals for revisions to this Standard. Such proposals should beas specific as possible, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.

Interpretations. Upon request, the B18 Committee will render an interpretation of any require-ment of the Standard. Interpretations can only be rendered in response to a written request sentto the Secretary of the B18 Standards Committee.

The request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer submit his/her request in the following format:

Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the interpretation is

being requested.Question: Phrase the question as a request for an interpretation of a specific requirement

suitable for general understanding and use, not as a request for an approvalof a proprietary design or situation. The inquirer may also include any plansor drawings, which are necessary to explain the question; however, theyshould not contain proprietary names or information.

Requests that are not in this format may be rewritten in the appropriate format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.

ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.

Attending Committee Meetings. The B18 Main Committee regularly holds meetings, which areopen to the public. Persons wishing to attend any meeting should contact the Secretary of theB18 Standards Committee.

x

ASME B18.6.3-2003

MACHINE SCREWS AND MACHINE SCREW NUTS

1 INTRODUCTORY NOTES

1.1 Scope

This Standard is intended to cover the complete gen-eral and dimensional data for the various types of slottedand recessed head machine screws and machine screwnuts recognized as American National Standard. Alsoincluded are appendices that provide specifications andinstructions for the protrusion gaging of flat count-ersunk head screws; across-corners gaging of hex headscrews; penetration gaging and wobble gaging ofrecessed head screws; wrench openings for hex andsquare products; thread dimensions for the No. 0000,No. 000, and No. 00 sizes; and formulas on which dimen-sional data are based. It shall be understood, however,that where questions arise concerning acceptance ofproduct, the dimensions in the tables shall govern overrecalculation by formula.

The inclusion of dimensional data in this Standard isnot intended to imply that all of the products describedare stock production sizes. Consumers should consultwith suppliers concerning the availability of products.

1.2 Machine Screw Head Types

The head types covered by this Standard include thosecommonly recognized as being applicable to machinescrews and are enumerated and described in the follow-ing paragraphs.

1.2.1 Flat Countersunk Head. The flat countersunkhead has a flat top surface and a conical bearing surfacewith a head angle for one style of approximately 82deg and for another style of approximately 100 deg.Dimensions are given in Tables 1A through 1E, and 2Athrough 2D, respectively. Dimensions of close tolerance100 deg flat countersunk heads are given in Tables 3Athrough 3D.

1.2.2 Oval Countersunk Head. The oval countersunkhead has a rounded top surface and a conical bearingsurface with a head angle of approximately 82 deg.Dimensions are given in Tables 4A through 4E.

1.2.3 Undercut Flat and Oval Countersunk Heads. Forshort lengths, 82 deg flat and oval countersunk headmachine screws have heads undercut to 70% of normalside height to afford greater length of thread on thescrews. Dimensions are given in Tables 5A through 5E,and 6A through 6E, respectively.

1

1.2.4 Flat and Oval Countersunk Trim Heads. Flat andoval countersunk trim heads are similar to the 82 degflat and oval countersunk heads except that the size ofhead for a given size screw is one or two sizes smallerthan the regular flat and oval countersunk head size,and oval countersunk trim heads have a controlledradius where the curved top surface meets the conicalbearing surface. Trim heads are furnished only in crossrecessed head types. Dimensions are given in Tables 7Athrough 7C, and 8A through 8C, respectively.

1.2.5 Pan Head. The slotted pan head has a flat topsurface rounded into cylindrical sides and a flat bearingsurface. The recessed pan head has a rounded top sur-face blending into cylindrical sides and a flat bearingsurface. Dimensions are given in Tables 9A through 9H.

1.2.6 Fillister Head. The fillister head has a roundedtop surface, cylindrical sides, and a flat bearing surface.Dimensions are given in Tables 10A through 10E.Dimensions of drilled fillister head machine screws aregiven in Table 11.

1.2.7 Truss Head. The truss head has a low roundedtop surface with a flat bearing surface, the diameter ofwhich for a given screw size is larger than the diameterof the corresponding pan head. Dimensions are givenin Tables 12A through 12G.

1.2.8 Binding Head. The binding head has a roundedtop surface and slightly tapered sides. The bearing sur-face is flat and, where so specified by purchaser, slottedheads shall have an annular undercut adjacent to theshank. Dimensions are given in Tables 13A through 13E.

1.2.9 Hex Head. The hex head has a flat or indentedtop surface, six flat sides, and a flat bearing surface.Dimensions for regular and large heads are given inTables 14A through 14C.

1.2.10 Hex Washer Head. The hex washer head has anindented top surface and six flat sides formed integrallywith a flat washer that projects beyond the sides andprovides a flat bearing surface. Dimensions are given inTables 15A through 15C.

1.2.11 Round Head. The round head has a semiellipti-cal top surface and a flat bearing surface. In recognitionof superior slot driving characteristics of pan headscrews over round head screws, and the overlap in thedimensions of cross recessed pan heads and roundheads, it is recommended that pan head screws be used

ASME B18.6.3-2003 MACHINE SCREWS AND MACHINE SCREW NUTS

in new designs and wherever possible substituted inexisting designs. To expedite elimination of the necessityfor perpetuating stocks of finished products and tooling,it should be recognized that during the transition periodmanufacturers may, when it is agreeable to users, substi-tute pan head where round head is specified. Dimen-sions of round head machine screws are given in Tables16A through 16G.

1.2.12 Round Washer Head. The round washer headhas a semielliptical top surface formed integrally witha flat washer that projects beyond the crown of the headand provides a flat bearing surface. Dimensions aregiven in Tables 17A and 17B.

1.3 Machine Screw Nuts

The machine screw nuts covered by this Standardinclude the hexagon and square varieties. Dimensionsare given in Table 18.

1.4 Dimensions

All dimensions in this Standard are given in inches,unless stated otherwise.

1.5 Options

Options, where specified, shall be at the discretion ofthe manufacturer unless otherwise agreed upon by themanufacturer and the purchaser.

1.6 Responsibility for Modification

The manufacturer shall not be held responsible formalfunctions of product determined to be due to platingor other modifications when such plating or modifica-tion is not accomplished under the manufacturer’s con-trol or direction.

1.7 Terminology

For definitions of terms relating to fasteners or fea-tures thereof used in this Standard, refer to ASME B18.12.

1.8 Related Standards

It should be noted that standards for cap screws, setscrews, tapping screws, wood screws, drive screws,sems, washers, and other related fasteners are publishedunder separate cover as listed at the end of this Standard.

1.9 Comparison With ISO

This Standard has no ISO counterpart.

1.10 Inspection and Quality Assurance

Unless otherwise specified, acceptability to this Stan-dard shall be determined in accordance with ASMEB18.18.1.

When applicable, the following designated character-istics shall be inspected to the inspection levels shownaccording to ASME B18.18.2 and shall be within theirspecified limits.

2

Designated Characteristic Inspection Level

Recess penetration depth CSlot depth CWidth across corners CThread acceptance CTensile strength test CNut proof load test C

If verifiable in-process inspection is used, inspectionsample sizes and reporting shall be in accordance withthe applicable ASME, ASTM, or SAE quality systemconsensus standard.

For nondesignated dimensional characteristics, theprovisions of ASME B18.18.1 shall apply. Should a non-designated dimension be determined to be outside itsspecified limits, it shall be deemed conforming to thisStandardif theuser whois the installer accepts the dimen-sion, based upon form, fit, and function considerations.

2 GENERAL DATA

2.1 Heads

2.1.1 Head Height. All dimensions pertaining to headheight specified in the dimensional tables shall be mea-sured parallel to the axis of screw and those relating tothe top of head shall represent a metal-to-metal measure-ment. In other words, any truncation of rounded headcontours due to the slot or recess shall not be consideredpart of the head height.

Total or overall head heights shall be measured fromthe top of the head to the plane of the bearing surfacefor flat bearing surface type heads, to the plane of theundercut for undercut countersunk heads, and to thejunction of the conical bearing surface with the basicscrew diameter for countersunk heads.

Head side heights shall be measured from the theoreti-cal intersection of the top surface of head with the headdiameter to the plane of the bearing surface for flatbearing surface type heads, to the plane of the undercutfor undercut countersunk heads, and to the junction ofthe conical bearing surface with the basic screw diameterfor countersunk heads.

On countersunk heads, the junction of the conicalbearing surface with the basic screw diameter may notnecessarily be the same as the actual junction of headwith shank and the head height delineating the conicalbearing surface is a reference dimension.

2.1.2 Bearing Surface. The bearing surface of flatbearing surface type machine screw heads shall be per-pendicular to the axis of the screw shanks within 2 deg.

2.1.3 Gaging of Recess. The penetration gagingdepth of the recess in recessed head screws shall be theprimary inspection criteria. It is measured, parallel tothe axis of screw, from the intersection of the maximumdiameter of the recess with the head surface to the pointat which penetration gage bottoms.

MACHINE SCREWS AND MACHINE SCREW NUTS ASME B18.6.3-2003

Recess gaging values are included in the respectivedimensional tables, including the reference dimensionsof recess diameter, wing width, and total recess depth.The gaging method and specifications for gages are con-tained in Appendix III.

Recess wobble gages, gaging procedures, and permis-sible limits are given in Appendix IV.

2.1.4 Slot. The depth of the slot in slotted head screwsshall be measured, parallel to the axis of screw, from thetop of the head to the intersection of the bottom of theslot with the head surface or bearing surface.

The width of the slot shall be measured perpendicularto the axis of the screw, from the theoretical intersectionof the bottom and one side of the slot, to the theoreticalintersection of the bottom and the other side of the slot.

Unless specified by the purchaser, the slot width maybe slightly tapered from the bottom to the top, orstraight, at the option of the manufacturer.

2.1.5 Feature Positional Tolerances. The positionalrelationship of the heads and driving provisions ofscrews with respect to the shanks of screws (formerlydefined as eccentricity) shall be as follows.

(a) True Position of Head. The axis of the head shall belocated at true position relative to the axis of the screwshank within a tolerance zone having a diameter equiva-lent to 6% of the specified maximum head diameter, ormaximum width across flats of hex and hex washerheads, regardless of feature size.

(b) True Position of Recess. The recess in cross recessedhead screws shall be located at true position relative tothe axis of the screw shank within a tolerance zonehaving a diameter equivalent to 12% of the basic screwdiameter or 0.030 in., whichever is greater, regardlessof feature size.

(c) True Position of Slot. The slot in slotted head screwsshall be located at true position relative to the axis of thescrew shank within a tolerance zone having a diameterequivalent to 12% of the basic screw diameter or 0.020in., whichever is greater.

2.1.6 Underhead Fillets. Machine screws shall havea definite underhead fillet large enough to ensure thatfull fastener strength is achieved. The radius of the filletunder countersunk head screws shall be no greater than40% of the basic screw diameter. The radius of the filletunder truss heads and number 6 sized pan heads shallbe no greater than 25% of the basic screw diameter. Theradius of the fillet under all other head styles shall beno greater than 15% of the basic screw diameter.

2.2 Length

2.2.1 Measurement. The nominal length of screw Lshall be measured, parallel to the axis of screw, from theextreme point to the plane of the bearing surface forscrews having perpendicular bearing surface type heads,and to the theoretical intersection of the top surface of

3

head with the head diameter for screws having count-ersunk type heads. For all oval heads, the overall lengthLo shall be measured, parallel to the axis of the screw, fromthe extreme point to the top of the head, where:

Lo p L + C

2.2.2 Tolerance on Length. The length tolerance shallapply to Lo for all oval heads and to L for all other headstyles. The tolerance on the length of machine screwsshall conform to the following for the respective screwtypes:

Tolerance on Lengthfor Nominal Screw Size

Nominal 0000 0 1⁄4Screw Through Through ThroughLength 00 12 3⁄4

Up to 1⁄2 in., incl. −0.01 −0.02 −0.03Over 1⁄2 to 1 in., incl. −0.02 −0.03 −0.03Over 1 to 2 in., incl. . . . −0.06 −0.06Over 2 in. . . . −0.09 −0.09

2.3 Threads

2.3.1 Machine Screws. The threads on machinescrews, except for the No. 0000, No. 000, and No. 00sizes, which are covered in Appendix V, shall be UnifiedStandard, Class 2A, UNC and UNF series, or UNRCand UNRF series, at option of manufacturer, in accor-dance with ASME B1.1. For threads with additive finish,the maximum diameters of Class 2A may be exceededby the amount of the allowance; that is, the Class 2Amaximum diameters shall apply to an unplated oruncoated part, or to a part before plating or coating,whereas the basic diameters (Class 3A GO) shall applyto a part after plating or coating. The minimum majordiameter of plated or coated screws may approach butshall not be less than the Class 2A minimum limit.

2.3.2 Machine Screw Nuts. Threads shall be UnifiedStandard, Class 2B, UNC or UNF series for hexagonmachine screw nuts, and UNC series for square machinescrew nuts, in accordance with ASME B1.1.

2.4 Length of Thread

2.4.1 Machine Screws. Machine screws shall havethread lengths conforming to the following (on screwsthreaded full length, the distance to first full form threadshall be measured, parallel to the axis of screw, fromthe bearing surface of the head to the face of a noncham-fered or noncounterbored standard 3A GO thread ringgage assembled by hand as far as the thread will permit).

(a) Sizes No. 5 and Smaller. Screws of nominal lengthsequal to three diameters and shorter shall have full formthreads extending to within one pitch (thread) of thebearing surface of the head, or closer, if practicable.Nominal lengths greater than three diameters, up to andincluding 11⁄8 in., shall have full form threads extendingto within two pitches (threads) of the bearing surface


of the head, or closer, if practicable. Screws of longernominal lengths shall, unless otherwise specified, havea minimum length of full form thread of 1 in.

(b) Sizes No. 6 and Larger. Screws of nominal lengthsequal to three diameters and shorter shall have full formthreads extending to within one pitch (thread) of thebearing surface of the head, or closer, if practicable.Nominal lengths greater than three diameters, up to andincluding 2 in., shall have full form threads extendingto within two pitches (threads) of the bearing surfaceof the head, or closer, if practicable. Screws of longernominal lengths shall, unless otherwise specified, havea minimum length of full form thread of 1.50 in.

2.5 Points

Unless otherwise specified, machine screws shall haveplain sheared ends. Where so specified, header pointsshall be as shown in Table 19. Other points or pointing oflonger lengths to header point dimensions may requiremachining.

2.6 Diameter of Body

2.6.1 Machine Screws. The diameter of body onmachine screws having other than trim heads shall notbe less than the Class 2A thread minimum pitch diame-ter nor greater than the basic major diameter of thethread.

2.6.2 Trim Head Machine Screws. The diameter ofbody on trim head machine screws shall not be less thanthe Class 2A thread minimum pitch diameter nor greaterthan the basic major diameter of the thread. Screws notthreaded to the head shall have a 0.062 in., minimumlength shoulder under the head with diameter limits asspecified in the dimensional tables.

2.7 Material

2.7.1 Machine Screws. Unless otherwise specified,machine screws shall be fabricated from carbon steeland shall have a minimum tensile strength of 60,000 psi.

Machine screws, where so specified, may also be madefrom higher strength steels, corrosion resistant steel,brass, monel, aluminum alloys, or other materials, asagreed upon between the manufacturer and the pur-chaser.

2.7.2 Machine Screw Nuts. Machine screw nuts arenormally supplied in steel, corrosion resistant steel, orbrass as specified by the purchaser. Unless otherwisespecified, no physical requirements shall apply.

2.8 Finish

Unless otherwise specified, machine screws andmachine screw nuts shall be supplied with a natural (asprocessed) finish, unplated or uncoated.

4

2.9 Workmanship

Machine screws and machine screw nuts shall notcontain an excess of surface imperfections that mightaffect their serviceability, such as, burrs, seams, laps,loose scale, and other irregularities.

2.10 Designation

2.10.1 Machine Screws(a) Machine screws shall be designated by the follow-

ing data preferably in the sequence shown: productname including head type and driving provision anddesignation of the standard, nominal size (number, frac-tion, or decimal equivalent); threads per inch; nominallength (fraction or decimal equivalent); header point, ifdesired, material, protective coating, if required.

EXAMPLES:(1) Slotted Pan Head Machine Screws, ASME B18.6.3, 1⁄4 − 20 �

11⁄4, Carbon Steel, Zinc Plated per ASTM F 1941 Fe/Zn 5C.(2) Type IA Cross Recessed Fillister Head Machine Screw, ASME

B18.6.3, 6 − 32 � 3⁄4, Brass per ASTM B 21 UNS C46200.(3) Hexagon Washer Head Machine Screw, ASME B18.6.3, 0.375

− 16 � 1.50, Header Point, Carbon Steel.(4) Type II Cross Recessed Flat Countersunk Head Machine Screw,

ASME B18.6.3, 0.190 − 24 � 1.50, Carbon Steel, Phosphate/Oil per ASTM F 1137 Grade 0D.

(b) For a recommended part identifying number(PIN) system for machine screws, see ASME B18.24.

2.10.2 Machine Screws Nuts(a) Machine screws nuts shall be designated by the

following data preferably in the sequence shown: prod-uct name and designation of the standard, nominal size(number, fraction, or decimal equivalent); threads perinch, material, protective coating, if required.

EXAMPLES:(1) Hexagon Machine Screw Nut, ASME B18.6.3, 10 − 24, Steel,

Zinc Plated per ASTM F 1941 Fe/Zn 5C.(2) Square Machine Screw Nut, ASME B18.6.3, 0.138 − 32, Brass

per ASTM B 21 UNS C46200.

(b) For a recommended part identifying number(PIN) system for machine screw nuts, see ASME B18.24.

3 REFERENCES

Unless otherwise specified, the standards referencedshall be the most recent at the time of order placement.

ASME B1.1, Unified Inch Screw Threads (UN and UNRThread Form)

ASME B18.12, Glossary of Terms for Mechanical Fas-teners


ASME B18.18.1, Inspection and Quality Assurance forGeneral Purpose Fasteners

ASME B18.18.2, Inspection and Quality Assurance forHigh-Volume Machine Assembly Fasteners

ASME B18.24, Part Identifying Number (PIN) Code Sys-tem for B18 Fastener Products

Publisher: The American Society of Mechanical Engi-neers (ASME International), Three Park Avenue, NewYork, NY 10016-5990; Order Department: 22 LawDrive, Box 2300, Fairfield, NJ 07007-2300

5

ASTM B 21, Specification for Naval Brass, Rod, Bar, andShapes

ASTM F 1137, Specification for Phosphate/Oil andPhosphate/Organic Corrosion Protective Coatings forFasteners

ASTM F 1941, Specification for Electrodeposited Coat-ings on Threaded Fasteners [Unified Inch ScrewThreads (UN/UNR)]

Publisher: American Society for Testing and Materials(ASTM), 100 Barr Harbor Drive, West Conshohocken,PA 19428


Table 1A Dimensions of Slotted Flat Countersunk Head Machine ScrewsProtrusion Above GagingNominal Size or Head Gaging

Head Diameter, Slot Width, Slot Depth, Diameter,Basic Screw Length, Height, Diameter,A J T F [Note (4)]Diameter L H, Ref. G

[Note (1)] [Note (2)] Max. Min. [Note (3)] Max. Min. Max. Min. Max. Min. [Note (4)]

0000 0.0210 . . . 0.040 0.035 0.011 0.008 0.004 0.007 0.003 [Note (5)] [Note (5)] [Note (5)]000 0.0340 . . . 0.060 0.055 0.016 0.011 0.007 0.009 0.005 [Note (5)] [Note (5)] [Note (5)]

00 0.0470 . . . 0.087 0.080 0.028 0.017 0.010 0.014 0.009 [Note (5)] [Note (5)] [Note (5)]

0 0.0600 1⁄8 0.112 0.096 0.035 0.023 0.016 0.015 0.010 0.026 0.016 0.0781 0.0730 1⁄8 0.137 0.120 0.043 0.026 0.019 0.019 0.012 0.028 0.016 0.1012 0.0860 1⁄8 0.162 0.144 0.051 0.031 0.023 0.023 0.015 0.029 0.017 0.1243 0.0990 1⁄8 0.187 0.167 0.059 0.035 0.027 0.027 0.017 0.031 0.018 0.148

4 0.1120 3⁄16 0.212 0.191 0.067 0.039 0.031 0.030 0.020 0.032 0.019 0.1725 0.1250 3⁄16 0.237 0.215 0.075 0.043 0.035 0.034 0.022 0.034 0.020 0.1966 0.1380 3⁄16 0.262 0.238 0.083 0.048 0.039 0.038 0.024 0.036 0.021 0.220

8 0.1640 1⁄4 0.312 0.285 0.100 0.054 0.045 0.045 0.029 0.039 0.023 0.26710 0.1900 5⁄16 0.362 0.333 0.116 0.060 0.050 0.053 0.034 0.042 0.025 0.31312 0.2160 3⁄8 0.412 0.380 0.132 0.067 0.056 0.060 0.039 0.045 0.027 0.362

1⁄4 0.2500 7⁄16 0.477 0.442 0.153 0.075 0.064 0.070 0.046 0.050 0.029 0.4245⁄16 0.3125 1⁄2 0.597 0.556 0.191 0.084 0.072 0.088 0.058 0.057 0.034 0.539

3⁄8 0.3750 9⁄16 0.717 0.670 0.230 0.094 0.081 0.106 0.070 0.065 0.039 0.6537⁄16 0.4375 5⁄8 0.760 0.715 0.223 0.094 0.081 0.103 0.066 0.073 0.044 0.690

1⁄2 0.5000 3⁄4 0.815 0.765 0.223 0.106 0.091 0.103 0.065 0.081 0.049 0.7399⁄16 0.5625 . . . 0.932 0.878 0.260 0.118 0.102 0.120 0.077 0.089 0.053 0.851

5⁄8 0.6250 . . . 1.050 0.990 0.298 0.133 0.116 0.137 0.088 0.097 0.058 0.9623⁄4 0.7500 . . . 1.285 1.215 0.372 0.149 0.131 0.171 0.111 0.112 0.067 1.186

GENERAL NOTE: For additional requirements, refer to para. 2.

NOTES:(1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.(2) Screws of these lengths and shorter shall have undercut heads as shown in Table 5A.(3) Tabulated values determined from formula for maximum H in Appendix A.(4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-

trusion will be affected accordingly and the proper protrusion values must be recalculated using the formulas shown inAppendix I.

(5) Not practical to gage.

6


Table 1B Dimensions of Type I Cross Recessed Flat Countersunk Head Machine Screws

RecessHead Penetration Protrusion AboveNominal Size Head Gaging

Diameter, Gaging Gaging Diameter,or Basic Screw Length, Height, Recess Recess Recess Diameter,A Depth F [Note (4)]Diameter L H, Ref. Diameter, Depth, Width, Driver G

[Note (1)] [Note (2)] Max. Min. [Note (3)] M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (4)]

0 0.0600 1⁄8 0.112 0.096 0.035 0.062 0.035 0.014 0 0.036 0.020 0.026 0.016 0.0781 0.0730 1⁄8 0.137 0.120 0.043 0.070 0.043 0.015 0 0.044 0.028 0.028 0.016 0.1012 0.0860 1⁄8 0.162 0.144 0.051 0.096 0.055 0.017 1 0.056 0.040 0.029 0.017 0.1243 0.0990 1⁄8 0.187 0.167 0.059 0.100 0.060 0.018 1 0.061 0.045 0.031 0.018 0.148

4 0.1120 3⁄16 0.212 0.191 0.067 0.122 0.081 0.018 1 0.082 0.066 0.032 0.019 0.1725 0.1250 3⁄16 0.237 0.215 0.075 0.148 0.074 0.027 2 0.075 0.052 0.034 0.020 0.1966 0.1380 3⁄16 0.262 0.238 0.083 0.168 0.094 0.029 2 0.095 0.072 0.036 0.021 0.220

8 0.1640 1⁄4 0.312 0.285 0.100 0.182 0.110 0.030 2 0.110 0.087 0.039 0.023 0.26710 0.1900 5⁄16 0.362 0.333 0.116 0.198 0.124 0.032 2 0.125 0.102 0.042 0.025 0.31312 0.2160 3⁄8 0.412 0.380 0.132 0.262 0.144 0.035 3 0.139 0.116 0.045 0.027 0.362

1⁄4 0.2500 7⁄16 0.477 0.442 0.153 0.276 0.160 0.036 3 0.154 0.131 0.050 0.029 0.4245⁄16 0.3125 1⁄2 0.597 0.556 0.191 0.358 0.205 0.061 4 0.196 0.174 0.057 0.034 0.539

3⁄8 0.3750 9⁄16 0.717 0.670 0.230 0.386 0.234 0.065 4 0.225 0.203 0.065 0.039 0.6537⁄16 0.4375 5⁄8 0.760 0.715 0.223 0.402 0.250 0.068 4 0.241 0.219 0.073 0.044 0.690

1⁄2 0.5000 3⁄4 0.815 0.765 0.223 0.418 0.265 0.069 4 0.256 0.234 0.081 0.049 0.7399⁄16 0.5625 . . . 0.932 0.878 0.260 0.443 0.289 0.073 4 0.280 0.258 0.089 0.053 0.851

5⁄8 0.6250 . . . 1.050 0.990 0.298 0.565 0.329 0.079 5 0.309 0.283 0.097 0.058 0.9623⁄4 0.7500 . . . 1.285 1.215 0.372 0.628 0.393 0.087 5 0.373 0.347 0.112 0.067 1.186



omitted.(2) Screws of these lengths and shorter shall have undercut heads as shown in Table 5B.(3) Tabulated values determined from formula for maximum H in Appendix A.(4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-


7


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0.03

70.

021

0.02

60.

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0.07

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301 ⁄ 8

0.13

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120

0.04

30.

070

0.04

40.

018

00.

045

0.02

90.

028

0.01

60.

101

20.

0860

1 ⁄ 80.

162

0.14

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051

0.09

60.

055

0.02

91

0.05

30.

037

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90.

017

0.12

43

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0.18

70.

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0.05

90.

100

0.06

00.

029

10.

058

0.04

20.

031

0.01

80.

148

40.

1120

3 ⁄ 16

0.21

20.

191

0.06

70.

122

0.08

10.

030

10.

079

0.06

30.

032

0.01

90.

172

50.

1250

3 ⁄ 16

0.23

70.

215

0.07

50.

148

0.07

70.

041

20.

071

0.05

30.

034

0.02

00.

196

60.

1380

3 ⁄ 16

0.26

20.

238

0.08

30.

168

0.09

80.

041

20.

091

0.07

30.

036

0.02

10.

220

80.

1640

1 ⁄ 40.

312

0.28

50.

100

0.18

20.

112

0.04

12

0.10

70.

089

0.03

90.

023

0.26

710

0.19

005 ⁄ 1

60.

362

0.33

30.

116

0.19

80.

127

0.04

12

0.12

20.

104

0.04

20.

025

0.31

312

0.21

603 ⁄ 8

0.41

20.

380

0.13

20.

262

0.14

90.

056

30.

136

0.11

80.

045

0.02

70.

362

1 ⁄ 40.

2500

7 ⁄ 16

0.47

70.

442

0.15

30.

276

0.16

40.

057

30.

151

0.13

30.

050

0.02

90.

424

5 ⁄ 16

0.31

251 ⁄ 2

0.59

70.

556

0.19

10.

358

0.21

10.

086

40.

193

0.17

50.

057

0.03

40.

539

3 ⁄ 80.

3750

9 ⁄ 16

0.71

70.

670

0.23

00.

386

0.23

90.

086

40.

222

0.20

40.

065

0.03

90.

653

7 ⁄ 16

0.43

755 ⁄ 8

0.76

00.

715

0.22

30.

402

0.25

60.

086

40.

238

0.22

00.

073

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40.

690

1 ⁄ 20.

5000

3 ⁄ 40.

815

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50.

223

0.41

80.

271

0.08

64

0.25

30.

235

0.08

10.

049

0.73

99 ⁄ 1

60.

5625

...

0.93

20.

878

0.26

00.

440

0.29

40.

087

40.

276

0.25

80.

089

0.05

30.

851

5 ⁄ 80.

6250

...

1.05

00.

990

0.29

80.

566

0.33

40.

098

50.

307

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097

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80.

962

3 ⁄ 40.

7500

...

1.28

51.

215

0.37

20.

630

0.40

00.

099

50.

372

0.35

10.

112

0.06

71.

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ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES:

(1)

Whe

resp

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ying

nom

inal

size

inde

cim

als,

zero

spr

eced

ing

the

deci

mal

and

inth

efo

urth

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plac

esh

all

beom

itte

d.(2

)Sc

rew

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thes

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all

have

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rcut

head

sas

show

nin

Tabl

e5C

.(3

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form

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for

max

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xI.

8


Pro

tru

sio

n g

age

L

A G

F

A m

in.

H

MN

T

Th

is t

ype

of

rece

ss c

on

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f tw

o

inte

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g s

lots

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aral

lel

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des

co

nve

rgin

g t

o a

slig

htl

y

tru

nca

ted

ap

ex a

t b

ott

om

of

rece

ss.

82�

80�

Ed

ge

of

hea

d m

ay

be

rou

nd

ed o

r fl

at

Tabl

e1D

Dim

ensi

ons

ofTy

peII

Cros

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atCo

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rsun

kH

ead

Mac

hine

Scre

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Prot

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Abo

veG

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omin

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ize

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dG

agin

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eter

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cess

Pene

trat

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met

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orB

asic

Scr

ewLe

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eigh

t,Re

cess

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ssRe

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Dri

ver

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AG

agin

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ote

(5)]

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met

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th,

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th,

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[Not

e(1

)][N

ote

(2)]

Max

.M

in.

[Not

e(3

)]M

,Re

f.T,

Ref.

N,

Ref.

[Not

e(4

)]M

ax.

Min

.M

ax.

Min

.[N

ote

(5)]

00.

0600

1 ⁄ 80.

112

0.09

60.

035

0.07

80.

036

0.02

1..

.[N

ote

(6)]

[Not

e(6

)]0.

026

0.01

60.

078

10.

0730

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137

0.12

00.

043

0.09

20.

048

0.02

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.[N

ote

(6)]

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e(6

)]0.

028

0.01

60.

101

20.

0860

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162

0.14

40.

051

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060

0.02

7..

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040

0.02

90.

029

0.01

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124

30.

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187

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059

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072

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10.

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80.

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1120

3 ⁄ 16

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191

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70.

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503 ⁄ 1

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077

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40.

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196

60.

1380

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401 ⁄ 4

0.31

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285

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043

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362

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116

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1 ⁄ 40.

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344

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252

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539

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281

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760

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rad

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here

spec

ifyi

ngno

min

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mal

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ros

prec

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gth

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cim

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s.(5

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for

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give

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used

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ers

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late

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lue,

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rusi

onw

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cted

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rdin

gly

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the

form

ulas

show

nin

App

endi

xI.

(6)

Not

prac

tica

lto

gage

.

9


Pro

tru

sio

n g

age

L

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F

H

M

T P

Th

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ype

of

rece

ss h

as a

sq

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cen

ter

op

enin

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per

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sid

e w

alls

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d a

co

nic

al b

ott

om

,

wit

h t

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ges

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ieve

d o

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un

ded

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ge

of

hea

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ay

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rou

nd

ed o

r fl

at

Tabl

e1E

Dim

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ons

ofTy

peIII

Squa

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cess

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atCo

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Mac

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Scre

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onA

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)]F

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s,D

epth

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ize

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ote

(1)]

[Not

e(2

)]M

ax.

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.[N

ote

(3)]

M,

Ref.

T,Re

f.[N

ote

(4)]

Max

.M

in.

Max

.M

in.

[Not

e(6

)]

20.

0860

1 ⁄ 80.

162

0.14

40.

051

0.05

00.

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187

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059

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038

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031

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148

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3 ⁄ 16

0.21

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191

0.06

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070

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60

0.03

80.

028

0.03

20.

019

0.17

2

50.

1250

3 ⁄ 16

0.23

70.

215

0.07

50.

091

0.09

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0.05

50.

040

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40.

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0.19

66

0.13

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60.

262

0.23

80.

083

0.09

10.

096

1S0.

055

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00.

036

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10.

220

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1640

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312

0.28

50.

100

0.11

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115

2S0.

063

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039

0.02

30.

267

100.

1900

5 ⁄ 16

0.36

20.

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3

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412

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0.02

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0.47

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0.15

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0.15

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60.

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0.55

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0.19

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194

4R0.

100

0.08

50.

057

0.03

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539

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9 ⁄ 16

0.71

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3

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Scr

ews

ofth

ese

leng

ths

and

shor

ter

shal

lha

veun

derc

uthe

ads

assh

own

inTa

ble

5E.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

“R”

inth

ere

cess

size

tabu

lati

onm

eans

regu

lar

dept

hre

cess

,an

dth

e“S

”m

eans

shor

tde

pth

rece

ss.

(5)

Squ

are

rece

sses

inco

rpor

ate

asl

ight

tape

ron

the

side

sof

the

rece

ss.

This

tape

rca

nre

sult

inlo

ssof

pene

trat

ion

gagi

ngde

pth

onfin

ishe

dfa

sten

ers

due

toth

ebu

ildup

ofpl

atin

gin

the

rece

sses

.Th

ere

cess

pene

trat

ion

dim

ensi

ons

spec

ified

here

are

for

finis

hed

(pla

ted)

prod

uct.

Man

ufac

ture

rssh

ould

bead

vise

dth

atth

eysh

ould

not

use

all

this

tole

ranc

ein

the

head

ing

proc

ess,

oran

out

ofto

lera

nce

cond

itio

nco

uld

exis

taf

ter

plat

ing.

(6)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

10


Table 2A Dimensions of Slotted 100 deg Flat Countersunk Head Machine Screws

NominalHead Slot SlotSize or Head Gaging

Diameter, Width, Depth, Protrusion Above GagingBasic Screw Height, Diameter,A J T Diameter, F [Note (3)]Diameter H, Ref. G

[Note (1)] Max. Min. [Note (2)] Max. Min. Max. Min. Max. Min. [Note (3)]

0000 0.0210 0.040 0.035 0.009 0.008 0.005 0.008 0.004 [Note (4)] [Note (4)] [Note (4)]000 0.0340 0.060 0.055 0.014 0.012 0.008 0.011 0.007 [Note (4)] [Note (4)] [Note (4)]

00 0.0470 0.087 0.080 0.020 0.017 0.010 0.013 0.008 [Note (4)] [Note (4)] [Note (4)]

0 0.0600 0.112 0.095 0.026 0.023 0.016 0.013 0.008 0.020 0.012 0.0741 0.0730 0.137 0.118 0.031 0.026 0.019 0.016 0.010 0.021 0.013 0.0982 0.0860 0.162 0.142 0.037 0.031 0.023 0.019 0.012 0.022 0.014 0.1213 0.0990 0.187 0.165 0.043 0.035 0.027 0.022 0.014 0.024 0.015 0.144

4 0.1120 0.212 0.188 0.049 0.039 0.031 0.024 0.017 0.025 0.016 0.1676 0.1380 0.262 0.235 0.060 0.048 0.039 0.030 0.022 0.028 0.017 0.2148 0.1640 0.312 0.282 0.072 0.054 0.045 0.036 0.027 0.031 0.019 0.261

10 0.1900 0.362 0.329 0.083 0.060 0.050 0.042 0.031 0.034 0.021 0.3071⁄4 0.2500 0.477 0.437 0.110 0.075 0.064 0.055 0.042 0.040 0.025 0.415

5⁄16 0.3125 0.597 0.550 0.138 0.084 0.072 0.069 0.053 0.047 0.030 0.5263⁄8 0.3750 0.717 0.662 0.165 0.094 0.081 0.083 0.065 0.053 0.034 0.638



omitted.(2) Tabulated values determined from formula for maximum H in Appendix A.(3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-



11


Table 2B Dimensions of Type I Cross Recessed 100 deg Flat Countersunk HeadMachine Screws

Protrusion AboveNominalHead Gaging Diameter,Size or Head Gaging

Diameter, Recess Penetration FBasic Screw Height, Recess Recess Recess Diameter,A Gaging Depth [Note (3)]Diameter H, Ref. Diameter, Depth, Width, Driver G

[Note (1)] Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (3)]

0 0.0600 0.112 0.095 0.026 0.054 0.027 0.013 0 0.028 0.012 0.020 0.012 0.0741 0.0730 0.137 0.118 0.031 0.062 0.035 0.014 0 0.036 0.020 0.021 0.013 0.0982 0.0860 0.162 0.142 0.037 0.088 0.048 0.012 1 0.049 0.033 0.022 0.014 0.1213 0.0990 0.187 0.165 0.043 0.096 0.055 0.014 1 0.056 0.040 0.024 0.015 0.144

4 0.1120 0.212 0.188 0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.016 0.1676 0.1380 0.262 0.235 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.017 0.2148 0.1640 0.312 0.282 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.019 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.021 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.025 0.4155⁄16 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.030 0.5263⁄8 0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.034 0.638





12


Table 2C Dimensions of Type IA Cross Recessed 100 deg Flat Countersunk HeadMachine Screws

NominalSize or

Head Recess Protrusion AboveBasic Head GagingDiameter, Penetration Gaging Diameter,Screw Height, Recess Recess Recess Diameter,

A Gaging Depth F [Note (3)]Diameter H, Ref. Diameter, Depth, Width, Driver G[Note (1)] Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. Size Max. Min. Max. Min. [Note (3)]

0 0.0600 0.112 0.095 0.026 0.054 0.028 0.018 0 0.029 0.013 0.020 0.012 0.0741 0.0730 0.137 0.118 0.031 0.062 0.036 0.018 0 0.037 0.021 0.021 0.013 0.0982 0.0860 0.162 0.142 0.037 0.088 0.048 0.028 1 0.046 0.030 0.022 0.014 0.1213 0.0990 0.187 0.165 0.043 0.096 0.055 0.029 1 0.053 0.037 0.024 0.015 0.144

4 0.1120 0.212 0.188 0.049 0.110 0.070 0.029 1 0.068 0.052 0.025 0.016 0.1676 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.017 0.2148 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.019 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.021 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.025 0.4155⁄16 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.030 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.034 0.638





13


Table 2D Dimensions of Type II Cross Recessed 100 deg Flat Countersunk HeadMachine Screws

NominalProtrusionSize or

Head Above GagingBasic Head GagingDiameter, Recess Penetration Diameter, F,Screw Height, Recess Recess Recess Driver Diameter,

A Gaging Depth [Note (4)]Diameter H, Ref. Diameter, Depth, Width, Size G[Note (1)] Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. [Note (3)] Max. Min. Max. Min. [Note (4)]

0 0.0600 0.112 0.095 0.026 0.057 0.026 0.020 . . . [Note (5)] [Note (5)] 0.020 0.012 0.0741 0.0730 0.137 0.118 0.031 0.078 0.040 0.023 . . . [Note (5)] [Note (5)] 0.021 0.013 0.0982 0.0860 0.162 0.142 0.037 0.092 0.048 0.025 . . . 0.025 0.015 0.022 0.014 0.1213 0.0990 0.187 0.165 0.043 0.113 0.061 0.027 . . . 0.039 0.028 0.024 0.015 0.144

4 0.1120 0.212 0.188 0.049 0.131 0.070 0.029 . . . 0.051 0.036 0.025 0.016 0.1676 0.1380 0.262 0.235 0.060 0.157 0.086 0.033 . . . 0.068 0.051 0.028 0.017 0.2148 0.1640 0.312 0.282 0.072 0.185 0.102 0.037 . . . 0.086 0.067 0.031 0.019 0.261

10 0.1900 0.362 0.329 0.083 0.219 0.122 0.042 . . . 0.109 0.087 0.034 0.021 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.288 0.164 0.053 . . . 0.154 0.132 0.040 0.025 0.4155⁄16 0.3125 0.597 0.550 0.138 0.355 0.207 0.063 . . . 0.197 0.175 0.047 0.030 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.433 0.258 0.075 . . . 0.249 0.226 0.053 0.034 0.638



omitted.(2) Tabulated values determined from formula for maximum H in Appendix A.(3) Point same on all drivers.(4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-



14


Table 3A Dimensions of Slotted Close Tolerance 100 deg Flat Countersunk HeadMachine Screws

Nominal SizeHead Slot Slotor Basic Head Gaging

Diameter, Width, Depth, Protrusion Above GagingScrew Height, Diameter,A J T Diameter, F [Note (3)]Diameter H, Ref. G

[Note (1)] Max. Min. [Note (2)] Max. Min. Max. Min. Max. Min. [Note (3)]

4 0.1120 0.212 0.188 0.049 0.039 0.031 0.024 0.017 0.025 0.019 0.1676 0.1380 0.262 0.235 0.060 0.048 0.039 0.030 0.022 0.028 0.021 0.2148 0.1640 0.312 0.282 0.072 0.054 0.045 0.036 0.027 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.060 0.050 0.042 0.031 0.034 0.026 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.075 0.064 0.055 0.042 0.040 0.031 0.4155⁄16 0.3125 0.597 0.550 0.138 0.084 0.072 0.069 0.053 0.047 0.037 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.094 0.081 0.083 0.065 0.053 0.042 0.6387⁄16 0.4375 0.837 0.774 0.193 0.094 0.081 0.097 0.076 0.060 0.047 0.750

1⁄2 0.5000 0.957 0.887 0.221 0.106 0.091 0.111 0.088 0.066 0.053 0.8629⁄16 0.5625 1.077 1.000 0.249 0.118 0.102 0.125 0.099 0.073 0.058 0.974

5⁄8 0.6250 1.197 1.112 0.276 0.133 0.116 0.139 0.111 0.080 0.063 1.086





15


Table 3B Dimensions of Type I Cross Recessed Close Tolerance 100 deg Flat CountersunkHead Machine Screws

ProtrusionNominalHead Recess Above GagingSize or Head Gaging

Diameter, Penetration Diameter, FBasic Screw Height, Recess Recess Recess Diameter,A Gaging Depth [Note (3)]Diameter H, Ref. Diameter, Depth, Width, Driver G


4 0.1120 0.212 0.188 0.049 0.110 0.070 0.018 1 0.071 0.055 0.025 0.019 0.1676 0.1380 0.262 0.235 0.060 0.148 0.074 0.027 2 0.075 0.052 0.028 0.021 0.2148 0.1640 0.312 0.282 0.072 0.162 0.090 0.028 2 0.090 0.067 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.104 0.030 2 0.105 0.082 0.034 0.026 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.240 0.124 0.033 3 0.118 0.095 0.040 0.031 0.4155⁄16 0.3125 0.597 0.550 0.138 0.310 0.157 0.053 4 0.148 0.126 0.047 0.037 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.336 0.182 0.056 4 0.173 0.151 0.053 0.042 0.6387⁄16 0.4375 0.837 0.774 0.193 0.360 0.207 0.060 4 0.198 0.176 0.060 0.047 0.750

1⁄2 0.5000 0.957 0.887 0.221 0.386 0.234 0.063 4 0.226 0.204 0.066 0.053 0.8629⁄16 0.5625 1.077 1.000 0.249 0.418 0.265 0.069 4 0.256 0.234 0.073 0.058 0.974

5⁄8 0.6250 1.197 1.112 0.276 0.504 0.265 0.073 5 0.248 0.222 0.080 0.063 1.086





16


Table 3C Dimensions of Type IA Cross Recessed Close Tolerance 100 deg Flat CountersunkHead Machine Screws


Diameter, Penetration Diameter, FBasic Screw Height, Recess Recess Recess Diameter,A Gaging Depth [Note (3)]Diameter H, Ref. Diameter, Depth, Width, Driver G


4 0.1120 0.212 0.188 0.049 0.110 0.070 0.029 1 0.068 0.052 0.025 0.019 0.1676 0.1380 0.262 0.235 0.060 0.148 0.077 0.041 2 0.071 0.053 0.028 0.021 0.2148 0.1640 0.312 0.282 0.072 0.162 0.092 0.041 2 0.086 0.068 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.178 0.107 0.041 2 0.101 0.083 0.034 0.026 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.240 0.126 0.056 3 0.114 0.096 0.040 0.031 0.4155⁄16 0.3125 0.597 0.550 0.138 0.310 0.163 0.085 4 0.145 0.127 0.047 0.037 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.336 0.187 0.085 4 0.170 0.152 0.053 0.042 0.6387⁄16 0.4375 0.837 0.774 0.193 0.360 0.208 0.086 4 0.194 0.176 0.060 0.047 0.750

1⁄2 0.5000 0.957 0.887 0.221 0.386 0.239 0.086 4 0.222 0.204 0.066 0.053 0.8629⁄16 0.5625 1.077 1.000 0.249 0.418 0.271 0.086 4 0.253 0.235 0.073 0.058 0.974

5⁄8 0.6250 1.197 1.112 0.276 0.488 0.256 0.097 5 0.228 0.207 0.080 0.063 1.086





17


Table 3D Dimensions of Type II Cross Recessed Close Tolerance 100 deg Flat CountersunkHead Machine Screws


Diameter, Penetration Diameter, FBasic Screw Height, Recess Recess Recess Driver Diameter,A Gaging Depth [Note (4)]Diameter H, Ref. Diameter, Depth, Width, Size G

[Note (1)] Max. Min. [Note (2)] M, Ref. T, Ref. N, Ref. [Note (3)] Max. Min. Max. Min. [Note (4)]

4 0.1120 0.212 0.188 0.049 0.131 0.070 0.029 . . . 0.051 0.036 0.025 0.019 0.1676 0.1380 0.262 0.235 0.060 0.157 0.086 0.033 . . . 0.068 0.051 0.028 0.021 0.2148 0.1640 0.312 0.282 0.072 0.185 0.102 0.037 . . . 0.086 0.067 0.031 0.023 0.261

10 0.1900 0.362 0.329 0.083 0.219 0.122 0.042 . . . 0.109 0.087 0.034 0.026 0.307

1⁄4 0.2500 0.477 0.437 0.110 0.288 0.164 0.053 . . . 0.154 0.132 0.040 0.031 0.4155⁄16 0.3125 0.597 0.550 0.138 0.355 0.207 0.063 . . . 0.197 0.175 0.047 0.037 0.526

3⁄8 0.3750 0.717 0.662 0.165 0.433 0.258 0.075 . . . 0.249 0.226 0.053 0.042 0.6387⁄16 0.4375 0.837 0.774 0.193 0.496 0.302 0.085 . . . 0.292 0.269 0.060 0.047 0.750

1⁄2 0.5000 0.957 0.887 0.221 0.555 0.338 0.093 . . . 0.328 0.304 0.066 0.053 0.8629⁄16 0.5625 1.077 1.000 0.249 0.628 0.385 0.104 . . . 0.376 0.352 0.073 0.058 0.974

5⁄8 0.6250 1.197 1.112 0.276 0.687 0.424 0.113 . . . 0.415 0.390 0.080 0.063 1.086



omitted.(2) Tabulated values determined from formula for maximum H in Appendix A.(3) Point same on all drivers.(4) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-


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For

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page

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e4C

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ion

23


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para

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refe

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page

.

NO

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here

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25


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refe

renc

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4DIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

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here

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70.

037

0.10

40.

070

0.06

60

0.03

80.

028

0.06

90.

048

0.17

25

0.12

503 ⁄ 1

60.

237

0.21

50.

075

0.04

10.

116

0.09

10.

106

1R0.

065

0.05

00.

075

0.05

30.

196

60.

1380

3 ⁄ 16

0.26

20.

238

0.08

30.

045

0.12

80.

091

0.10

61R

0.06

50.

050

0.08

00.

057

0.22

08

0.16

401 ⁄ 4

0.31

20.

285

0.10

00.

052

0.15

20.

112

0.12

72R

0.07

50.

060

0.09

10.

066

0.26

7

100.

1900

5 ⁄ 16

0.36

20.

333

0.11

60.

060

0.17

60.

112

0.12

72R

0.07

50.

060

0.10

20.

075

0.31

312

0.21

603 ⁄ 8

0.41

20.

380

0.13

20.

068

0.20

00.

133

0.15

83R

0.09

50.

080

0.11

30.

084

0.36

21 ⁄ 4

0.25

007 ⁄ 1

60.

477

0.44

20.

153

0.07

90.

232

0.13

30.

158

3R0.

095

0.08

00.

129

0.09

50.

424

5 ⁄ 16

0.31

251 ⁄ 2

0.59

70.

556

0.19

10.

099

0.29

00.

191

0.19

44R

0.10

00.

085

0.15

50.

117

0.53

93 ⁄ 8

0.37

509 ⁄ 1

60.

717

0.67

00.

230

0.11

70.

347

0.19

10.

194

4R0.

100

0.08

50.

182

0.13

90.

653

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

4EIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Scr

ews

ofth

ese

leng

ths

and

shor

ter

shal

lha

veun

derc

uthe

ads

assh

own

inTa

ble

6E.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

“R”

inth

ere

cess

size

tabu

lati

onm

eans

regu

lar

dept

hre

cess

.(5

)S

quar

ere

cess

esin

corp

orat

ea

slig

htta

per

onth

esi

des

ofth

ere

cess

.Th

ista

per

can

resu

ltin

loss

ofpe

netr

atio

nga

ging

dept

hon

finis

hed

fast

ener

sdu

eto

the

build

upof

plat

ing

inth

ere

cess

es.

The

rece

sspe

netr

atio

ndi

men

sion

ssp

ecifi

edhe

rear

efo

rfin

ishe

d(p

late

d)pr

oduc

t.M

anuf

actu

rers

shou

ldbe

advi

sed

that

they

shou

ldno

tus

eal

lth

isto

lera

nce

inth

ehe

adin

gpr

oces

s,or

anou

tof

tole

ranc

eco

ndit

ion

coul

dex

ist

afte

rpl

atin

g.(6

)N

oto

lera

nce

for

gagi

ngdi

amet

eris

give

n.If

the

gagi

ngdi

amet

erof

the

gage

used

diff

ers

from

this

tabu

late

dva

lue,

the

prot

rusi

onw

illbe

affe

cted

acco

rdin

gly

and

the

prop

erpr

otru

-si

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

28


Table 5A Dimensions of Slotted Undercut Flat Countersunk Head Machine Screws

ProtrusionNominal SizeHead Head Slot Slot Above Gagingor Basic Gaging

Diameter, Height, Width, Depth, Diameter, FScrew Length, Diameter,A H J T [Note (3)]Diameter L G

[Note (1)] [Note (2)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note (3)]

0 0.0600 1⁄8 0.112 0.096 0.025 0.018 0.023 0.016 0.011 0.007 [Note (4)] [Note (4)] [Note (4)]1 0.0730 1⁄8 0.137 0.120 0.031 0.023 0.026 0.019 0.014 0.009 [Note (4)] [Note (4)] [Note (4)]2 0.0860 1⁄8 0.162 0.144 0.036 0.028 0.031 0.023 0.016 0.011 0.029 0.017 0.1243 0.0990 1⁄8 0.187 0.167 0.042 0.033 0.035 0.027 0.019 0.012 0.031 0.018 0.148

4 0.1120 3⁄16 0.212 0.191 0.047 0.038 0.039 0.031 0.022 0.014 0.032 0.019 0.1725 0.1250 3⁄16 0.237 0.215 0.053 0.043 0.043 0.035 0.024 0.016 0.034 0.020 0.1966 0.1380 3⁄16 0.262 0.238 0.059 0.048 0.048 0.039 0.027 0.017 0.036 0.021 0.220

8 0.1640 1⁄4 0.312 0.285 0.070 0.058 0.054 0.045 0.032 0.021 0.039 0.023 0.26710 0.1900 5⁄16 0.362 0.333 0.081 0.068 0.060 0.050 0.037 0.024 0.042 0.025 0.31312 0.2160 3⁄8 0.412 0.380 0.092 0.078 0.067 0.056 0.043 0.028 0.045 0.027 0.362

1⁄4 0.2500 7⁄16 0.477 0.442 0.107 0.092 0.075 0.064 0.050 0.032 0.050 0.029 0.4245⁄16 0.3125 1⁄2 0.597 0.556 0.134 0.116 0.084 0.072 0.062 0.041 0.057 0.034 0.539

3⁄8 0.3750 9⁄16 0.717 0.670 0.161 0.140 0.094 0.081 0.075 0.049 0.065 0.039 0.6537⁄16 0.4375 5⁄8 0.760 0.715 0.156 0.133 0.094 0.081 0.072 0.045 0.073 0.044 0.690

1⁄2 0.5000 3⁄4 0.815 0.765 0.156 0.130 0.106 0.091 0.072 0.046 0.081 0.049 0.739



omitted.(2) Screws of these lengths and shorter are undercut. Screws of longer lengths shall have head heights as shown in Table

1A.(3) No tolerance for gaging diameter is given. If the gaging diameter of the gage used differs from tabulated value, the pro-



29


Pro

tru

sio

n g

age

L

A G

F

A m

in.

H

MN

T

Th

is t

ype

of

rece

ss h

as a

larg

e

cen

ter

op

enin

g, t

aper

ed w

ing

s,

and

blu

nt

bo

tto

m, w

ith

all

ed

ges

rel

ieve

d o

r ro

un

ded

.

82�

80�

Ed

ge

of

hea

d m

ay

be

rou

nd

ed

or

flat

Tabl

e5B

Dim

ensi

ons

ofTy

peI

Cros

sRe

cess

edU

nder

cut

Flat

Coun

ters

unk

Hea

dM

achi

neS

crew

s

Hea

dH

ead

Rece

ssPr

otru

sion

Abo

veN

omin

alS

ize

Gag

ing

Dia

met

er,

Hei

ght,

Pene

trat

ion

Gag

ing

Dia

met

er,

orB

asic

Scr

ewLe

ngth

,Re

cess

Rece

ssRe

cess

Dia

met

er,

AH

Gag

ing

Dep

thF

[Not

e(3

)]D

iam

eter

LD

iam

eter

,D

epth

,W

idth

,D

rive

rG

[Not

e(1

)][N

ote

(2)]

Max

.M

in.

Max

.M

in.

M,

Ref.

T,Re

f.N

,Re

f.S

ize

Max

.M

in.

Max

.M

in.

[Not

e(3

)]

00.

0600

1 ⁄ 80.

112

0.09

60.

025

0.01

80.

062

0.03

50.

014

00.

036

0.02

0[N

ote

(4)]

[Not

e(4

)][N

ote

(4)]

10.

0730

1 ⁄ 80.

137

0.12

00.

031

0.02

30.

070

0.04

30.

015

00.

044

0.02

8[N

ote

(4)]

[Not

e(4

)][N

ote

(4)]

20.

0860

1 ⁄ 80.

162

0.14

40.

036

0.02

80.

088

0.04

80.

017

10.

049

0.03

30.

029

0.01

70.

124

30.

0990

1 ⁄ 80.

187

0.16

70.

042

0.03

30.

096

0.05

50.

018

10.

056

0.04

00.

031

0.01

80.

148

40.

1120

3 ⁄ 16

0.21

20.

191

0.04

70.

038

0.11

00.

070

0.01

81

0.07

10.

055

0.03

20.

019

0.17

2

50.

1250

3 ⁄ 16

0.23

70.

215

0.05

30.

043

0.12

20.

081

0.01

81

0.08

20.

066

0.03

40.

020

0.19

66

0.13

803 ⁄ 1

60.

262

0.23

80.

059

0.04

80.

140

0.06

60.

025

20.

067

0.04

40.

036

0.02

10.

220

80.

1640

1 ⁄ 40.

312

0.28

50.

070

0.05

80.

168

0.09

40.

029

20.

095

0.07

20.

039

0.02

30.

267

100.

1900

5 ⁄ 16

0.36

20.

333

0.08

10.

068

0.18

20.

110

0.03

02

0.11

00.

087

0.04

20.

025

0.31

312

0.21

603 ⁄ 8

0.41

20.

380

0.09

20.

078

0.22

60.

110

0.03

03

0.10

40.

081

0.04

50.

027

0.36

2

1 ⁄ 40.

2500

7 ⁄ 16

0.47

70.

442

0.10

70.

092

0.24

40.

124

0.03

23

0.11

90.

096

0.05

00.

029

0.42

45 ⁄ 1

60.

3125

1 ⁄ 20.

597

0.55

60.

134

0.11

60.

310

0.15

70.

053

40.

148

0.12

60.

057

0.03

40.

539

3 ⁄ 80.

3750

9 ⁄ 16

0.71

70.

670

0.16

10.

140

0.35

80.

205

0.06

14

0.19

60.

174

0.06

50.

039

0.65

37 ⁄ 1

60.

4375

5 ⁄ 80.

760

0.71

50.

156

0.13

30.

386

0.23

40.

065

40.

225

0.20

30.

073

0.04

40.

690

1 ⁄ 20.

5000

3 ⁄ 40.

815

0.76

50.

156

0.13

00.

402

0.25

20.

068

40.

241

0.21

90.

081

0.04

90.

739

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Scr

ews

ofth

ese

leng

ths

and

shor

ter

are

unde

rcut

.S

crew

sof

long

erle

ngth

ssh

all

have

head

heig

hts

assh

own

inTa

ble

1B.

(3)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.(4

)N

otpr

acti

cal

toga

ge.

30


Pro

tru

sio

n g

age

L

A G

F

A m

in.

HT

82�

80�

Ed

ge

of

hea

d m

ay

be

rou

nd

ed

or

flat

MN

Th

is t

ype

of

rece

ss h

as a

larg

e

cen

ter

op

enin

g, w

ide

stra

igh

t

win

gs,

an

d b

lun

t b

ott

om

, wit

h

all e

dg

es r

elie

ved

or

rou

nd

ed.

Tabl

e5C

Dim

ensi

ons

ofTy

peIA

Cros

sRe

cess

edU

nder

cut

Flat

Coun

ters

unk

Hea

dM

achi

neS

crew

s

Hea

dH

ead

Rece

ssPr

otru

sion

Abo

veN

omin

alS

ize

Gag

ing

Dia

met

er,

Hei

ght,

Pene

trat

ion

Gag

ing

Dia

met

er,

orB

asic

Scr

ewLe

ngth

,Re

cess

Rece

ssRe

cess

Dia

met

er,

AH

Gag

ing

Dep

thF

[Not

e(3

)]D

iam

eter

LD

iam

eter

,D

epth

,W

idth

,D

rive

rG

[Not

e(1

)][N

ote

(2)]

Max

.M

in.

Max

.M

in.

M,

Ref.

T,Re

f.N

,Re

f.S

ize

Max

.M

in.

Max

.M

in.

[Not

e(3

)]

00.

0600

1 ⁄ 80.

112

0.09

60.

025

0.01

80.

062

0.03

60.

018

00.

037

0.02

1[N

ote

(4)]

[Not

e(4

)][N

ote

(4)]

10.

0730

1 ⁄ 80.

137

0.12

00.

031

0.02

30.

070

0.04

40.

018

00.

045

0.02

9[N

ote

(4)]

[Not

e(4

)][N

ote

(4)]

20.

0860

1 ⁄ 80.

162

0.14

40.

036

0.02

80.

088

0.04

80.

028

10.

046

0.03

00.

029

0.01

70.

124

30.

0990

1 ⁄ 80.

187

0.16

70.

042

0.03

30.

096

0.05

50.

029

10.

053

0.03

70.

031

0.01

80.

148

40.

1120

3 ⁄ 16

0.21

20.

191

0.04

70.

038

0.11

00.

070

0.02

91

0.06

80.

052

0.03

20.

019

0.17

2

50.

1250

3 ⁄ 16

0.23

70.

215

0.05

30.

043

0.12

20.

081

0.03

01

0.07

90.

063

0.03

40.

020

0.19

66

0.13

803 ⁄ 1

60.

262

0.23

80.

059

0.04

80.

140

0.06

90.

040

20.

063

0.04

50.

036

0.02

10.

220

80.

1640

1 ⁄ 40.

312

0.28

50.

070

0.05

80.

168

0.09

80.

041

20.

091

0.07

30.

039

0.02

30.

267

100.

1900

5 ⁄ 16

0.36

20.

333

0.08

10.

068

0.18

20.

112

0.04

12

0.10

70.

089

0.04

20.

025

0.31

312

0.21

603 ⁄ 8

0.41

20.

380

0.09

20.

078

0.22

60.

112

0.05

53

0.10

00.

082

0.04

50.

027

0.36

2

1 ⁄ 40.

2500

7 ⁄ 16

0.47

70.

442

0.10

70.

092

0.24

20.

128

0.05

63

0.11

50.

097

0.05

00.

029

0.42

45 ⁄ 1

60.

3125

1 ⁄ 20.

597

0.55

60.

134

0.11

60.

310

0.16

30.

085

40.

145

0.12

70.

057

0.03

40.

539

3 ⁄ 80.

3750

9 ⁄ 16

0.71

70.

670

0.16

10.

140

0.35

80.

211

0.08

64

0.19

30.

175

0.06

50.

039

0.65

37 ⁄ 1

60.

4375

5 ⁄ 80.

760

0.71

50.

156

0.13

30.

386

0.23

90.

086

40.

222

0.20

40.

073

0.04

40.

690

1 ⁄ 20.

5000

3 ⁄ 40.

815

0.76

50.

156

0.13

00.

402

0.25

60.

086

40.

238

0.22

00.

081

0.04

90.

739

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Scr

ews

ofth

ese

leng

ths

and

shor

ter

are

unde

rcut

.S

crew

sof

long

erle

ngth

ssh

all

have

head

heig

hts

assh

own

inTa

ble

1C.

(3)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.(4

)N

otpr

acti

cal

toga

ge.

31


Pro

tru

sio

n g

age

L

A G

F

A m

in.

HT

82�

80�

Ed

ge

of

hea

d m

ay

be

rou

nd

ed

or

flat

MN

Th

is t

ype

of

rece

ss c

on

sist

s o

f

two

inte

rsec

tin

g s

lots

wit

h

par

alle

l sid

es c

on

verg

ing

to

a

slig

htl

y tr

un

cate

d a

pex

at

b

ott

om

of

rece

ss.

Tabl

e5D

Dim

ensi

ons

ofTy

peII

Cros

sRe

cess

edU

nder

cut

Flat

Coun

ters

unk

Hea

dM

achi

neSc

rew

s

Hea

dH

ead

Prot

rusi

onA

bove

Nom

inal

Siz

eG

agin

gD

iam

eter

,H

eigh

t,Re

cess

Pene

trat

ion

Gag

ing

Dia

met

er,

orB

asic

Scr

ewLe

ngth

,Re

cess

Rece

ssRe

cess

Dri

ver

Dia

met

er,

AH

Gag

ing

Dep

thF

[Not

e(4

)]D

iam

eter

LD

iam

eter

,D

epth

,W

idth

,S

ize

G[N

ote

(1)]

[Not

e(2

)]M

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ifyi

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min

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mal

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edin

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thde

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ter

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ers

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32


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ppen

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I.

33


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ra.

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TES

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ifyi

ngno

min

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mal

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ros

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edin

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cim

alan

din

the

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Tabu

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I.

34


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e

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nt

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ith

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ieve

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ded

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ge

of

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ay b

e

flat

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nd

ed

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tru

sio

n g

age

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F

G

(see

par

a. 2

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M

N

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e6B

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084

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70.

070

0.06

60

0.03

80.

028

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90.

048

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237

0.21

50.

053

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094

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091

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0.06

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66

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262

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0.04

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104

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091

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0.06

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057

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0.31

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285

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052

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101

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127

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267

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1900

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333

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060

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118

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127

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00.

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50.

313

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2160

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0.38

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161

0.13

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133

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83R

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080

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084

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477

0.44

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107

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90.

186

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133

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45 ⁄ 1

60.

3125

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0.55

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134

0.09

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232

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80.

191

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44R

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00.

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717

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70.

278

0.23

90.

191

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00.

085

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139

0.65

3

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Scr

ews

ofth

ese

leng

ths

and

shor

ter

shal

lha

veun

derc

uthe

ads.

Scr

ews

oflo

nger

leng

ths

shal

lha

vehe

adhe

ight

sas

show

nin

Tabl

e4E

.(3

)Ta

bula

ted

valu

esde

term

ined

from

form

ula

for

max

imum

Hin

App

endi

xA

.(4

)“R

”in

the

rece

sssi

zeta

bula

tion

mea

nsre

gula

rde

pth

rece

ss.

(5)

Squ

are

rece

sses

inco

rpor

ate

asl

ight

tape

ron

the

side

sof

the

rece

ss.

This

tape

rca

nre

sult

inlo

ssof

pene

trat

ion

gagi

ngde

pth

onfin

ishe

dfa

sten

ers

due

toth

ebu

ildup

ofpl

atin

gin

the

rece

sses

.Th

ere

cess

pene

trat

ion

dim

ensi

ons

spec

ified

here

are

for

finis

hed

(pla

ted)

prod

uct.

Man

ufac

ture

rssh

ould

bead

vise

dth

atth

eysh

ould

not

use

all

this

tole

ranc

ein

the

head

ing

proc

ess,

oran

out

ofto

lera

nce

cond

itio

nco

uld

exis

taf

ter

plat

ing.

(6)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omth

ista

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

y,an

dth

epr

oper

prot

ru-

sion

valu

esm

ust

bere

calc

ulat

edus

ing

the

form

ulas

show

nin

App

endi

xI.

38


Tabl

e7A

Illus

trat

ion

39


Tabl

e7A

Dim

ensi

ons

ofTy

peI

Cros

sRe

cess

edFl

atCo

unte

rsun

kTr

imH

ead

Mac

hine

Scre

ws

Prot

rusi

onA

bove

Nom

inal

Siz

eS

houl

der

Hea

dRe

cess

Gag

ing

orB

asic

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dG

agin

gD

iam

eter

,D

iam

eter

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netr

atio

nD

iam

eter

,F

Scr

ewH

eigh

t,Re

cess

Rece

ssRe

cess

Dia

met

er,

EA

Gag

ing

Dep

th[N

ote

(4)]

Dia

met

erH

ead

H,

Ref.

Dia

met

er,

Dep

th,

Wid

th,

Dri

ver

G[N

ote

(2)]

Siz

eM

ax.

Min

.M

ax.

Min

.[N

ote

(3)]

M,

Ref.

T,Re

f.N

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f.S

ize

Max

.M

in.

Max

.M

in.

[Not

e(4

)]

40.

1120

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112

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187

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052

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00.

060

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81

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045

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018

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119

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191

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122

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1380

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138

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212

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052

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131

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215

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196

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164

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1900

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190

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312

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110

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285

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2500

100.

250

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124

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240

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380

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262

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035

30.

139

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045

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70.

362

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302

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380

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262

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40.

035

30.

139

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60.

045

0.02

70.

362

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302

0.47

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442

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276

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00.

036

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154

0.13

10.

050

0.02

90.

424

3 ⁄ 80.

3750

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0.37

50.

364

0.59

70.

556

0.15

50.

358

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50.

061

40.

196

0.17

40.

057

0.03

40.

539

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

7AIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

40


Tabl

e7B

Illus

trat

ion

41


Tabl

e7B

Dim

ensi

ons

ofTy

peIA

Cros

sRe

cess

edFl

atCo

unte

rsun

kTr

imH

ead

Mac

hine

Scre

ws Pr

otru

sion

Abo

veN

omin

alS

ize

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ulde

rH

ead

Rece

ssG

agin

gor

Bas

icH

ead

Gag

ing

Dia

met

er,

Dia

met

er,

Pene

trat

ion

Dia

met

er,

FS

crew

Hei

ght,

Rece

ssRe

cess

Rece

ssD

iam

eter

,E

AG

agin

gD

epth

[Not

e(4

)]D

iam

eter

Hea

dH

,Re

f.D

iam

eter

,D

epth

,W

idth

,D

rive

rG

[Not

e(2

)]S

ize

Max

.M

in.

Max

.M

in.

[Not

e(3

)]M

,Re

f.T,

Ref.

N,

Ref.

Siz

eM

ax.

Min

.M

ax.

Min

.[N

ote

(4)]

40.

1120

30.

112

0.10

60.

187

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70.

052

0.10

00.

060

0.02

91

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80.

042

0.03

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018

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85

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119

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191

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122

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10.

030

10.

079

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30.

032

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90.

172

60.

1380

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138

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10.

212

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052

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20.

081

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01

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063

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019

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131

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215

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148

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196

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1640

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164

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237

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052

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0.04

12

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10.

063

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68

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406

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40.

157

0.26

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238

0.06

90.

176

0.10

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099

0.08

10.

036

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10.

220

100.

1900

80.

190

0.18

10.

312

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50.

085

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112

0.04

12

0.10

70.

089

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90.

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712

0.21

608

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60.

207

0.31

20.

285

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90.

192

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041

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117

0.09

90.

039

0.02

30.

267

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2160

100.

216

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70.

362

0.33

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101

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80.

127

0.04

12

0.12

20.

104

0.04

20.

025

0.31

3

1 ⁄ 40.

2500

100.

250

0.24

00.

362

0.33

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080

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80.

127

0.04

12

0.12

20.

104

0.04

20.

025

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31 ⁄ 4

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00.

240

0.41

20.

380

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20.

262

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90.

056

30.

136

0.11

80.

045

0.02

70.

362

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0.31

20.

302

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20.

380

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50.

262

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90.

056

30.

136

0.11

80.

045

0.02

70.

362

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302

0.47

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442

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60.

276

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40.

057

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151

0.13

30.

050

0.02

90.

424

3 ⁄ 80.

3750

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0.37

50.

364

0.59

70.

556

0.15

50.

358

0.21

10.

086

40.

193

0.17

50.

057

0.03

40.

539

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

7BIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

42


Tabl

e7C

Illus

trat

ion

43


Tabl

e7C

Dim

ensi

ons

ofTy

peII

Cros

sRe

cess

edFl

atCo

unte

rsun

kTr

imH

ead

Mac

hine

Scre

ws

Prot

rusi

onN

omin

alS

ize

Sho

ulde

rH

ead

Rece

ssA

bove

Gag

ing

orB

asic

Hea

dG

agin

gD

iam

eter

,D

iam

eter

,Pe

netr

atio

nD

iam

eter

,F

Scr

ewH

eigh

t,Re

cess

Rece

ssRe

cess

Dri

ver

Dia

met

er,

EA

Gag

ing

Dep

th[N

ote

(5)]

Dia

met

erH

ead

H,

Ref.

Dia

met

er,

Dep

th,

Wid

th,

Siz

eG

[Not

e(2

)]S

ize

Max

.M

in.

Max

.M

in.

[Not

e(3

)]M

,Re

f.T,

Ref.

N,

Ref.

[Not

e(4

)]M

ax.

Min

.M

ax.

Min

.[N

ote

(5)]

40.

1120

30.

112

0.10

60.

187

0.16

70.

052

0.13

30.

072

0.03

0..

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053

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031

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80.

148

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1250

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125

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212

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082

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20.

032

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90.

172

60.

1380

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138

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212

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10.

052

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172

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138

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094

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.0.

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034

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00.

196

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237

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0.41

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297

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...

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25 ⁄ 1

60.

3125

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312

0.30

20.

477

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116

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195

0.06

1..

.0.

193

0.17

60.

050

0.02

90.

424

3 ⁄ 80.

3750

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0.37

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364

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556

0.15

50.

432

0.25

20.

074

...

0.25

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232

0.05

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034

0.53

9

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

7CIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

Poin

tsa

me

onal

ldr

iver

s.(5

)N

oto

lera

nce

for

gagi

ngdi

amet

eris

give

n.If

the

gagi

ngdi

amet

erof

the

gage

used

diff

ers

from

tabu

late

dva

lue,

the

prot

rusi

onw

illbe

affe

cted

acco

rdin

gly

and

the

prop

erpr

otru

sion

valu

esm

ust

bere

calc

ulat

edus

ing

the

form

ulas

show

nin

App

endi

xI.

44


L L o

H

T O

82�

80�

Th

is t

ype

of

rece

ss h

as a

larg

e

cen

ter

op

enin

g, t

aper

ed w

ing

s,

and

blu

nt

bo

tto

m, w

ith

all

ed

ges

rel

ieve

d o

r ro

un

ded

.

Pro

tru

sio

n

gag

e

A

F

G

(see

par

a. 2

.2)

M

N

AC

Sh

ort

Scre

ws

[No

te (

1)]

E0.06

2 m

in.

Lo

ng

Scre

ws W

ith

Re

du

ce

d B

od

y a

nd

Sh

ou

lde

r

R

Tabl

e8A

Dim

ensi

ons

ofTy

peI

Cros

sR

eces

sed

Ova

lCo

unte

rsun

kTr

imH

ead

Mac

hine

Scr

ews

Prot

rusi

onN

omin

alS

ize

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dTo

tal

Sho

ulde

rH

ead

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ssA

bove

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ing

orB

asic

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eH

ead

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dG

agin

gD

iam

eter

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iam

eter

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atio

nD

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ewH

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t,Cr

own

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ght,

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cess

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ssRe

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er,

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ing

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th[N

ote

(5)]

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erH

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ght,

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ius,

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met

er,

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th,

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th,

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ver

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ote

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ote

(3)]

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f.[N

ote

(4)]

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f.M

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f.T,

Ref.

N,

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eM

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ax.

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.[N

ote

(5)]

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Sho

rtS

crew

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ote

(1)]

40.

1120

3..

...

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118

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10.

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148

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112

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152

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1900

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102

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313

45


Tabl

e8A

Dim

ensi

ons

ofTy

peI

Cros

sRe

cess

edO

val

Coun

ters

unk

Trim

Hea

dM

achi

neSc

rew

s(C

ont’

d)

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rusi

onN

omin

alS

ize

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dTo

tal

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ulde

rH

ead

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ssA

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ing

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asic

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eH

ead

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dG

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gD

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eter

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eter

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netr

atio

nD

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eter

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Scr

ewH

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t,Cr

own

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ght,

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cess

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cess

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met

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ing

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th[N

ote

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ius,

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th,

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th,

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ver

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ote

(2)]

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ote

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ote

(4)]

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ax.

Min

.[N

ote

(5)]

For

Sho

rtS

crew

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ote

(1)]

(Con

t’d)

1 ⁄ 40.

2500

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...

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00.

146

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202

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50.

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102

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50.

313

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2500

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30.

264

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033

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140

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111

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25 ⁄ 1

60.

3125

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...

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130

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202

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80.

284

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040

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156

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129

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424

3 ⁄ 80.

3750

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...

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099

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54

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117

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9

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Long

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ews

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der

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112

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118

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164

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117

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188

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110

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220

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190

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312

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141

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124

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267

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216

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312

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091

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214

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033

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102

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313

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2500

100.

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2500

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250

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124

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80.

187

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135

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20.

302

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380

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00.

033

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140

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50.

111

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25 ⁄ 1

60.

3125

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312

0.30

20.

477

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20.

130

0.07

90.

202

0.03

80.

284

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00.

040

30.

156

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10.

129

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50.

424

3 ⁄ 80.

3750

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0.37

50.

364

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70.

556

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30.

099

0.26

50.

048

0.38

40.

226

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54

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80.

194

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50.

117

0.53

9

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umO

inA

ppen

dix

A.

(5)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

46


H

T

Pro

tru

sio

n

gag

e

A

F

G

Sh

ort

Scre

ws

[No

te (

1)]

E0.06

2 m

in.

Lo

ng

Scre

ws W

ith

Red

uced

Bo

dy a

nd

Sh

ou

lder

R

M

N

Th

is t

ype

of

rece

ss h

as a

larg

e

cen

ter

op

enin

g, w

ide

stra

igh

t

win

gs,

an

d b

lun

t b

ott

om

, wit

h

all e

dg

es r

elie

ved

or

rou

nd

ed.

AL L o

O

82�

80�

(see

par

a. 2

.2)

C

Tabl

e8B

Dim

ensi

ons

ofTy

peIA

Cros

sRe

cess

edO

val

Coun

ters

unk

Trim

Hea

dM

achi

neSc

rew

s

Prot

rusi

onN

omin

alS

ize

Hea

dTo

tal

Sho

ulde

rH

ead

Rece

ssA

bove

Gag

ing

orB

asic

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eH

ead

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dG

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gD

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eter

,D

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nD

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dRe

cess

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ssRe

cess

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met

er,

EA

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ing

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th[N

ote

(5)]

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met

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ead

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ght,

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ius,

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met

er,

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th,

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th,

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ver

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ote

(2)]

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.M

ax.

Min

.[N

ote

(3)]

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f.[N

ote

(4)]

R,Re

f.M

,Re

f.T,

Ref.

N,

Ref.

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eM

ax.

Min

.M

ax.

Min

.[N

ote

(5)]

For

Sho

rtS

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ote

(1)]

40.

1120

3..

...

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187

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057

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40.

118

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030

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074

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102

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313

47


Tabl

e8B

Dim

ensi

ons

ofTy

peIA

Cros

sRe

cess

edO

val

Coun

ters

unk

Trim

Hea

dM

achi

neSc

rew

s(C

ont’

d)

Prot

rusi

onN

omin

alS

ize

Hea

dTo

tal

Sho

ulde

rH

ead

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ssA

bove

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ing

orB

asic

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eH

ead

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dG

agin

gD

iam

eter

,D

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eter

,Pe

netr

atio

nD

iam

eter

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ewH

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own

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dRe

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met

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ing

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ote

(5)]

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ght,

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ius,

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th,

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ver

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ote

(2)]

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eM

ax.

Min

.M

ax.

Min

.[N

ote

(3)]

C,Re

f.[N

ote

(4)]

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f.M

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f.T,

Ref.

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ax.

Min

.[N

ote

(5)]

For

Sho

rtS

crew

s[N

ote

(1)]

(Con

t’d)

1 ⁄ 40.

2500

10..

...

.0.

362

0.33

30.

091

0.06

00.

146

0.02

90.

202

0.13

20.

041

20.

125

0.10

70.

102

0.07

50.

313

1 ⁄ 40.

2500

12..

...

.0.

412

0.38

00.

124

0.06

80.

187

0.03

30.

264

0.14

80.

056

30.

135

0.11

70.

113

0.08

40.

362

5 ⁄ 16

0.31

2512

...

...

0.41

20.

380

0.08

70.

068

0.15

00.

033

0.26

40.

148

0.05

63

0.13

50.

117

0.11

30.

084

0.36

25 ⁄ 1

60.

3125

1 ⁄ 4..

...

.0.

477

0.44

20.

130

0.07

90.

202

0.03

80.

284

0.16

80.

057

30.

155

0.13

70.

129

0.09

50.

424

3 ⁄ 80.

3750

5 ⁄ 16

...

...

0.59

70.

556

0.17

30.

099

0.26

50.

048

0.38

40.

232

0.08

64

0.21

50.

197

0.15

50.

117

0.53

9

For

Long

Scr

ews

Wit

hS

houl

der

40.

1120

30.

112

0.10

60.

187

0.16

70.

057

0.03

30.

086

0.01

40.

118

0.07

70.

030

10.

074

0.05

80.

064

0.04

40.

148

50.

1250

40.

125

0.11

90.

212

0.19

10.

066

0.03

70.

099

0.01

70.

130

0.08

90.

030

10.

086

0.07

00.

069

0.04

80.

172

60.

1380

40.

138

0.13

10.

212

0.19

10.

058

0.03

70.

091

0.01

70.

130

0.08

90.

030

10.

086

0.07

00.

069

0.04

80.

172

60.

1380

50.

138

0.13

10.

237

0.21

50.

075

0.04

10.

112

0.01

90.

162

0.09

10.

041

20.

084

0.06

60.

075

0.05

30.

196

80.

1640

50.

164

0.15

70.

237

0.21

50.

060

0.04

10.

096

0.01

90.

162

0.09

10.

041

20.

084

0.06

60.

075

0.05

30.

196

80.

1640

60.

164

0.15

70.

262

0.23

80.

076

0.04

50.

117

0.02

10.

188

0.11

70.

041

20.

109

0.09

10.

080

0.05

70.

220

100.

1900

80.

190

0.18

10.

312

0.28

50.

094

0.07

60.

141

0.02

50.

200

0.13

00.

041

20.

122

0.10

40.

091

0.06

60.

267

120.

2160

80.

216

0.20

70.

312

0.28

50.

078

0.07

60.

125

0.02

50.

200

0.13

00.

041

20.

122

0.10

40.

091

0.06

60.

267

120.

2160

100.

216

0.20

70.

362

0.33

30.

111

0.06

00.

166

0.02

90.

214

0.14

30.

041

20.

136

0.11

80.

102

0.07

50.

313

1 ⁄ 40.

2500

100.

250

0.24

00.

362

0.33

30.

091

0.06

00.

146

0.02

90.

214

0.14

30.

041

20.

136

0.11

80.

102

0.07

50.

313

1 ⁄ 40.

2500

120.

250

0.24

00.

412

0.38

00.

124

0.06

80.

187

0.03

30.

264

0.14

80.

056

30.

135

0.11

70.

113

0.08

40.

362

5 ⁄ 16

0.31

2512

0.31

20.

302

0.41

20.

380

0.08

70.

068

0.15

00.

033

0.26

40.

148

0.05

63

0.13

50.

117

0.11

30.

084

0.36

25 ⁄ 1

60.

3125

1 ⁄ 40.

312

0.30

20.

477

0.44

20.

130

0.07

90.

202

0.03

80.

284

0.16

80.

057

30.

155

0.13

70.

129

0.09

50.

424

3 ⁄ 80.

3750

5 ⁄ 16

0.37

50.

364

0.59

70.

556

0.17

30.

099

0.26

50.

048

0.38

40.

232

0.08

64

0.21

50.

197

0.15

50.

117

0.53

9

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umO

inA

ppen

dix

A.

(5)

No

tole

ranc

efo

rga

ging

diam

eter

isgi

ven.

Ifth

ega

ging

diam

eter

ofth

ega

geus

eddi

ffer

sfr

omta

bula

ted

valu

e,th

epr

otru

sion

will

beaf

fect

edac

cord

ingl

yan

dth

epr

oper

prot

rusi

onva

lues

mus

tbe

reca

lcul

ated

usin

gth

efo

rmul

assh

own

inA

ppen

dix

I.

48


Tabl

e8C

Illus

trat

ion

49


Tabl

e8C

Dim

ensi

ons

ofTy

peII

Cros

sRe

cess

edO

val

Coun

ters

unk

Trim

Hea

dM

achi

neSc

rew

s

Prot

rusi

onN

omin

alS

ize

Hea

dTo

tal

Sho

ulde

rH

ead

Rece

ssA

bove

Gag

ing

orS

ide

Hea

dH

ead

Gag

ing

Dia

met

er,

Dia

met

er,

Pene

trat

ion

Dia

met

er,

FB

asic

Scr

ewH

eigh

t,Cr

own

Hei

ght,

Hea

dRe

cess

Rece

ssRe

cess

Dri

ver

Dia

met

er,

EA

Gag

ing

Dep

th[N

ote

(6)]

Dia

met

erH

ead

H,

Ref.

Hei

ght,

O,

Ref.

Rad

ius,

Dia

met

er,

Dep

th,

Wid

th,

Siz

eG

[Not

e(2

)]S

ize

Max

.M

in.

Max

.M

in.

[Not

e(3

)]C,

Ref.

[Not

e(4

)]R,

Ref.

M,

Ref.

T,Re

f.N

,Re

f.[N

ote

(5)]

Max

.M

in.

Max

.M

in.

[Not

e(6

)]

40.

1120

30.

112

0.10

60.

187

0.16

70.

057

0.03

30.

086

0.01

40.

133

0.07

20.

030

...

0.05

30.

041

0.06

40.

044

0.14

85

0.12

504

0.12

50.

119

0.21

20.

191

0.06

60.

037

0.09

90.

017

0.15

10.

082

0.03

2..

.0.

064

0.05

20.

069

0.04

80.

172

60.

1380

40.

138

0.13

10.

212

0.19

10.

058

0.03

70.

091

0.01

70.

151

0.08

20.

032

...

0.06

40.

052

0.06

90.

048

0.17

26

0.13

805

0.13

80.

131

0.23

70.

215

0.07

50.

041

0.11

20.

019

0.16

90.

094

0.03

5..

.0.

077

0.06

40.

075

0.05

30.

196

80.

1640

50.

164

0.15

70.

237

0.21

50.

060

0.04

10.

096

0.01

90.

169

0.09

40.

035

...

0.07

70.

064

0.07

50.

053

0.19

68

0.16

406

0.16

40.

157

0.26

20.

238

0.07

60.

045

0.11

70.

021

0.18

80.

106

0.03

8..

.0.

089

0.07

50.

080

0.05

70.

220

100.

1900

80.

190

0.18

10.

312

0.28

50.

094

0.07

60.

141

0.02

50.

224

0.12

40.

043

...

0.11

30.

099

0.09

10.

066

0.26

712

0.21

608

0.21

60.

207

0.31

20.

285

0.07

80.

076

0.12

50.

025

0.22

40.

124

0.04

3..

.0.

113

0.09

90.

091

0.06

60.

267

120.

2160

100.

216

0.20

70.

362

0.33

30.

111

0.06

00.

166

0.02

90.

260

0.14

80.

048

...

0.13

70.

122

0.10

20.

075

0.31

3

1 ⁄ 40.

2500

100.

250

0.24

00.

362

0.33

30.

091

0.06

00.

146

0.02

90.

260

0.14

80.

048

...

0.13

70.

122

0.10

20.

075

0.31

31 ⁄ 4

0.25

0012

0.25

00.

240

0.41

20.

380

0.12

40.

068

0.18

70.

033

0.29

70.

172

0.05

4..

.0.

162

0.14

50.

113

0.08

40.

362

5 ⁄ 16

0.31

2512

0.31

20.

302

0.41

20.

380

0.08

70.

068

0.15

00.

033

0.29

70.

172

0.05

4..

.0.

162

0.14

50.

113

0.08

40.

362

5 ⁄ 16

0.31

251 ⁄ 4

0.31

20.

302

0.47

70.

442

0.13

00.

079

0.20

20.

038

0.34

40.

195

0.06

1..

.0.

193

0.17

60.

129

0.09

50.

424

3 ⁄ 80.

3750

5 ⁄ 16

0.37

50.

364

0.59

70.

556

0.17

30.

099

0.26

50.

048

0.43

20.

252

0.07

4..

.0.

251

0.23

20.

155

0.11

70.

539

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

8CIll

ustr

atio

non

prev

ious

page

.

NO

TES

:(1

)S

hort

scre

ws

incl

ude

nom

inal

leng

ths

upto

and

incl

udin

g11 ⁄ 8

in.

for

size

sN

o.5

and

smal

ler,

and

2in

.fo

rsi

zes

No.

6an

dla

rger

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umH

inA

ppen

dix

A.

(4)

Tabu

late

dva

lues

dete

rmin

edfr

omfo

rmul

afo

rm

axim

umO

inA

ppen

dix

A.

(5)

Poin

tsa

me

onal

ldr

iver

s.(6

)N

oto

lera

nce

for

gagi

ngdi

amet

eris

give

n.If

the

gagi

ngdi

amet

erof

the

gage

used

diff

ers

from

tabu

late

dva

lue,

the

prot

rusi

onw

illbe

affe

cted

acco

rdin

gly

and

the

prop

erpr

otru

sion

valu

esm

ust

bere

calc

ulat

edus

ing

the

form

ulas

show

nin

App

endi

xI.

50


Table 9A Dimensions of Slotted Pan Head Machine Screws

HeadNominal Size HeadDiameter, Head Height, Slot Width, Slot Depth,or Basic Screw Radius,

A H J TDiameter R,[Note (1)] Max. Min. Max. Min. Max. Max. Min. Max. Min.

0000 0.0210 0.042 0.036 0.016 0.010 0.007 0.008 0.004 0.008 0.004000 0.0340 0.066 0.060 0.023 0.017 0.010 0.012 0.008 0.012 0.008

00 0.0470 0.090 0.082 0.032 0.025 0.015 0.017 0.010 0.016 0.010

0 0.0600 0.116 0.104 0.039 0.031 0.020 0.023 0.016 0.022 0.0141 0.0730 0.142 0.130 0.046 0.038 0.025 0.026 0.019 0.027 0.0182 0.0860 0.167 0.155 0.053 0.045 0.035 0.031 0.023 0.031 0.0223 0.0990 0.193 0.180 0.060 0.051 0.037 0.035 0.027 0.036 0.026

4 0.1120 0.219 0.205 0.068 0.058 0.042 0.039 0.031 0.040 0.0305 0.1250 0.245 0.231 0.075 0.065 0.044 0.043 0.035 0.045 0.0346 0.1380 0.270 0.256 0.082 0.072 0.046 0.048 0.039 0.050 0.037

8 0.1640 0.322 0.306 0.096 0.085 0.052 0.054 0.045 0.058 0.04510 0.1900 0.373 0.357 0.110 0.099 0.061 0.060 0.050 0.068 0.05312 0.2160 0.425 0.407 0.125 0.112 0.078 0.067 0.056 0.077 0.061

1⁄4 0.2500 0.492 0.473 0.144 0.130 0.087 0.075 0.064 0.087 0.0705⁄16 0.3125 0.615 0.594 0.178 0.162 0.099 0.084 0.072 0.106 0.085

3⁄8 0.3750 0.740 0.716 0.212 0.195 0.143 0.094 0.081 0.124 0.1007⁄16 0.4375 0.863 0.837 0.247 0.228 0.153 0.094 0.081 0.142 0.116

1⁄2 0.5000 0.987 0.958 0.281 0.260 0.175 0.106 0.091 0.161 0.1319⁄16 0.5625 1.041 1.000 0.315 0.293 0.197 0.118 0.102 0.179 0.146

5⁄8 0.6250 1.172 1.125 0.350 0.325 0.219 0.133 0.116 0.197 0.1623⁄4 0.7500 1.435 1.375 0.419 0.390 0.263 0.149 0.131 0.234 0.192


NOTE:(1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.

51


Table 9B Dimensions of Type I Cross Recessed Pan Head Machine Screws

Head Head RecessNominal SizeDiameter, Height, Penetrationor Basic Screw Head Recess Recess Recess

A H Gaging DepthDiameter Radius, Diameter, Depth, Width, Driver[Note (1)] Max. Min. Max. Min. R, Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.116 0.104 0.044 0.036 0.005 0.060 0.030 0.013 0 0.032 0.0141 0.0730 0.142 0.130 0.053 0.044 0.005 0.067 0.035 0.014 0 0.040 0.0222 0.0860 0.167 0.155 0.062 0.053 0.010 0.097 0.050 0.017 1 0.052 0.0343 0.0990 0.193 0.180 0.071 0.062 0.010 0.105 0.059 0.019 1 0.061 0.043

4 0.1120 0.219 0.205 0.080 0.070 0.010 0.115 0.069 0.019 1 0.071 0.0535 0.1250 0.245 0.231 0.089 0.079 0.015 0.152 0.070 0.028 2 0.072 0.0466 0.1380 0.270 0.256 0.097 0.087 0.015 0.159 0.078 0.028 2 0.080 0.055

8 0.1640 0.322 0.306 0.115 0.105 0.015 0.175 0.095 0.030 2 0.097 0.07110 0.1900 0.373 0.357 0.133 0.122 0.020 0.192 0.112 0.031 2 0.113 0.08912 0.2160 0.425 0.407 0.151 0.139 0.025 0.252 0.128 0.034 3 0.124 0.098

1⁄4 0.2500 0.492 0.473 0.175 0.162 0.035 0.274 0.148 0.036 3 0.144 0.1185⁄16 0.3125 0.615 0.594 0.218 0.203 0.040 0.343 0.181 0.059 4 0.173 0.149

3⁄8 0.3750 0.740 0.716 0.261 0.244 0.040 0.382 0.221 0.065 4 0.213 0.1907⁄16 0.4375 0.863 0.837 0.305 0.284 0.050 0.406 0.246 0.068 4 0.239 0.214

1⁄2 0.5000 0.987 0.958 0.348 0.325 0.055 0.428 0.267 0.071 4 0.260 0.2359⁄16 0.5625 1.041 1.000 0.391 0.366 0.065 0.458 0.300 0.076 4 0.292 0.268

5⁄8 0.6250 1.172 1.125 0.434 0.406 0.075 0.575 0.328 0.081 5 0.310 0.2813⁄4 0.7500 1.435 1.375 0.521 0.488 0.085 0.621 0.368 0.086 5 0.349 0.322



omitted.

52


M

W

N

Th

is t

ype

of

rece

ss h

as a

larg

ece

nte

r o

pen

ing

, tap

ered

win

gs,

and

a b

lun

t b

ott

om

, wit

h t

op

edg

es r

elie

ved

or

rou

nd

ed.

A s

lot

run

s p

aral

lel t

o o

ne

pai

r o

f re

cess

win

gs.

AD

T

R

HL

Tabl

e9C

Dim

ensi

ons

ofCo

mbi

nati

onS

lott

ed—

Type

ICr

oss

Rece

ssed

Pan

Hea

dM

achi

neS

crew

s

Rece

ssH

ead

Pene

trat

ion

Nom

inal

Siz

eD

iam

eter

,H

ead

Hei

ght,

Slo

tW

idth

,S

lot

Dep

th,

Gag

ing

Dep

th,

orB

asic

Scr

ewH

ead

Rece

ssRe

cess

Rece

ssA

HW

D[N

ote

(2)]

PD

iam

eter

Rad

ius,

Dia

met

er,

Dep

th,

Wid

th,

Dri

ver

[Not

e(1

)]M

ax.

Min

.M

ax.

Min

.R,

Min

.M

ax.

Min

.M

ax.

Min

.M

,Re

f.T,

Ref.

N,

Ref.

Siz

eM

ax.

Min

.

00.

0600

0.11

60.

104

0.04

40.

036

0.00

50.

023

0.01

60.

022

0.01

30.

060

0.03

00.

013

00.

032

0.01

41

0.07

300.

142

0.13

00.

053

0.04

40.

005

0.02

60.

019

0.02

70.

016

0.06

70.

035

0.01

40

0.04

00.

022

20.

0860

0.16

70.

155

0.06

20.

053

0.01

00.

031

0.02

30.

031

0.02

00.

097

0.05

00.

017

10.

052

0.03

43

0.09

900.

193

0.18

00.

071

0.06

20.

010

0.03

50.

027

0.03

60.

023

0.10

50.

059

0.01

91

0.06

10.

043

40.

1120

0.21

90.

205

0.08

00.

070

0.01

00.

039

0.03

10.

040

0.02

70.

115

0.06

90.

019

10.

071

0.05

3

50.

1250

0.24

50.

231

0.08

90.

079

0.01

50.

043

0.03

50.

045

0.03

00.

152

0.07

00.

028

20.

072

0.04

66

0.13

800.

270

0.25

60.

097

0.08

70.

015

0.04

80.

039

0.05

00.

033

0.15

90.

078

0.02

82

0.08

00.

055

80.

1640

0.32

20.

306

0.11

50.

105

0.01

50.

054

0.04

50.

058

0.04

10.

175

0.09

50.

030

20.

097

0.07

110

0.19

000.

373

0.35

70.

133

0.12

20.

020

0.06

00.

050

0.06

80.

048

0.19

20.

112

0.03

12

0.11

30.

089

120.

2160

0.42

50.

407

0.15

10.

139

0.02

50.

067

0.05

60.

077

0.05

50.

252

0.12

80.

034

30.

124

0.09

8

1 ⁄ 40.

2500

0.49

20.

473

0.17

50.

162

0.03

50.

075

0.06

40.

087

0.06

30.

274

0.14

80.

036

30.

144

0.11

85 ⁄ 1

60.

3125

0.61

50.

594

0.21

80.

203

0.04

00.

084

0.07

20.

106

0.07

60.

343

0.18

10.

059

40.

173

0.14

93 ⁄ 8

0.37

500.

740

0.71

60.

261

0.24

40.

040

0.09

40.

081

0.12

40.

090

0.38

20.

221

0.06

54

0.21

30.

190

7 ⁄ 16

0.43

750.

863

0.83

80.

304

0.28

60.

050

0.09

40.

081

0.14

20.

105

0.40

60.

246

0.06

84

0.23

90.

214

1 ⁄ 20.

5000

0.98

70.

958

0.34

80.

327

0.05

50.

106

0.09

10.

161

0.11

80.

428

0.26

70.

071

40.

260

0.23

5

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Due

toth

eun

derf

illof

mat

eria

lca

used

byth

eco

mbi

nati

onre

cess

,th

em

inim

umsl

otde

pths

are

appr

oxim

atel

y10

%lo

wer

than

slot

ted

pan

head

s.

53


Table 9D Dimensions of Type IA Cross Recessed Pan Head Machine Screws

Head Head RecessNominal SizeDiameter, Height, Penetrationor Basic Screw Head Recess Recess Recess

A H Gaging DepthDiameter Radius, Diameter, Depth, Width, Driver[Note (1)] Max. Min. Max. Min. R, Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.116 0.104 0.044 0.036 0.005 0.060 0.032 0.018 0 0.033 0.0171 0.0730 0.142 0.130 0.053 0.044 0.005 0.067 0.039 0.018 0 0.040 0.0242 0.0860 0.167 0.155 0.062 0.053 0.010 0.097 0.056 0.028 1 0.053 0.0373 0.0990 0.193 0.180 0.071 0.062 0.010 0.105 0.065 0.029 1 0.062 0.046

4 0.1120 0.219 0.205 0.080 0.070 0.010 0.115 0.075 0.029 1 0.072 0.0565 0.1250 0.245 0.231 0.089 0.079 0.015 0.147 0.075 0.040 2 0.068 0.0506 0.1380 0.270 0.256 0.097 0.087 0.015 0.155 0.083 0.040 2 0.076 0.058

8 0.1640 0.322 0.306 0.115 0.105 0.015 0.170 0.099 0.041 2 0.092 0.07410 0.1900 0.373 0.357 0.133 0.122 0.020 0.185 0.115 0.041 2 0.108 0.09012 0.2160 0.425 0.407 0.151 0.139 0.025 0.247 0.130 0.056 3 0.117 0.099

1⁄4 0.2500 0.492 0.473 0.175 0.162 0.035 0.266 0.150 0.057 3 0.137 0.1195⁄16 0.3125 0.615 0.594 0.218 0.203 0.040 0.334 0.182 0.086 4 0.164 0.146

3⁄8 0.3750 0.740 0.716 0.261 0.244 0.040 0.370 0.219 0.086 4 0.201 0.1837⁄16 0.4375 0.863 0.837 0.305 0.284 0.050 0.392 0.242 0.086 4 0.224 0.206

1⁄2 0.5000 0.987 0.958 0.348 0.325 0.055 0.413 0.264 0.086 4 0.246 0.2289⁄16 0.5625 1.041 1.000 0.391 0.366 0.065 0.444 0.295 0.087 4 0.277 0.259

5⁄8 0.6250 1.172 1.125 0.434 0.406 0.075 0.558 0.322 0.098 5 0.295 0.2743⁄4 0.7500 1.435 1.375 0.521 0.488 0.085 0.602 0.368 0.098 5 0.341 0.320



omitted.

54


M

W

N

Th

is t

ype

of

rece

ss h

as a

larg

ece

nte

r o

pen

ing

, wid

e st

raig

ht

win

gs,

an

d a

blu

nt

bo

tto

m, w

ith

top

ed

ges

rel

ieve

d o

r ro

un

ded

.A

slo

t ru

ns

par

alle

l to

on

e p

air

of

rece

ss w

ing

s.

AD

T

R

HL

Tabl

e9E

Dim

ensi

ons

ofCo

mbi

nati

onS

lott

ed—

Type

IACr

oss

Rece

ssed

Pan

Hea

dM

achi

neS

crew

s

Hea

dRe

cess

Nom

inal

Siz

eD

iam

eter

,H

ead

Hei

ght,

Slo

tW

idth

,S

lot

Dep

th,

Pene

trat

ion

orB

asic

Scr

ewH

ead

Rece

ssRe

cess

Rece

ssA

HW

D[N

ote

(2)]

Gag

ing

Dep

th,

PD

iam

eter

Rad

ius,

Dia

met

er,

Dep

th,

Wid

th,

Dri

ver

[Not

e(1

)]M

ax.

Min

.M

ax.

Min

.R,

Min

.M

ax.

Min

.M

ax.

Min

.M

,Re

f.T,

Ref.

N,

Ref.

Siz

eM

ax.

Min

.

00.

0600

0.11

60.

104

0.04

40.

036

0.00

50.

023

0.01

60.

022

0.01

30.

060

0.03

20.

018

00.

033

0.01

71

0.07

300.

142

0.13

00.

053

0.04

40.

005

0.02

60.

019

0.02

70.

017

0.06

70.

039

0.01

80

0.04

00.

024

20.

0860

0.16

70.

155

0.06

20.

053

0.01

00.

031

0.02

30.

031

0.02

00.

097

0.05

60.

028

10.

053

0.03

73

0.09

900.

193

0.18

00.

071

0.06

20.

010

0.03

50.

027

0.03

60.

023

0.10

50.

065

0.02

91

0.06

20.

046

40.

1120

0.21

90.

205

0.08

00.

070

0.01

00.

039

0.03

10.

040

0.02

70.

115

0.07

50.

029

10.

072

0.05

6

50.

1250

0.24

50.

231

0.08

90.

079

0.01

50.

043

0.03

50.

045

0.03

00.

147

0.07

50.

040

20.

068

0.05

06

0.13

800.

270

0.25

60.

097

0.08

70.

015

0.04

80.

039

0.05

00.

033

0.15

50.

083

0.04

02

0.07

60.

058

80.

1640

0.32

20.

306

0.11

50.

105

0.01

50.

054

0.04

50.

058

0.04

10.

170

0.09

90.

041

20.

092

0.07

410

0.19

000.

373

0.35

70.

133

0.12

20.

020

0.06

00.

050

0.06

80.

048

0.18

50.

115

0.04

12

0.10

80.

090

120.

2160

0.42

50.

407

0.15

10.

139

0.02

50.

067

0.05

60.

077

0.05

50.

247

0.13

00.

056

30.

117

0.09

9

1 ⁄ 40.

2500

0.49

20.

473

0.17

50.

162

0.03

50.

075

0.06

40.

087

0.06

30.

266

0.15

00.

057

30.

137

0.11

95 ⁄ 1

60.

3125

0.61

50.

594

0.21

80.

203

0.04

00.

084

0.07

20.

106

0.07

60.

334

0.18

20.

086

40.

164

0.14

63 ⁄ 8

0.37

500.

740

0.71

60.

261

0.24

40.

040

0.09

40.

081

0.12

40.

090

0.37

00.

219

0.08

64

0.20

10.

183

7 ⁄ 16

0.43

750.

863

0.83

80.

304

0.28

60.

050

0.09

40.

081

0.14

20.

105

0.39

20.

242

0.08

64

0.22

40.

206

1 ⁄ 20.

5000

0.98

70.

958

0.34

80.

327

0.05

50.

106

0.09

10.

161

0.11

80.

413

0.26

40.

086

40.

246

0.22

8

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Due

toth

eun

derf

illof

mat

eria

lca

used

byth

eco

mbi

nati

onre

cess

,th

em

inim

umsl

otde

pths

are

appr

oxim

atel

y10

%lo

wer

than

slot

ted

pan

head

s.

55


Table 9F Dimensions of Type II Cross Recessed Pan Head Machine Screws

Head HeadNominal SizeDiameter, Height, Recess Penetrationor Basic Screw Head Recess Recess Recess Driver

A H Gaging DepthDiameter Radius, Diameter, Depth, Width, Size[Note (1)] Max. Min. Max. Min. R, Min. M, Ref. T, Ref. N, Ref. [Note (2)] Max. Min.

0 0.0600 0.116 0.104 0.044 0.036 0.005 0.071 0.032 0.022 . . . [Note (3)] [Note (3)]1 0.0730 0.142 0.130 0.053 0.044 0.005 0.084 0.040 0.024 . . . [Note (3)] [Note (3)]2 0.0860 0.167 0.155 0.062 0.053 0.010 0.103 0.052 0.027 . . . 0.033 0.0223 0.0990 0.193 0.180 0.071 0.062 0.010 0.119 0.062 0.029 . . . 0.043 0.032

4 0.1120 0.219 0.205 0.080 0.070 0.010 0.136 0.072 0.032 . . . 0.055 0.0435 0.1250 0.245 0.231 0.089 0.079 0.015 0.152 0.083 0.034 . . . 0.066 0.0526 0.1380 0.270 0.256 0.097 0.087 0.015 0.169 0.089 0.037 . . . 0.077 0.064

8 0.1640 0.322 0.306 0.115 0.105 0.015 0.199 0.108 0.041 . . . 0.097 0.08310 0.1900 0.373 0.357 0.133 0.122 0.020 0.232 0.129 0.046 . . . 0.118 0.10412 0.2160 0.425 0.407 0.151 0.139 0.025 0.263 0.150 0.051 . . . 0.139 0.124

1⁄4 0.2500 0.492 0.473 0.175 0.162 0.035 0.309 0.171 0.058 . . . 0.169 0.1535⁄16 0.3125 0.615 0.594 0.218 0.203 0.040 0.385 0.221 0.069 . . . 0.220 0.202

3⁄8 0.3750 0.740 0.716 0.261 0.244 0.040 0.468 0.276 0.081 . . . 0.275 0.2567⁄16 0.4375 0.863 0.837 0.305 0.284 0.050 0.544 0.325 0.093 . . . 0.325 0.304

1⁄2 0.5000 0.987 0.958 0.348 0.325 0.055 0.617 0.373 0.104 . . . 0.373 0.3529⁄16 0.5625 1.041 1.000 0.391 0.366 0.065 0.625 0.378 0.105 . . . 0.378 0.357

5⁄8 0.6250 1.172 1.125 0.434 0.406 0.075 0.625 0.378 0.105 . . . 0.378 0.3573⁄4 0.7500 1.435 1.375 0.521 0.488 0.085 0.625 0.378 0.105 . . . 0.378 0.357



omitted.(2) Point same on all drivers.(3) Not practical to gage.

56


M

This type of recess has asquare center opening,slightly tapered side walls,and a conical bottom, withtop edges relieved or rounded.

A

P

T

R

H L

Table 9G Dimensions of Type III Square Recessed Pan Head Machine Screws

Head HeadNominal Size RecessDiameter, Height, Penetration Gagingor Basic Screw Head Across Recess Recess

A H Depth, P [Note (3)]Diameter Radius, Flats, Depth, Size[Note (1)] Max. Min. Max. Min. R, Min. M, Ref. T, Ref. [Note (2)] Max. Min.

3 0.0990 0.193 0.180 0.078 0.069 0.010 0.070 0.066 0 0.038 0.0284 0.1120 0.219 0.205 0.086 0.076 0.010 0.070 0.066 0 0.038 0.0285 0.1250 0.245 0.231 0.095 0.085 0.015 0.091 0.106 1R 0.065 0.0506 0.1380 0.270 0.256 0.103 0.093 0.015 0.091 0.106 1R 0.065 0.050

8 0.1640 0.322 0.306 0.120 0.110 0.015 0.112 0.127 2R 0.075 0.06010 0.1900 0.373 0.357 0.137 0.126 0.020 0.112 0.127 2R 0.075 0.06012 0.2160 0.425 0.407 0.153 0.141 0.025 0.133 0.158 3R 0.095 0.080

1⁄4 0.2500 0.492 0.473 0.175 0.162 0.035 0.133 0.158 3R 0.095 0.0805⁄16 0.3125 0.615 0.594 0.218 0.203 0.040 0.191 0.194 4R 0.100 0.085

3⁄8 0.3750 0.740 0.716 0.261 0.244 0.040 0.191 0.194 4R 0.100 0.085



omitted.(2) “R” in the recess size tabulation means regular depth recess.(3) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging

depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specifiedhere are for finished (plated) product. Manufacturers should be advised that they should not use all this tolerance inthe heading process, or an out of tolerance condition could exist after plating.

57


M

WT

his

typ

e o

f re

cess

has

asq

uar

e ce

nte

r o

pen

ing

,sl

igh

tly

tap

ered

sid

e w

alls

,a

con

ical

bo

tto

m, w

ith

top

ed

ges

rel

ieve

d o

rro

un

ded

. A s

lot

run

s th

rou

gh

the

rece

ss. S

lot

may

ru

nei

ther

dia

go

nal

or

acro

ssfl

ats

at t

he

op

tio

n o

f th

em

anu

fact

ure

r.A

PTD

R

HL

Op

tio

na

l F

lat

To

p H

ea

d

De

sig

n

Tabl

e9H

Dim

ensi

ons

ofCo

mbi

nati

onS

lott

ed—

Type

IIIS

quar

eRe

cess

edPa

nH

ead

Mac

hine

Scr

ews

Hea

dPe

netr

atio

nN

omin

alS

ize

Rece

ssD

iam

eter

,H

ead

Hei

ght,

Slo

tW

idth

,S

lot

Dep

th,

Gag

ing

Dep

th,

Por

Bas

icS

crew

Hea

dA

cros

sRe

cess

Rece

ssA

HW

D[N

ote

(2)]

[Not

e(4

)]D

iam

eter

Rad

ius,

Flat

s,D

epth

,S

ize

[Not

e(1

)]M

ax.

Min

.M

ax.

Min

.R,

Min

.M

ax.

Min

.M

ax.

Min

.M

,Re

f.T,

Ref.

[Not

e(3

)]M

ax.

Min

.

30.

0990

0.19

30.

180

0.07

80.

069

0.01

00.

035

0.02

70.

036

0.02

30.

070

0.06

60

0.03

80.

028

40.

1120

0.21

90.

205

0.08

60.

076

0.01

00.

039

0.03

10.

040

0.02

70.

070

0.06

60

0.03

80.

028

50.

1250

0.24

50.

231

0.09

50.

085

0.01

50.

043

0.03

50.

045

0.03

00.

091

0.10

61R

0.06

50.

050

60.

1380

0.27

00.

256

0.10

30.

093

0.01

50.

048

0.03

90.

050

0.03

30.

091

0.10

61R

0.06

50.

050

80.

1640

0.32

20.

306

0.12

00.

110

0.01

50.

054

0.04

50.

058

0.04

10.

112

0.12

72R

0.07

50.

060

100.

1900

0.37

30.

357

0.13

70.

126

0.02

00.

060

0.05

00.

068

0.04

80.

112

0.12

72R

0.07

50.

060

120.

2160

0.42

50.

407

0.15

30.

141

0.02

50.

067

0.05

60.

077

0.05

50.

133

0.15

83R

0.09

50.

080

1 ⁄ 40.

2500

0.49

20.

473

0.17

50.

162

0.03

50.

075

0.06

40.

087

0.06

30.

133

0.15

83R

0.09

50.

080

5 ⁄ 16

0.31

250.

615

0.59

40.

218

0.20

30.

040

0.08

40.

072

0.10

60.

076

0.19

10.

194

4R0.

100

0.08

53 ⁄ 8

0.37

500.

740

0.71

60.

261

0.24

40.

040

0.09

40.

081

0.12

40.

090

0.19

10.

194

4R0.

100

0.08

5

GEN

ERA

LN

OTE

:Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Due

toth

eun

derf

illof

mat

eria

lca

used

byth

eco

mbi

nati

onre

cess

,th

em

inim

umsl

otde

pths

are

appr

oxim

atel

y10

%lo

wer

than

slot

ted

pan

head

s.(3

)“R

”in

the

rece

sssi

zeta

bula

tion

mea

nsre

gula

rde

pth

rece

ss.

(4)

Squ

are

rece

sses

inco

rpor

ate

asl

ight

tape

ron

the

side

sof

the

rece

ss.

This

tape

rca

nre

sult

inlo

ssof

pene

trat

ion

gagi

ngde

pth

onfin

ishe

dfa

sten

ers

due

toth

ebu

ildup

ofpl

atin

gin

the

rece

sses

.Th

ere

cess

pene

trat

ion

dim

ensi

ons

spec

ified

here

are

for

finis

hed

(pla

ted)

prod

uct.

Man

ufac

ture

rssh

ould

bead

vise

dth

atth

eysh

ould

not

use

all

this

tole

ranc

ein

the

head

ing

proc

ess,

oran

out

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lera

nce

cond

itio

nco

uld

exis

taf

ter

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ing.

58


Table 10A Dimensions of Slotted Fillister Head Machine Screws

Head Slot SlotNominal SizeDiameter, Head Side Height, Total Head Height, Width, Depth,or Basic Screw

A H O J TDiameter[Note (2)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.

0000 0.0210 0.038 0.032 0.019 0.011 0.025 0.015 0.008 0.004 0.012 0.006000 0.0340 0.059 0.053 0.029 0.021 0.035 0.027 0.012 0.006 0.017 0.011

00 0.0470 0.082 0.072 0.037 0.028 0.047 0.039 0.017 0.010 0.022 0.015

0 0.0600 0.096 0.083 0.043 0.038 0.055 0.047 0.023 0.016 0.025 0.0151 0.0730 0.118 0.104 0.053 0.045 0.066 0.058 0.026 0.019 0.031 0.0202 0.0860 0.140 0.124 0.062 0.053 0.083 0.066 0.031 0.023 0.037 0.0253 0.0990 0.161 0.145 0.070 0.061 0.095 0.077 0.035 0.027 0.043 0.030

4 0.1120 0.183 0.166 0.079 0.069 0.107 0.088 0.039 0.031 0.048 0.0355 0.1250 0.205 0.187 0.088 0.078 0.120 0.100 0.043 0.035 0.054 0.0406 0.1380 0.226 0.208 0.096 0.086 0.132 0.111 0.048 0.039 0.060 0.045

8 0.1640 0.270 0.250 0.113 0.102 0.156 0.133 0.054 0.045 0.071 0.05410 0.1900 0.313 0.292 0.130 0.118 0.180 0.156 0.060 0.050 0.083 0.06412 0.2160 0.357 0.334 0.148 0.134 0.205 0.178 0.067 0.056 0.094 0.074

1⁄4 0.2500 0.414 0.389 0.170 0.155 0.237 0.207 0.075 0.064 0.109 0.0875⁄16 0.3125 0.518 0.490 0.211 0.194 0.295 0.262 0.084 0.072 0.137 0.110

3⁄8 0.3750 0.622 0.590 0.253 0.233 0.355 0.315 0.094 0.081 0.164 0.1337⁄16 0.4375 0.625 0.589 0.265 0.242 0.368 0.321 0.094 0.081 0.170 0.135

1⁄2 0.5000 0.750 0.710 0.297 0.273 0.412 0.362 0.106 0.091 0.190 0.1519⁄16 0.5625 0.812 0.768 0.336 0.308 0.466 0.410 0.118 0.102 0.214 0.172

5⁄8 0.6250 0.875 0.827 0.375 0.345 0.521 0.461 0.133 0.116 0.240 0.1933⁄4 0.7500 1.000 0.945 0.441 0.406 0.612 0.542 0.149 0.131 0.281 0.226


NOTES:(1) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is

equal to no less than 90% of the specified minimum head diameter.(2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.

59


Table 10B Dimensions of Type I Cross Recessed Fillister Head Machine Screws

Head Side Total Head RecessNominal SizeHead Diameter, Height, Height, Penetrationor Basic Screw Recess Recess Recess

A H O Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref, T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.096 0.083 0.043 0.038 0.055 0.047 0.060 0.030 0.013 0 0.032 0.0141 0.0730 0.118 0.104 0.053 0.045 0.066 0.058 0.067 0.035 0.014 0 0.040 0.0222 0.0860 0.140 0.124 0.062 0.053 0.083 0.066 0.097 0.050 0.017 1 0.052 0.0343 0.0990 0.161 0.145 0.070 0.061 0.095 0.077 0.105 0.059 0.019 1 0.061 0.043

4 0.1120 0.183 0.166 0.079 0.069 0.107 0.088 0.115 0.069 0.019 1 0.071 0.0535 0.1250 0.205 0.187 0.088 0.078 0.120 0.100 0.136 0.054 0.027 2 0.056 0.0316 0.1380 0.226 0.208 0.096 0.086 0.132 0.111 0.159 0.078 0.028 2 0.080 0.055

8 0.1640 0.270 0.250 0.113 0.102 0.156 0.133 0.175 0.095 0.030 2 0.097 0.07110 0.1900 0.313 0.292 0.130 0.118 0.180 0.156 0.192 0.112 0.031 2 0.113 0.08912 0.2160 0.357 0.334 0.148 0.134 0.205 0.178 0.252 0.128 0.034 3 0.124 0.098

1⁄4 0.2500 0.414 0.389 0.170 0.155 0.237 0.207 0.274 0.148 0.036 3 0.144 0.1185⁄16 0.3125 0.518 0.490 0.211 0.194 0.295 0.262 0.315 0.190 0.042 3 0.186 0.160

3⁄8 0.3750 0.622 0.590 0.253 0.233 0.355 0.315 0.382 0.221 0.065 4 0.213 0.1907⁄16 0.4375 0.625 0.589 0.265 0.242 0.368 0.321 0.406 0.246 0.068 4 0.239 0.214

1⁄2 0.5000 0.750 0.710 0.297 0.273 0.412 0.362 0.428 0.267 0.071 4 0.260 0.2359⁄16 0.5625 0.812 0.768 0.336 0.308 0.466 0.410 0.456 0.300 0.076 4 0.292 0.268

5⁄8 0.6250 0.875 0.827 0.375 0.345 0.521 0.461 0.575 0.328 0.081 5 0.310 0.2813⁄4 0.7500 1.000 0.945 0.441 0.406 0.612 0.542 0.621 0.368 0.086 5 0.349 0.322




omitted.

60


Table 10C Dimensions of Type IA Cross Recessed Fillister Head Machine Screws

Head Side Total Head RecessNominal SizeHead Diameter, Height, Height, Penetrationor Basic Screw Recess Recess Recess

A H O Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref, T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.096 0.083 0.043 0.038 0.055 0.047 0.060 0.032 0.018 0 0.033 0.0171 0.0730 0.118 0.104 0.053 0.045 0.066 0.058 0.067 0.039 0.018 0 0.040 0.0242 0.0860 0.140 0.124 0.062 0.053 0.083 0.066 0.097 0.056 0.028 1 0.053 0.0373 0.0990 0.161 0.145 0.070 0.061 0.095 0.077 0.105 0.065 0.029 1 0.062 0.046

4 0.1120 0.183 0.166 0.079 0.069 0.107 0.088 0.115 0.075 0.029 1 0.072 0.0565 0.1250 0.205 0.187 0.088 0.078 0.120 0.100 0.133 0.061 0.040 2 0.054 0.0366 0.1380 0.226 0.208 0.096 0.086 0.132 0.111 0.155 0.083 0.040 2 0.076 0.058

8 0.1640 0.270 0.250 0.113 0.102 0.156 0.133 0.170 0.099 0.041 2 0.092 0.07410 0.1900 0.313 0.292 0.130 0.118 0.180 0.156 0.186 0.115 0.041 2 0.108 0.09012 0.2160 0.357 0.334 0.148 0.134 0.205 0.178 0.247 0.130 0.056 3 0.117 0.099

1⁄4 0.2500 0.414 0.389 0.170 0.155 0.237 0.207 0.266 0.150 0.057 3 0.137 0.1195⁄16 0.3125 0.518 0.490 0.211 0.194 0.295 0.262 0.308 0.193 0.057 3 0.181 0.163

3⁄8 0.3750 0.622 0.590 0.253 0.233 0.355 0.315 0.370 0.219 0.086 4 0.201 0.1837⁄16 0.4375 0.625 0.589 0.265 0.242 0.368 0.321 0.392 0.242 0.086 4 0.224 0.206

1⁄2 0.5000 0.750 0.710 0.297 0.273 0.412 0.362 0.413 0.264 0.086 4 0.246 0.2289⁄16 0.5625 0.812 0.768 0.336 0.308 0.466 0.410 0.444 0.295 0.087 4 0.277 0.259

5⁄8 0.6250 0.875 0.827 0.375 0.345 0.521 0.461 0.558 0.322 0.098 5 0.295 0.2743⁄4 0.7500 1.000 0.945 0.441 0.406 0.612 0.542 0.602 0.368 0.098 5 0.341 0.320




omitted.

61


Table 10D Dimensions of Type II Cross Recessed Fillister Head Machine Screws

Head Head Side Total HeadNominal SizeDiameter, Height, Height, Recess Penetrationor Basic Screw Recess Recess Recess Driver

A H O Gaging DepthDiameter Diameter, Depth, Width, Size[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref, T, Ref. N, Ref. [Note (3)] Max. Min.

0 0.0600 0.096 0.083 0.043 0.038 0.055 0.047 0.067 0.067 0.020 . . . [Note (4)] [Note (4)]1 0.0730 0.118 0.104 0.053 0.045 0.066 0.058 0.083 0.083 0.022 . . . [Note (4)] [Note (4)]2 0.0860 0.140 0.124 0.062 0.053 0.083 0.066 0.099 0.099 0.024 . . . 0.030 0.0193 0.0990 0.161 0.145 0.070 0.061 0.095 0.077 0.115 0.115 0.027 . . . 0.041 0.029

4 0.1120 0.183 0.166 0.079 0.069 0.107 0.088 0.130 0.130 0.029 . . . 0.051 0.0395 0.1250 0.205 0.187 0.088 0.078 0.120 0.100 0.147 0.147 0.031 . . . 0.062 0.0496 0.1380 0.226 0.208 0.096 0.086 0.132 0.111 0.163 0.163 0.034 . . . 0.073 0.060

8 0.1640 0.270 0.250 0.113 0.102 0.156 0.133 0.194 0.195 0.039 . . . 0.094 0.08010 0.1900 0.313 0.292 0.130 0.118 0.180 0.156 0.227 0.227 0.043 . . . 0.115 0.10112 0.2160 0.357 0.334 0.148 0.134 0.205 0.178 0.259 0.259 0.048 . . . 0.137 0.121

1⁄4 0.2500 0.414 0.389 0.170 0.155 0.237 0.207 0.299 0.299 0.054 . . . 0.163 0.1475⁄16 0.3125 0.518 0.490 0.211 0.194 0.295 0.262 0.377 0.377 0.066 . . . 0.215 0.197

3⁄8 0.3750 0.622 0.590 0.253 0.233 0.355 0.315 0.454 0.454 0.077 . . . 0.266 0.2467⁄16 0.4375 0.625 0.589 0.265 0.242 0.368 0.321 0.454 0.454 0.077 . . . 0.266 0.246

1⁄2 0.5000 0.750 0.710 0.297 0.273 0.412 0.362 0.547 0.547 0.091 . . . 0.328 0.3059⁄16 0.5625 0.812 0.768 0.336 0.308 0.466 0.410 0.592 0.592 0.097 . . . 0.359 0.333

5⁄8 0.6250 0.875 0.827 0.375 0.345 0.521 0.461 0.592 0.592 0.097 . . . 0.359 0.3333⁄4 0.7500 1.000 0.945 0.441 0.406 0.612 0.542 0.592 0.592 0.097 . . . 0.359 0.333





62


M

This type of recess has a square center opening, slightly tapered side walls, and a conical bottom, with top edges relieved or rounded.

A H

T

P

O L

[Note (1)]

Table 10E Dimensions of Type III Square Recessed Fillister Head Machine Screws

RecessHead Side Total Head PenetrationNominal Size

Head Diameter, Height, Height, Gaging Depth,or Basic Screw Recess Recess RecessA H O P [Note (4)]Diameter Across Flats, Depth, Size

[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. [Note (3)] Max. Min.

3 0.0990 0.161 0.145 0.070 0.061 0.095 0.077 0.070 0.066 0 0.038 0.0284 0.1120 0.183 0.166 0.079 0.069 0.107 0.088 0.070 0.066 0 0.038 0.0285 0.1250 0.205 0.187 0.088 0.078 0.120 0.100 0.091 0.106 1R 0.065 0.0506 0.1380 0.226 0.208 0.096 0.086 0.132 0.111 0.091 0.106 1R 0.065 0.0508 0.1640 0.270 0.250 0.113 0.102 0.156 0.133 0.112 0.127 2R 0.075 0.060

10 0.1900 0.313 0.292 0.130 0.118 0.180 0.156 0.112 0.127 2R 0.075 0.06012 0.2160 0.357 0.334 0.148 0.134 0.205 0.178 0.133 0.158 3R 0.095 0.0801⁄4 0.2500 0.414 0.389 0.170 0.155 0.237 0.207 0.133 0.158 3R 0.095 0.080

5⁄16 0.3125 0.518 0.490 0.211 0.194 0.295 0.262 0.191 0.194 4R 0.100 0.0853⁄8 0.3750 0.622 0.590 0.253 0.233 0.355 0.315 0.191 0.194 4R 0.100 0.085






63


Table 11 Dimensions of Slotted Drilled Fillister Head Machine Screws

Head Head Side Total Head SlotNominal Size Drilled Hole Drilled HoleDiameter, Height, Height, Slot Width, Depth,or Basic Screw Location, Diameter,

A H O J TDiameter E, Basic F, Basic[Note (3)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note (1)] [Note (1)]

2 0.0860 0.140 0.124 0.062 0.055 0.083 0.070 0.031 0.023 0.030 0.022 0.026 0.0313 0.0990 0.161 0.145 0.070 0.064 0.095 0.082 0.035 0.027 0.034 0.026 0.030 0.037

4 0.1120 0.183 0.166 0.079 0.072 0.107 0.094 0.039 0.031 0.038 0.030 0.035 0.0375 0.1250 0.205 0.187 0.088 0.081 0.120 0.106 0.043 0.035 0.042 0.033 0.038 0.0466 0.1380 0.226 0.208 0.096 0.089 0.132 0.118 0.048 0.039 0.045 0.035 0.043 0.046

8 0.1640 0.270 0.250 0.113 0.106 0.156 0.141 0.054 0.045 0.065 0.054 0.043 0.04610 0.1900 0.313 0.292 0.130 0.123 0.180 0.165 0.060 0.050 0.075 0.064 0.043 0.04612 0.2160 0.357 0.334 0.148 0.139 0.205 0.188 0.067 0.056 0.087 0.074 0.053 0.046

1⁄4 0.2500 0.414 0.389 0.170 0.161 0.237 0.219 0.075 0.064 0.102 0.087 0.062 0.0625⁄16 0.3125 0.518 0.490 0.211 0.201 0.295 0.276 0.084 0.072 0.130 0.110 0.078 0.070

3⁄8 0.3750 0.622 0.590 0.253 0.242 0.355 0.333 0.094 0.081 0.154 0.134 0.094 0.070


NOTES:(1) Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of

the slot. Edges of the hole shall be free from burrs.(2) A slight rounding of the edges at periphery of head shall be permissible provided the diameter of the bearing circle is


omitted.

64


Table 12A Dimensions of Slotted Truss Head Machine Screws

Head Head Slot SlotNominal SizeDiameter, Height, Width, Depth,or Basic Screw Head

A H J TDiameter Radius,[Note (1)] Max. Min. Max. Min. R, Max. Max. Min. Max. Min.

0000 0.0210 0.049 0.043 0.014 0.010 0.032 0.009 0.005 0.009 0.005000 0.0340 0.077 0.071 0.022 0.018 0.051 0.013 0.009 0.013 0.009

00 0.0470 0.106 0.098 0.030 0.024 0.070 0.017 0.010 0.018 0.012

0 0.0600 0.131 0.119 0.037 0.029 0.087 0.023 0.016 0.022 0.0141 0.0730 0.164 0.149 0.045 0.037 0.107 0.026 0.019 0.027 0.0182 0.0860 0.194 0.180 0.053 0.044 0.129 0.031 0.023 0.031 0.0223 0.0990 0.226 0.211 0.061 0.051 0.151 0.035 0.027 0.036 0.026

4 0.1120 0.257 0.241 0.069 0.059 0.169 0.039 0.031 0.040 0.0305 0.1250 0.289 0.272 0.078 0.066 0.191 0.043 0.035 0.045 0.0346 0.1380 0.321 0.303 0.086 0.074 0.211 0.048 0.039 0.050 0.037

8 0.1640 0.384 0.364 0.102 0.088 0.254 0.054 0.045 0.058 0.04510 0.1900 0.448 0.425 0.118 0.103 0.283 0.060 0.050 0.068 0.05312 0.2160 0.511 0.487 0.134 0.118 0.336 0.067 0.056 0.077 0.061

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.375 0.075 0.064 0.087 0.0705⁄16 0.3125 0.698 0.666 0.183 0.162 0.457 0.084 0.072 0.106 0.085

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.538 0.094 0.081 0.124 0.1007⁄16 0.4375 0.948 0.907 0.248 0.221 0.619 0.094 0.081 0.142 0.116

1⁄2 0.5000 1.073 1.028 0.280 0.250 0.701 0.106 0.091 0.161 0.1319⁄16 0.5625 1.198 1.149 0.312 0.279 0.783 0.118 0.102 0.179 0.146

5⁄8 0.6250 1.323 1.269 0.345 0.309 0.863 0.133 0.116 0.196 0.1623⁄4 0.7500 1.573 1.511 0.410 0.368 1.024 0.149 0.131 0.234 0.182



omitted.

65


This type of recess has a large centeropening, tapered wings, and a bluntbottom, with top edges relieved orrounded. A slot runs parallel to one pair of recess wings.

Not to exceedmaximum majordiameter ofthread

HA

D

T

L

0.062 min.

Optional Shoulder for Long

Screws With Reduced Body

W

M

N

Table 12B Dimensions of Combination Slotted — Type I Cross Recessed Truss HeadMachine Screws

RecessHead PenetrationNominal Size

Diameter, Head Height, Slot Width, Slot Depth, Gaging Depth,or Basic Screw Recess Recess RecessA H W D [Note (2)] PDiameter Diameter, Depth, Width, Driver

[Note (1)] Max. Min. Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.131 0.119 0.037 0.029 0.023 0.016 0.022 0.013 0.056 0.028 0.013 0 0.030 0.0121 0.0730 0.164 0.149 0.045 0.037 0.026 0.019 0.027 0.016 0.064 0.036 0.014 0 0.038 0.0202 0.0860 0.194 0.180 0.053 0.044 0.031 0.023 0.031 0.020 0.097 0.050 0.018 1 0.052 0.0343 0.0990 0.226 0.211 0.061 0.051 0.035 0.027 0.036 0.023 0.103 0.057 0.018 1 0.059 0.0424 0.1120 0.257 0.241 0.069 0.059 0.039 0.031 0.040 0.027 0.105 0.060 0.018 1 0.062 0.044

5 0.1250 0.289 0.272 0.078 0.066 0.043 0.035 0.045 0.030 0.121 0.076 0.019 1 0.078 0.0606 0.1380 0.321 0.303 0.086 0.074 0.048 0.039 0.050 0.033 0.151 0.071 0.027 2 0.073 0.0488 0.1640 0.384 0.364 0.102 0.088 0.054 0.045 0.058 0.040 0.166 0.086 0.029 2 0.088 0.063

10 0.1900 0.448 0.425 0.118 0.103 0.060 0.050 0.068 0.048 0.181 0.102 0.030 2 0.104 0.07912 0.2160 0.511 0.487 0.134 0.118 0.067 0.056 0.077 0.055 0.241 0.115 0.032 3 0.111 0.086

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.075 0.064 0.087 0.063 0.256 0.130 0.033 3 0.126 0.1015⁄16 0.3125 0.698 0.666 0.183 0.162 0.084 0.072 0.106 0.076 0.345 0.180 0.059 4 0.173 0.148

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.094 0.081 0.124 0.090 0.376 0.214 0.063 4 0.206 0.1827⁄16 0.4375 0.948 0.907 0.248 0.221 0.094 0.081 0.142 0.104 0.407 0.244 0.068 4 0.237 0.212

1⁄2 0.5000 1.073 1.028 0.280 0.250 0.106 0.091 0.161 0.118 0.437 0.275 0.072 4 0.268 0.2439⁄16 0.5625 1.198 1.149 0.312 0.279 0.118 0.102 0.179 0.131 0.439 0.290 0.074 4 0.282 0.258

5⁄8 0.6250 1.323 1.269 0.345 0.309 0.133 0.116 0.196 0.146 0.547 0.305 0.077 5 0.289 0.2563⁄4 0.7500 1.573 1.511 0.410 0.368 0.149 0.131 0.234 0.164 0.608 0.368 0.085 5 0.351 0.319



omitted.(2) Due to the underfill of material caused by the combination recess, the minimum slot depths are approximately 10%

lower than slotted truss heads.

66


Table 12C Dimensions of Type I Cross Recessed Truss Head Machine Screws

Head Head RecessNominal SizeDiameter, Height, Penetrationor Basic Screw Recess Recess Recess

A H Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (1)] Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.131 0.119 0.037 0.029 0.056 0.028 0.013 0 0.030 0.0121 0.0730 0.164 0.149 0.045 0.037 0.064 0.036 0.014 0 0.038 0.0202 0.0860 0.194 0.180 0.053 0.044 0.097 0.050 0.018 1 0.052 0.0343 0.0990 0.226 0.211 0.061 0.051 0.103 0.057 0.018 1 0.059 0.042

4 0.1120 0.257 0.241 0.069 0.059 0.105 0.060 0.018 1 0.062 0.0445 0.1250 0.289 0.272 0.078 0.066 0.121 0.076 0.019 1 0.078 0.0606 0.1380 0.321 0.303 0.086 0.074 0.151 0.071 0.027 2 0.073 0.048

8 0.1640 0.384 0.364 0.102 0.088 0.166 0.086 0.029 2 0.088 0.06310 0.1900 0.448 0.425 0.118 0.103 0.181 0.102 0.030 2 0.104 0.07912 0.2160 0.511 0.487 0.134 0.118 0.241 0.115 0.032 3 0.111 0.086

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.256 0.130 0.033 3 0.126 0.1015⁄16 0.3125 0.698 0.666 0.183 0.162 0.345 0.180 0.059 4 0.173 0.148

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.376 0.214 0.063 4 0.206 0.1827⁄16 0.4375 0.948 0.907 0.248 0.221 0.407 0.244 0.068 4 0.237 0.212

1⁄2 0.5000 1.073 1.028 0.280 0.250 0.437 0.275 0.072 4 0.268 0.2439⁄16 0.5625 1.198 1.149 0.312 0.279 0.439 0.290 0.074 4 0.282 0.258

5⁄8 0.6250 1.323 1.269 0.345 0.309 0.547 0.305 0.077 5 0.289 0.2563⁄4 0.7500 1.573 1.511 0.410 0.368 0.608 0.368 0.085 5 0.351 0.319



omitted.

67


Table 12D Dimensions of Type IA Cross Recessed Truss Head Machine Screws



0 0.0600 0.131 0.119 0.037 0.029 0.055 0.029 0.018 0 0.030 0.0141 0.0730 0.164 0.149 0.045 0.037 0.063 0.037 0.018 0 0.038 0.0222 0.0860 0.194 0.180 0.053 0.044 0.091 0.051 0.029 1 0.049 0.0333 0.0990 0.226 0.211 0.061 0.051 0.098 0.058 0.029 1 0.056 0.040

4 0.1120 0.257 0.241 0.069 0.059 0.101 0.061 0.029 1 0.059 0.0435 0.1250 0.289 0.272 0.078 0.066 0.117 0.077 0.030 1 0.075 0.0596 0.1380 0.321 0.303 0.086 0.074 0.141 0.071 0.041 2 0.065 0.047

8 0.1640 0.384 0.364 0.102 0.088 0.155 0.085 0.041 2 0.079 0.06110 0.1900 0.448 0.425 0.118 0.103 0.171 0.101 0.042 2 0.095 0.07712 0.2160 0.511 0.487 0.134 0.118 0.227 0.113 0.055 3 0.101 0.083

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.241 0.127 0.056 3 0.115 0.0975⁄16 0.3125 0.698 0.666 0.183 0.162 0.326 0.178 0.086 4 0.161 0.143

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.357 0.210 0.086 4 0.192 0.1747⁄16 0.4375 0.948 0.907 0.248 0.221 0.387 0.240 0.086 4 0.223 0.205

1⁄2 0.5000 1.073 1.028 0.280 0.250 0.415 0.269 0.086 4 0.251 0.2339⁄16 0.5625 1.198 1.149 0.312 0.279 0.420 0.274 0.086 4 0.256 0.238

5⁄8 0.6250 1.323 1.269 0.345 0.309 0.524 0.293 0.097 5 0.266 0.2453⁄4 0.7500 1.573 1.511 0.410 0.368 0.581 0.351 0.098 5 0.323 0.302



omitted.

68


Table 12E Dimensions of Type II Cross Recessed Truss Head Machine Screws

Head HeadNominal SizeDiameter, Height, Recess Penetrationor Basic Screw Head Recess Recess Recess Driver

A H Gaging DepthDiameter Radius, Diameter, Depth, Width, Size[Note (1)] Max. Min. Max. Min. R, Min. M, Ref. T, Ref. N, Ref. [Note (2)] Max. Min.

0 0.0600 0.131 0.119 0.037 0.029 0.087 0.070 0.031 0.021 . . . [Note (3)] [Note (3)]1 0.0730 0.164 0.149 0.045 0.037 0.107 0.087 0.042 0.023 . . . [Note (3)] [Note (3)]2 0.0860 0.194 0.180 0.053 0.044 0.129 0.105 0.054 0.026 . . . 0.033 0.0243 0.0990 0.226 0.211 0.061 0.051 0.151 0.122 0.065 0.028 . . . 0.045 0.035

4 0.1120 0.257 0.241 0.069 0.059 0.169 0.139 0.074 0.031 . . . 0.056 0.0465 0.1250 0.289 0.272 0.078 0.066 0.191 0.157 0.086 0.033 . . . 0.068 0.0576 0.1380 0.321 0.303 0.086 0.074 0.211 0.175 0.097 0.035 . . . 0.079 0.068

8 0.1640 0.384 0.364 0.102 0.088 0.254 0.209 0.115 0.041 . . . 0.102 0.09110 0.1900 0.448 0.425 0.118 0.103 0.283 0.244 0.138 0.046 . . . 0.126 0.11312 0.2160 0.511 0.487 0.134 0.118 0.336 0.279 0.160 0.051 . . . 0.148 0.136

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.375 0.313 0.174 0.057 . . . 0.171 0.1575⁄16 0.3125 0.698 0.666 0.183 0.162 0.457 0.382 0.219 0.067 . . . 0.217 0.201

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.538 0.446 0.261 0.076 . . . 0.259 0.2427⁄16 0.4375 0.948 0.907 0.248 0.221 0.619 0.511 0.304 0.086 . . . 0.303 0.284

1⁄2 0.5000 1.073 1.028 0.280 0.250 0.701 0.588 0.354 0.097 . . . 0.354 0.3339⁄16 0.5625 1.198 1.149 0.312 0.279 0.783 0.588 0.354 0.097 . . . 0.354 0.333

5⁄8 0.6250 1.323 1.269 0.345 0.309 0.863 0.588 0.354 0.097 . . . 0.354 0.3333⁄4 0.7500 1.573 1.511 0.410 0.368 1.024 0.588 0.354 0.097 . . . 0.354 0.333




69


This type of recess has a square centeropening, slightly tapered side walls, anda conical bottom, with top edges relievedor rounded.


HA

P

T

L

0.062 min.



M

Table 12F Dimensions of Type III Square Recessed Truss Head Machine Screws

Head Head Recess PenetrationNominal SizeDiameter, Height, Gaging Depth,or Basic Screw Recess Recess Recess

A H P, [Note (3)]Diameter Across Flats, Depth, Size[Note (1)] Max. Min. Max. Min. M, Ref. T, Ref. [Note (2)] Max. Min.

2 0.0860 0.194 0.180 0.053 0.044 0.050 0.057 00 0.033 0.0283 0.0990 0.226 0.211 0.061 0.051 0.070 0.066 0 0.038 0.028

4 0.1120 0.257 0.241 0.069 0.059 0.070 0.066 0 0.038 0.0285 0.1250 0.289 0.272 0.078 0.066 0.091 0.096 1S 0.055 0.0406 0.1380 0.321 0.303 0.086 0.074 0.091 0.096 1S 0.055 0.040

8 0.1640 0.384 0.364 0.102 0.088 0.112 0.115 2S 0.063 0.04810 0.1900 0.448 0.425 0.128 0.113 0.112 0.115 2R 0.075 0.06012 0.2160 0.511 0.487 0.134 0.118 0.133 0.143 3S 0.080 0.065

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.133 0.143 3S 0.080 0.0655⁄16 0.3125 0.698 0.666 0.183 0.162 0.191 0.194 4R 0.100 0.085

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.191 0.194 4R 0.100 0.085



omitted.(2) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess.(3) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging


70


This type of recess has a square center opening,slightly tapered side walls, a conical bottom,with top edges relieved or rounded. A slotruns through the recess. Slot may run eitherdiagonal or across flats at the option of themanufacturer.


HA

JP

T

D

L

0.062 min.



M

Table 12G Dimensions of Combination Slotted — Type III Square Recessed Truss HeadMachine Screws

RecessHead PenetrationNominal Size Recess

Diameter, Head Height, Slot Width, Slot Depth, Gaging Depth,or Basic Screw Across Recess RecessA H J D [Note (2)] P [Note (4)]Diameter Flats, Depth, Size

[Note (1)] Max. Min. Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. [Note (3)] Max. Min.

2 0.0860 0.194 0.180 0.053 0.044 0.031 0.023 0.031 0.020 0.050 0.057 00 0.033 0.0283 0.0990 0.226 0.211 0.061 0.051 0.035 0.027 0.036 0.023 0.070 0.066 0 0.038 0.0284 0.1120 0.257 0.241 0.069 0.059 0.039 0.031 0.040 0.027 0.070 0.066 0 0.038 0.0285 0.1250 0.289 0.272 0.078 0.066 0.043 0.035 0.045 0.030 0.091 0.096 1S 0.055 0.040

6 0.1380 0.321 0.303 0.086 0.074 0.048 0.039 0.050 0.033 0.091 0.096 1S 0.055 0.0408 0.1640 0.384 0.364 0.102 0.088 0.054 0.045 0.058 0.040 0.112 0.115 2S 0.063 0.048

10 0.1900 0.448 0.425 0.128 0.113 0.060 0.050 0.068 0.048 0.112 0.115 2R 0.075 0.06012 0.2160 0.511 0.487 0.134 0.118 0.067 0.056 0.077 0.055 0.133 0.143 3S 0.080 0.065

1⁄4 0.2500 0.573 0.546 0.150 0.133 0.075 0.064 0.087 0.063 0.133 0.143 3S 0.080 0.0655⁄16 0.3125 0.698 0.666 0.183 0.162 0.084 0.072 0.106 0.076 0.191 0.194 4R 0.100 0.085

3⁄8 0.3750 0.823 0.787 0.215 0.191 0.094 0.081 0.124 0.090 0.191 0.194 4R 0.100 0.085




lower than slotted truss heads.(3) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess.(4) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging


71


Table 13A Dimensions of Slotted Binding Head Machine Screws

Undercut UndercutHead Total Head Head Oval Diameter, Depth,Nominal Size

Diameter, Height, Height, Slot Width, Slot Depth, U Xor Basic ScrewA O F J T [Note (2)] [Note (2)]Diameter

[Note (3)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.

0000 0.0210 0.046 0.040 0.014 0.009 0.006 0.003 0.008 0.004 0.009 0.005 . . .. . . . . . . . . .000 0.0340 0.073 0.067 0.021 0.015 0.008 0.005 0.012 0.006 0.013 0.009 . . . . . . . . . . . .

00 0.0470 0.098 0.090 0.028 0.023 0.011 0.007 0.017 0.010 0.018 0.012 . . . . . . . . . . . .

0 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.023 0.016 0.018 0.009 0.098 0.086 0.007 0.0021 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.026 0.019 0.024 0.014 0.120 0.105 0.008 0.0032 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.031 0.023 0.030 0.020 0.141 0.124 0.010 0.0053 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.035 0.027 0.036 0.025 0.162 0.143 0.011 0.006

4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.039 0.031 0.042 0.030 0.184 0.161 0.012 0.0075 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.043 0.035 0.048 0.035 0.205 0.180 0.014 0.0096 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.048 0.039 0.053 0.040 0.226 0.199 0.015 0.010

8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.054 0.045 0.065 0.050 0.269 0.236 0.017 0.01210 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.060 0.050 0.077 0.060 0.312 0.274 0.020 0.01512 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.067 0.056 0.089 0.070 0.354 0.311 0.023 0.018

1⁄4 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.075 0.064 0.105 0.084 0.410 0.360 0.026 0.0215⁄16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.084 0.072 0.134 0.108 0.513 0.450 0.032 0.027

3⁄8 0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.094 0.081 0.163 0.132 0.615 0.540 0.039 0.034


NOTES:(1) Break sharp edge on head where spherical and conical surfaces meet.(2) Unless otherwise specified by purchaser, slotted binding head machine screws shall not be undercut.(3) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.

72


Table 13B Dimensions of Type I Cross Recessed Binding Head Machine Screws

Head Total Head Head Oval RecessNominal SizeDiameter, Height, Height, Penetrationor Basic Screw Recess Recess Recess

A O F Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.060 0.031 0.013 0 0.033 0.0161 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.067 0.038 0.014 0 0.040 0.0232 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.093 0.049 0.017 1 0.051 0.0343 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.103 0.059 0.017 1 0.061 0.044

4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.111 0.068 0.017 1 0.070 0.0525 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.141 0.063 0.025 2 0.064 0.0406 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.153 0.076 0.026 2 0.077 0.053

8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.179 0.102 0.028 2 0.103 0.07910 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.198 0.121 0.029 2 0.123 0.09812 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.260 0.138 0.032 3 0.134 0.109

1⁄4 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.274 0.152 0.046 3 0.147 0.1235⁄16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.343 0.183 0.068 4 0.175 0.152

3⁄8 0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.393 0.235 0.076 4 0.227 0.203


NOTES:(1) Break sharp edge on head where spherical and conical surfaces meet.(2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.

73


Table 13C Dimensions of Type IA Cross Recessed Binding Head Machine Screws

Head Total Head Head Oval RecessNominal SizeDiameter, Height, Height, Penetrationor Basic Screw Recess Recess Recess

A O F Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

0 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.060 0.034 0.018 0 0.034 0.0181 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.067 0.041 0.018 0 0.043 0.0272 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.097 0.057 0.029 1 0.054 0.0383 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.102 0.062 0.029 1 0.059 0.043

4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.110 0.070 0.029 1 0.068 0.0525 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.137 0.066 0.040 2 0.059 0.0416 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.149 0.078 0.040 2 0.072 0.054

8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.174 0.104 0.041 2 0.097 0.07910 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.192 0.122 0.041 2 0.115 0.09712 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.253 0.138 0.056 3 0.125 0.107

1⁄4 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.267 0.152 0.057 3 0.139 0.1215⁄16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.332 0.181 0.086 4 0.163 0.145

3⁄8 0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.380 0.231 0.086 4 0.213 0.195



omitted.

74


Table 13D Dimensions of Type II Cross Recessed Binding Head Machine Screws

Head Total Head Head OvalNominal SizeDiameter, Height, Height, Recess Penetrationor Basic Screw Recess Recess Recess Driver

A O F Gaging DepthDiameter Diameter, Depth, Width, Size[Note (2)] Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. [Note (3)] Max. Min.

0 0.0600 0.126 0.119 0.032 0.026 0.012 0.008 0.078 0.036 0.023 . . . [Note (4)] [Note (4)]1 0.0730 0.153 0.145 0.041 0.035 0.015 0.011 0.092 0.045 0.025 . . . [Note (4)] [Note (4)]2 0.0860 0.181 0.171 0.050 0.043 0.018 0.013 0.112 0.058 0.028 . . . 0.039 0.0273 0.0990 0.208 0.197 0.059 0.052 0.022 0.016 0.130 0.070 0.031 . . . 0.051 0.039

4 0.1120 0.235 0.223 0.068 0.061 0.025 0.018 0.147 0.079 0.034 . . . 0.062 0.0505 0.1250 0.263 0.249 0.078 0.069 0.029 0.021 0.165 0.091 0.036 . . . 0.074 0.0616 0.1380 0.290 0.275 0.087 0.078 0.032 0.024 0.183 0.103 0.039 . . . 0.086 0.073

8 0.1640 0.344 0.326 0.105 0.095 0.039 0.029 0.216 0.119 0.044 . . . 0.108 0.09410 0.1900 0.399 0.378 0.123 0.112 0.045 0.034 0.239 0.134 0.047 . . . 0.123 0.10912 0.2160 0.454 0.430 0.141 0.130 0.052 0.039 0.284 0.163 0.054 . . . 0.153 0.137

1⁄4 0.2500 0.525 0.498 0.165 0.152 0.061 0.046 0.320 0.179 0.059 . . . 0.176 0.1605⁄16 0.3125 0.656 0.622 0.209 0.194 0.077 0.059 0.403 0.233 0.072 . . . 0.232 0.214

3⁄8 0.3750 0.788 0.746 0.253 0.235 0.094 0.071 0.468 0.275 0.081 . . . 0.275 0.255




75


This type of recess has a square center opening, slightly tapered side walls, and a conical bottom, with top edges relieved or rounded.

[Note (1)]5� ± 3�

OF

T

L

M

Table 13E Dimensions of Type III Square Recessed Binder Head Machine Screws

RecessHead Head PenetrationNominal Size Head Recess

Diameter, Height, Gaging Depth,or Basic Screw Oval Across Recess RecessA O P [Note (4)]Diameter Height, Flats, Depth, Size

[Note (2)] Max. Min. Max. Min. F, Ref. M, Ref. T, Ref. [Note (3)] Max. Min.

3 0.0990 0.208 0.197 0.059 0.052 0.020 0.070 0.070 0 0.038 0.0234 0.1120 0.235 0.223 0.068 0.061 0.022 0.070 0.070 0 0.038 0.0235 0.1250 0.263 0.249 0.078 0.069 0.025 0.091 0.100 1S 0.055 0.0406 0.1380 0.290 0.275 0.087 0.078 0.028 0.091 0.100 1S 0.055 0.040

8 0.1640 0.344 0.326 0.105 0.095 0.034 0.112 0.120 2S 0.063 0.04810 0.1900 0.399 0.378 0.123 0.112 0.040 0.112 0.120 2S 0.063 0.04812 0.2160 0.454 0.430 0.141 0.130 0.045 0.133 0.178 3S 0.080 0.065

1⁄4 0.2500 0.525 0.498 0.165 0.152 0.044 0.133 0.178 3S 0.080 0.0655⁄16 0.3125 0.656 0.622 0.209 0.194 0.068 0.191 0.199 4R 0.100 0.080

3⁄8 0.3750 0.788 0.746 0.253 0.235 0.083 0.191 0.199 4R 0.100 0.080



omitted.(3) “R” in the recess size tabulation means regular depth recess, and the “S” means short depth recess.(4) Square recesses incorporate a slight taper on the sides of the recess. This taper can result in loss of penetration gaging


76


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such

that

whe

na

shar

pri

ngha

ving

anin

side

diam

eter

equa

lto

the

spec

ified

min

imum

wid

thac

ross

corn

ers

ispl

aced

onth

eto

pan

dbo

ttom

ofth

ehe

ad,

the

head

shal

lpr

otru

deby

anam

ount

equa

lto

,or

grea

ter

than

,th

eF

valu

eta

bula

ted.

See

App

endi

xII

for

acro

ssco

rner

sga

ging

ofhe

xhe

ads.

(7)

Larg

ehe

xhe

adis

inte

nded

for

scre

wan

dw

ashe

ras

sem

blie

s(s

ems)

assp

ecifi

edin

ASM

EB

18.1

3,an

dot

her

appl

icat

ions

requ

irin

gla

rge

bear

ing.

(8)

Slo

tde

pth

beyo

ndbo

ttom

ofin

dent

atio

non

inde

nted

head

ssh

all

not

bele

ssth

anon

e-th

ird

ofth

em

inim

umsl

otde

pth

spec

ified

.

78


Gag

ing

ri

ng

Sh

ape

of

ind

enta

tio

n

op

tio

nal

[No

te (

1)]

Ind

en

ted

He

ad

W

F

HL

A

W

H

Tabl

e14

BIll

ustr

atio

n

79


Tabl

e14

BD

imen

sion

sof

Type

ICr

oss

Rece

ssed

Inde

nted

Regu

lar

and

Larg

eH

exH

ead

Mac

hine

Scr

ews

Regu

lar

Hea

d[N

ote

(3)]

Larg

eH

ead

[Not

e(3

)]Pr

otru

sion

Rece

ssN

omin

alS

ize

Bey

ond

Wid

thA

cros

sW

idth

Acr

oss

Hea

dPe

netr

atio

nor

Bas

icA

cros

sA

cros

sRe

cess

Gag

ing

Flat

s,A

Flat

s,A

Hei

ght,

Gag

ing

Dep

thS

crew

Corn

ers,

Corn

ers,

Rece

ssD

epth

,Re

cess

Rin

g,[N

ote

(4)]

[Not

e(4

)]H

[Not

e(6

)]D

iam

eter

W,

Min

.W

,M

in.

Dia

met

er,

T,Re

f.W

idth

,D

rive

rF,

Min

.[N

ote

(2)]

Max

.M

in.

[Not

es(4

),(5

)]M

ax.

Min

.[N

otes

(4),

(5)]

Max

.M

in.

M,

Ref.

[Not

e(6

)]N

,Re

f.S

ize

Max

.M

in.

[Not

e(5

)]

10.

0730

0.12

50.

120

0.13

4..

...

...

.0.

044

0.03

60.

072

0.05

20.

014

00.

054

0.03

60.

022

20.

0860

0.12

50.

120

0.13

4..

...

...

.0.

050

0.04

00.

086

0.05

20.

017

10.

054

0.03

60.

024

30.

0990

0.18

80.

181

0.20

2..

...

...

.0.

055

0.04

40.

092

0.05

80.

017

10.

060

0.04

20.

026

40.

1120

0.18

80.

181

0.20

20.

219

0.21

30.

238

0.06

00.

049

0.09

70.

065

0.01

71

0.06

70.

049

0.02

95

0.12

500.

188

0.18

10.

202

0.25

00.

244

0.27

20.

070

0.05

80.

105

0.07

40.

017

10.

076

0.05

80.

035

60.

1380

0.25

00.

244

0.27

2..

...

...

.0.

093

0.08

00.

148

0.08

80.

026

20.

089

0.06

40.

048

80.

1640

0.25

00.

244

0.27

20.

312

0.30

50.

340

0.11

00.

096

0.16

80.

114

0.02

92

0.11

50.

090

0.05

810

0.19

000.

312

0.30

50.

340

...

...

...

0.12

00.

105

0.17

80.

126

0.02

92

0.12

70.

102

0.06

312

0.21

600.

312

0.30

50.

340

0.37

50.

367

0.40

90.

155

0.13

90.

247

0.15

70.

033

30.

152

0.12

70.

083

1 ⁄ 40.

2500

0.37

50.

367

0.40

90.

438

0.42

80.

477

0.19

00.

172

0.27

70.

191

0.03

43

0.18

60.

161

0.10

35 ⁄ 1

60.

3125

0.50

00.

489

0.54

5..

...

...

.0.

230

0.20

80.

359

0.24

20.

055

40.

234

0.21

00.

125

3 ⁄ 80.

3750

0.56

20.

551

0.61

4..

...

...

.0.

295

0.27

00.

387

0.27

50.

062

40.

267

0.24

30.

162

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

14B

Illus

trat

ion

onpr

evio

uspa

ge.

NO

TES

:(1

)A

slig

htro

undi

ngof

all

edge

san

dco

rner

sof

the

hex

surf

aces

ofin

dent

edhe

xhe

ads

shal

lbe

perm

issi

ble

prov

ided

the

diam

eter

ofth

ebe

arin

gci

rcle

iseq

ual

tono

less

than

90%

ofth

esp

ecifi

edm

inim

umw

idth

acro

ssfla

tsdi

men

sion

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Unl

ess

othe

rwis

esp

ecifi

edby

purc

hase

r,re

gula

rhe

xhe

ads

shal

lbe

furn

ishe

d.La

rge

hex

head

sar

ein

tend

edfo

rsc

rew

san

dw

ashe

ras

sem

blie

s(s

ems)

assp

ecifi

edin

ASM

EB

18.1

3,an

dot

her

appl

icat

ions

requ

irin

gla

rge

bear

ing

surf

aces

.(4

)D

imen

sion

sac

ross

flats

and

acro

ssco

rner

sof

the

head

shal

lbe

mea

sure

dat

the

poin

tof

max

imum

met

al.

Tape

rof

side

sof

hex

(ang

lebe

twee

non

esi

dean

dth

eax

is)

shal

lno

tex

ceed

2de

gor

0.00

4in

.,w

hich

ever

isgr

eate

r,th

esp

ecifi

edw

idth

acro

ssfla

tsbe

ing

the

larg

edi

men

sion

.(5

)Th

ero

undi

ngdu

eto

lack

offil

lon

all

six

corn

ers

ofth

ehe

xsh

all

bere

ason

ably

unifo

rman

dth

ew

idth

acro

ssco

rner

ssh

all

besu

chth

atw

hen

ash

arp

ring

havi

ngan

insi

dedi

amet

ereq

ual

toth

esp

ecifi

edm

inim

umw

idth

acro

ssco

rner

sis

plac

edon

the

top

and

bott

omof

the

head

,th

ehe

adsh

all

prot

rude

byan

amou

nteq

ual

to,

orgr

eate

rth

an,

the

Fva

lue

tabu

-la

ted.

See

App

endi

xII

for

acro

ssco

rner

sga

ging

ofhe

xhe

ads.

(6)

The

rece

ssde

pths

and

pene

trat

ions

give

nar

ein

tend

edto

incl

ude

the

dept

hof

the

inde

ntat

ion.

Due

topo

ssib

leva

riat

ions

inth

ein

dent

atio

nde

pths

,th

ere

coul

dbe

vari

atio

nsin

thes

edi

men

sion

s.In

thes

eca

ses,

the

requ

irem

ents

are

tobe

asag

reed

upon

betw

een

the

man

ufac

ture

ran

dhi

scu

stom

er.

80


Gag

ing

rin

g

Tri

mm

ed

or

Fu

lly

Up

se

t H

ea

d

W

F

HL

A

W

H

[No

te (

1)]

Tabl

e14

CIll

ustr

atio

n

81


Tabl

e14

CD

imen

sion

sof

Type

ICr

oss

Rece

ssed

Non

-Ind

ente

dRe

gula

ran

dLa

rge

Hex

Hea

dM

achi

neS

crew

s

Regu

lar

Hea

dLa

rge

Hea

dPr

otru

sion

[Not

e(3

)][N

otes

(3),

(6)]

Nom

inal

Siz

eB

eyon

dW

idth

Acr

oss

Wid

thA

cros

sH

ead

Rece

ssor

Bas

icA

cros

sA

cros

sG

agin

gFl

ats,

AFl

ats,

AH

eigh

t,Pe

netr

atio

nS

crew

Corn

ers,

Corn

ers,

Rece

ssRe

cess

Rece

ssR

ing,

[Not

e(4

)][N

ote

(4)]

HG

agin

gD

epth

Dia

met

erW

,M

in.

W,

Min

.D

iam

eter

,D

epth

,W

idth

,D

rive

rF,

Min

.[N

ote

(2)]

Max

.M

in.

[Not

es(4

),(5

)]M

ax.

Min

.[N

otes

(4),

(5)]

Max

.M

in.

M,

Ref.

T,Re

f.N

,Re

f.S

ize

Max

.M

in.

[Not

e(5

)]

80.

1640

0.25

00.

244

0.27

20.

312

0.30

50.

340

0.11

00.

096

0.18

30.

110

0.03

12

0.11

00.

087

0.05

810

0.19

000.

312

0.30

50.

340

...

...

...

0.12

00.

105

0.19

80.

125

0.03

22

0.12

50.

102

0.06

312

0.21

600.

312

0.30

50.

340

0.37

50.

367

0.40

90.

155

0.13

90.

262

0.14

50.

035

30.

139

0.11

60.

083

1 ⁄ 40.

2500

0.37

50.

367

0.40

90.

438

0.42

80.

477

0.19

00.

172

0.27

70.

160

0.03

63

0.15

40.

131

0.10

35 ⁄ 1

60.

3125

0.50

00.

489

0.54

5..

...

...

.0.

230

0.20

80.

359

0.20

50.

061

40.

196

0.17

40.

125

3 ⁄ 80.

3750

0.56

20.

551

0.61

4..

...

...

.0.

295

0.27

00.

387

0.23

40.

065

40.

225

0.20

30.

162

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

14C

Illus

trat

ion

onpr

evio

uspa

ge.

NO

TES

:(1

)A

slig

htro

undi

ngof

all

edge

san

dco

rner

sof

the

hex

surf

aces

ofin

dent

edhe

xhe

ads

shal

lbe

perm

issi

ble

prov

ided

the

diam

eter

ofth

ebe

arin

gci

rcle

iseq

ual

tono

less

than

90%

ofth

esp

ecifi

edm

inim

umw

idth

acro

ssfla

tsdi

men

sion

.(2

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(3)

Unl

ess

othe

rwis

esp

ecifi

edby

purc

hase

r,re

gula

rhe

xhe

ads

shal

lbe

furn

ishe

d.La

rge

hex

head

sar

ein

tend

edfo

rsc

rew

san

dw

ashe

ras

sem

blie

s(s

ems)

assp

ecifi

edin

ASM

EB

18.1

3,an

dot

her

appl

icat

ions

requ

irin

gla

rge

bear

ing

surf

aces

.(4

)D

imen

sion

sac

ross

flats

and

acro

ssco

rner

sof

the

head

shal

lbe

mea

sure

dat

the

poin

tof

max

imum

met

al.

Tape

rof

side

sof

hex

(ang

lebe

twee

non

esi

dean

dth

eax

is)

shal

lno

tex

ceed

2de

gor

0.00

4in

.,w

hich

ever

isgr

eate

r,th

esp

ecifi

edw

idth

acro

ssfla

tsbe

ing

the

larg

edi

men

sion

.(5

)Th

ero

undi

ngdu

eto

lack

offil

lon

all

six

corn

ers

ofth

ehe

xsh

all

bere

ason

ably

unifo

rman

dth

ew

idth

acro

ssco

rner

ssh

all

besu

chth

atw

hen

ash

arp

ring

havi

ngan

insi

dedi

amet

ereq

ual

toth

esp

ecifi

edm

inim

umw

idth

acro

ssco

rner

sis

plac

edon

the

top

and

bott

omof

the

head

,th

ehe

adsh

all

prot

rude

byan

amou

nteq

ual

to,

orgr

eate

rth

an,

the

Fva

lue

tabu

-la

ted.

See

App

endi

xII

for

acro

ssco

rner

sga

ging

ofhe

xhe

ads.

82


Table 15A Dimensions of Plain and Slotted Hex Washer Head Machine Screws

Width Slot SlotNominal Width ProtrusionAcross Head Washer Washer Width, Depth,Size or Across BeyondFlats, A Height, Diameter, Thickness, J TBasic Screw Corners Gaging Ring,

[Note (5)] H B U [Note (1)] [Notes (1), (7)]Diameter W, Min. F, Min.[Note (4)] Max. Min. [Notes (5), (6)] Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. [Note (6)]

2 0.0860 0.125 0.120 0.134 0.050 0.040 0.166 0.154 0.016 0.010 . . . . . . . . . . . . 0.0243 0.0990 0.125 0.120 0.134 0.055 0.044 0.177 0.163 0.016 0.010 . . . . . . . . . . . . 0.026

4 0.1120 0.188 0.181 0.202 0.060 0.049 0.243 0.225 0.019 0.011 0.039 0.031 0.042 0.025 0.0295 0.1250 0.188 0.181 0.202 0.070 0.058 0.260 0.240 0.025 0.015 0.043 0.035 0.049 0.030 0.0356 0.1380 0.250 0.244 0.272 0.093 0.080 0.328 0.302 0.025 0.015 0.048 0.039 0.053 0.033 0.048

8 0.1640 0.250 0.244 0.272 0.110 0.096 0.348 0.322 0.031 0.019 0.054 0.045 0.074 0.052 0.05810 0.1900 0.312 0.305 0.340 0.120 0.105 0.414 0.384 0.031 0.019 0.060 0.050 0.080 0.057 0.06312 0.2160 0.312 0.305 0.340 0.155 0.139 0.432 0.398 0.039 0.022 0.067 0.056 0.103 0.077 0.083

1⁄4 0.2500 0.375 0.367 0.409 0.190 0.172 0.520 0.480 0.050 0.030 0.075 0.064 0.111 0.083 0.1035⁄16 0.3125 0.500 0.489 0.545 0.230 0.208 0.676 0.624 0.055 0.035 0.084 0.072 0.134 0.100 0.125

3⁄8 0.3750 0.562 0.551 0.614 0.295 0.270 0.780 0.720 0.063 0.037 0.094 0.081 0.168 0.131 0.162


NOTES:(1) Unless otherwise specified by purchaser, hex washer head machine screws are not slotted.(2) Fillet radius R at junction of sides of hex and top of washer shall not exceed 0.15 times the basic screw diameter.(3) A slight rounding of all edges and corners of the hex surfaces shall be permissible.(4) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be

omitted.(5) Dimensions across flats and across corners of the head shall be measured at the point of maximum metal. Taper of

sides of hex (angle between one side and the axis) shall not exceed 2 deg or 0.004 in. whichever is greater, the speci-fied width across flats being the large dimension.

(6) The rounding due to lack of fill on all six corners of the head shall be reasonably uniform and the width across cornersof the head shall be such that when a sharp ring having an inside diameter equal to the specified minimum widthacross corners is placed on the top of the head, the hex portion of the head shall protrude by an amount equal to, orgreater than, the F value tabulated. See Appendix II for across corners gaging of hex heads.

(7) Slot depth beyond bottom of indentation shall not be less than one-third of the minimum slot depth specified.

83


Gag

ing

rin

g

Sh

ape

of

ind

enta

tio

no

pti

on

al

[No

te (

3)]

[No

te (

1)]

W

F

L

A

B

W

HT

U

Tabl

e15

BIll

ustr

atio

n

84


Tabl

e15

BD

imen

sion

sof

Type

ICr

oss

Rece

ssed

Inde

nted

Hex

Was

her

Hea

dM

achi

neS

crew

s

Wid

thRe

cess

Nom

inal

Prot

rusi

onA

cros

sH

ead

Was

her

Was

her

Pene

trat

ion

Siz

eor

Acr

oss

Rece

ssB

eyon

dFl

ats,

AH

eigh

t,D

iam

eter

,Th

ickn

ess,

Gag

ing

Dep

thB

asic

Scr

ewCo

rner

sRe

cess

Dep

th,

Rece

ssG

agin

gR

ing,

[Not

e(4

)]H

BU

[Not

e(6

)]D

iam

eter

W,

Min

.D

iam

eter

,T,

Ref.

Wid

th,

Dri

ver

F,M

in.

[Not

e(2

)]M

ax.

Min

.[N

otes

(4),

(5)]

Max

.M

in.

Max

.M

in.

Max

.M

in.

M,

Ref.

[Not

e(6

)]N

,Re

f.S

ize

Max

.M

in.

[Not

e(5

)]

40.

1120

0.18

80.

181

0.20

20.

060

0.04

90.

243

0.22

50.

019

0.01

10.

097

0.06

50.

017

10.

067

0.04

90.

029

50.

1250

0.18

80.

181

0.20

20.

070

0.05

80.

260

0.24

00.

025

0.01

50.

105

0.07

40.

017

10.

076

0.05

80.

035

60.

1380

0.25

00.

244

0.27

20.

093

0.08

00.

328

0.30

20.

025

0.01

50.

148

0.08

80.

026

20.

089

0.06

40.

048

80.

1640

0.25

00.

244

0.27

20.

110

0.09

60.

348

0.32

20.

031

0.01

90.

168

0.11

40.

029

20.

115

0.09

00.

058

100.

1900

0.31

20.

305

0.34

00.

120

0.10

50.

414

0.38

40.

031

0.01

90.

178

0.12

60.

029

20.

127

0.10

20.

063

120.

2160

0.31

20.

305

0.34

00.

155

0.13

90.

432

0.39

80.

039

0.02

20.

247

0.15

70.

033

30.

152

0.12

70.

083

1 ⁄ 40.

2500

0.37

50.

367

0.40

90.

190

0.17

20.

520

0.48

00.

050

0.03

00.

277

0.19

10.

034

30.

186

0.16

10.

103

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

15B

Illus

trat

ion

onpr

evio

uspa

ge.

NO

TES

:(1

)Fi

llet

radi

usR

atju

ncti

onof

side

sof

hex

and

top

ofw

ashe

rsh

all

not

exce

ed0.

15ti

mes

the

basi

csc

rew

diam

eter

.(2

)A

slig

htro

undi

ngof

all

edge

san

dco

rner

sof

the

hex

surf

aces

shal

lbe

perm

issi

ble.

(3)

Whe

resp

ecif

ying

nom

inal

size

inde

cim

als,

zero

spr

eced

ing

the

deci

mal

and

inth

efo

urth

deci

mal

plac

esh

all

beom

itte

d.(4

)D

imen

sion

sac

ross

flats

and

acro

ssco

rner

sof

the

head

shal

lbe

mea

sure

dat

the

poin

tof

max

imum

met

al.

Tape

rof

side

sof

hex

(ang

lebe

twee

non

esi

dean

dth

eax

is)

shal

lno

tex

ceed

2de

gor

0.00

4in

.,w

hich

ever

isgr

eate

r,th

esp

ecifi

edw

idth

acro

ssfla

tsbe

ing

the

larg

edi

men

sion

.(5

)Th

ero

undi

ngdu

eto

lack

offil

lon

all

six

corn

ers

ofth

ehe

xsh

all

bere

ason

ably

unifo

rman

dth

ew

idth

acro

ssco

rner

ssh

all

besu

chth

atw

hen

ash

arp

ring

havi

ngan

insi

dedi

amet

ereq

ual

toth

esp

ecifi

edm

inim

umw

idth

acro

ssco

rner

sis

plac

edon

the

top

ofth

ehe

ad,

the

head

shal

lpr

otru

deby

anam

ount

equa

lto

,or

grea

ter

than

,th

eF

valu

eta

bula

ted.

See

App

endi

xII

for

acro

ssco

rner

sga

ging

ofhe

xhe

ads.

(6)

The

rece

ssde

pths

and

pene

trat

ions

give

nar

ein

tend

edto

incl

ude

the

dept

hof

the

inde

ntat

ion.

Due

topo

ssib

leva

riat

ions

inth

ein

dent

atio

nde

pths

,th

ere

coul

dbe

vari

atio

nsin

thes

edi

men

sion

s.In

thes

eca

ses,

the

requ

irem

ents

are

tobe

asag

reed

upon

betw

een

the

man

ufac

ture

ran

dhi

scu

stom

er.

85


Gag

ing

rin

g

Sh

ape

of

ind

enta

tio

no

pti

on

al

[No

te (

2)]

[No

te (

1)]

W

F

L

A

B

W

HT

D U

J

Tabl

e15

CIll

ustr

atio

n

86


Tabl

e15

CD

imen

sion

sof

Com

bina

tion

Slo

tted

—Ty

peI

Cros

sRe

cess

edIn

dent

edH

exW

ashe

rH

ead

Mac

hine

Scr

ews

Nom

inal

Prot

rusi

onW

idth

Rece

ssS

ize

orB

eyon

dA

cros

sH

ead

Was

her

Was

her

Slo

tS

lot

Pene

trat

ion

Bas

icA

cros

sRe

cess

Gag

ing

Flat

s,A

Hei

ght,

Dia

met

er,

Thic

knes

s,W

idth

,D

epth

,D

Gag

ing

Dep

thS

crew

Corn

ers

Rece

ssD

epth

,Re

cess

Rin

g,[N

ote

(4)]

HB

UJ

[Not

es(6

),(7

)][N

ote

(6)]

Dia

met

erW

,M

in.

Dia

met

er,

T,Re

f.W

idth

,D

rive

rF,

Min

.[N

ote

(3)]

Max

.M

in.

[Not

es(4

),(5

)]M

ax.

Min

.M

ax.

Min

.M

ax.

Min

.M

ax.

Min

.M

ax.

Min

.M

,Re

f.[N

ote

(6)]

N,

Ref.

Siz

eM

ax.

Min

.[N

ote

(5)]

40.

1120

0.18

80.

181

0.20

20.

060

0.04

90.

243

0.22

50.

019

0.01

10.

039

0.03

10.

042

0.02

40.

097

0.06

50.

017

10.

067

0.04

90.

029

50.

1250

0.18

80.

181

0.20

20.

070

0.05

80.

260

0.24

00.

025

0.01

50.

043

0.03

50.

049

0.02

80.

105

0.07

40.

017

10.

076

0.05

80.

035

60.

1380

0.25

00.

244

0.27

20.

093

0.08

00.

328

0.30

20.

025

0.01

50.

048

0.03

90.

053

0.03

00.

148

0.08

80.

026

20.

089

0.06

40.

048

80.

1640

0.25

00.

244

0.27

20.

110

0.09

60.

348

0.32

20.

031

0.01

90.

054

0.04

50.

074

0.04

80.

168

0.11

40.

029

20.

115

0.09

00.

058

100.

1900

0.31

20.

305

0.34

00.

120

0.10

50.

414

0.38

40.

031

0.01

90.

060

0.05

00.

080

0.05

20.

178

0.12

60.

029

20.

127

0.10

20.

063

120.

2160

0.31

20.

305

0.34

00.

155

0.13

90.

432

0.39

80.

039

0.02

20.

067

0.05

60.

103

0.07

20.

247

0.15

70.

033

30.

152

0.12

70.

083

1 ⁄ 40.

2500

0.37

50.

367

0.40

90.

190

0.17

20.

520

0.48

00.

050

0.03

00.

075

0.06

40.

111

0.07

80.

277

0.19

10.

034

30.

186

0.16

10.

103

GEN

ERA

LN

OTE

S:

(a)

For

addi

tion

alre

quir

emen

ts,

refe

rto

para

.2.

(b)

For

refe

renc

e,se

eTa

ble

15C

Illus

trat

ion

onpr

evio

uspa

ge.

NO

TES

:(1

)Fi

llet

radi

usR

atju

ncti

onof

side

sof

hex

and

top

ofw

ashe

rsh

all

not

exce

ed0.

15ti

mes

the

basi

csc

rew

diam

eter

.(2

)A

slig

htro

undi

ngof

all

edge

san

dco

rner

sof

the

hex

surf

aces

shal

lbe

perm

issi

ble.

(3)

Whe

resp

ecif

ying

nom

inal

size

inde

cim

als,

zero

spr

eced

ing

the

deci

mal

and

inth

efo

urth

deci

mal

plac

esh

all

beom

itte

d.(4

)D

imen

sion

sac

ross

flats

and

acro

ssco

rner

sof

the

head

shal

lbe

mea

sure

dat

the

poin

tof

max

imum

met

al.

Tape

rof

side

sof

hex

(ang

lebe

twee

non

esi

dean

dth

eax

is)

shal

lno

tex

ceed

2de

gor

0.00

4in

.,w

hich

ever

isgr

eate

r,th

esp

ecifi

edw

idth

acro

ssfla

tsbe

ing

the

larg

edi

men

sion

.(5

)Th

ero

undi

ngdu

eto

lack

offil

lon

all

six

corn

ers

ofth

ehe

xsh

all

bere

ason

ably

unifo

rman

dth

ew

idth

acro

ssco

rner

ssh

all

besu

chth

atw

hen

ash

arp

ring

havi

ngan

insi

dedi

amet

ereq

ual

toth

esp

ecifi

edm

inim

umw

idth

acro

ssco

rner

sis

plac

edon

the

top

ofth

ehe

ad,

the

head

shal

lpr

otru

deby

anam

ount

equa

lto

,or

grea

ter

than

,th

eF

valu

eta

bula

ted.

See

App

endi

xII

for

acro

ssco

rner

sga

ging

ofhe

xhe

ads.

(6)

The

rece

ssde

pths

,sl

otde

pths

,an

dpe

netr

atio

nsgi

ven

are

inte

nded

toin

clud

eth

ede

pth

ofth

ein

dent

atio

n.D

ueto

poss

ible

vari

atio

nsin

the

inde

ntat

ion

dept

hs,

ther

eco

uld

beva

ri-

atio

nsin

thes

edi

men

sion

s.In

thes

eca

ses,

the

requ

irem

ents

are

tobe

asag

reed

upon

betw

een

the

man

ufac

ture

ran

dhi

scu

stom

er.

(7)

The

spec

ified

min

imum

slot

dept

hsar

eap

prox

imat

ely

10%

low

erth

ansl

otte

dhe

xw

ashe

rhe

ads.

That

port

ion

ofth

esl

otde

pth

that

pene

trat

esbe

yond

the

bott

omof

the

inde

ntat

ion

shal

lno

tbe

less

than

one

thir

dof

the

min

imum

slot

dept

hsp

ecifi

ed.

87


Table 16A Dimensions of Slotted Round Head Machine Screws

Nominal Size orHead Diameter, Head Height, Slot Width, Slot Depth,Basic Screw

A H J TDiameter[Note (1)] Max. Min. Max. Min. Max. Min. Max. Min.

0000 0.0210 0.041 0.035 0.022 0.016 0.008 0.004 0.017 0.013000 0.0340 0.062 0.056 0.031 0.025 0.012 0.008 0.018 0.012

00 0.0470 0.089 0.080 0.045 0.036 0.017 0.010 0.026 0.018

0 0.0600 0.113 0.099 0.053 0.043 0.023 0.016 0.039 0.0291 0.0730 0.138 0.122 0.061 0.051 0.026 0.019 0.044 0.0332 0.0860 0.162 0.146 0.069 0.059 0.031 0.023 0.048 0.0373 0.0990 0.187 0.169 0.078 0.067 0.035 0.027 0.053 0.040

4 0.1120 0.211 0.193 0.086 0.075 0.039 0.031 0.058 0.0445 0.1250 0.236 0.217 0.095 0.083 0.043 0.035 0.063 0.0476 0.1380 0.260 0.240 0.103 0.091 0.048 0.039 0.068 0.051

8 0.1640 0.309 0.287 0.120 0.107 0.054 0.045 0.077 0.05810 0.1900 0.359 0.334 0.137 0.123 0.060 0.050 0.087 0.06512 0.2160 0.408 0.382 0.153 0.139 0.067 0.056 0.096 0.073

1⁄4 0.2500 0.472 0.443 0.175 0.160 0.075 0.064 0.109 0.0825⁄16 0.3125 0.590 0.557 0.216 0.198 0.084 0.072 0.132 0.099

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.094 0.081 0.155 0.1177⁄16 0.4375 0.750 0.707 0.328 0.307 0.094 0.081 0.196 0.148

1⁄2 0.5000 0.813 0.766 0.355 0.332 0.106 0.091 0.211 0.1599⁄16 0.5625 0.938 0.887 0.410 0.385 0.118 0.102 0.242 0.183

5⁄8 0.6250 1.000 0.944 0.438 0.411 0.133 0.116 0.258 0.1953⁄4 0.7500 1.250 1.185 0.547 0.516 0.149 0.131 0.320 0.242

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9A.(b) For additional requirements, refer to para. 2.


omitted.

88


Table 16B Dimensions of Type I Cross Recessed Round Head Machine Screws

RecessNominal SizeHead Diameter, Head Height, Penetrationor Basic Screw Recess Recess Recess


0 0.0600 0.113 0.099 0.053 0.043 0.066 0.032 0.014 0 0.035 0.0151 0.0730 0.138 0.122 0.061 0.051 0.075 0.042 0.015 0 0.045 0.0262 0.0860 0.162 0.146 0.069 0.059 0.093 0.043 0.017 1 0.046 0.027

3 0.0990 0.187 0.169 0.078 0.067 0.102 0.052 0.018 1 0.055 0.0354 0.1120 0.211 0.193 0.086 0.075 0.111 0.062 0.019 1 0.065 0.0465 0.1250 0.236 0.217 0.095 0.083 0.147 0.060 0.027 2 0.063 0.035

6 0.1380 0.260 0.240 0.103 0.091 0.155 0.070 0.027 2 0.073 0.0458 0.1640 0.309 0.287 0.120 0.107 0.171 0.088 0.030 2 0.090 0.064

10 0.1900 0.359 0.334 0.137 0.123 0.188 0.106 0.031 2 0.108 0.082

12 0.2160 0.408 0.382 0.153 0.139 0.242 0.112 0.032 3 0.108 0.0821⁄4 0.2500 0.472 0.443 0.175 0.160 0.261 0.134 0.034 3 0.130 0.104

5⁄16 0.3125 0.590 0.557 0.216 0.198 0.301 0.174 0.040 3 0.170 0.144

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.380 0.215 0.064 4 0.208 0.1827⁄16 0.4375 0.750 0.707 0.328 0.307 0.395 0.228 0.066 4 0.221 0.196

1⁄2 0.5000 0.813 0.766 0.355 0.332 0.409 0.243 0.068 4 0.236 0.211

9⁄16 0.5625 0.938 0.887 0.410 0.385 0.447 0.278 0.075 4 0.272 0.2455⁄8 0.6250 1.000 0.944 0.438 0.411 0.542 0.297 0.077 5 0.285 0.2443⁄4 0.7500 1.250 1.185 0.547 0.516 0.642 0.398 0.088 5 0.385 0.346

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9B.(b) For additional requirements, refer to para. 2.


omitted.

89


LH

DA

T

M

N

W

Th

is t

ype

of

rece

ss h

as a

larg

e ce

nte

ro

pen

ing

, tap

ered

win

gs,

an

d b

lun

tb

ott

om

, wit

h a

ll ed

ges

rel

ieve

d o

rro

un

ded

. A s

lot

cro

sses

th

e h

ead

alig

ned

wit

h o

ne

pai

r o

f w

ing

s.

Tabl

e16

CD

imen

sion

sof

Com

bina

tion

Slo

tted

—Ty

peI

Cros

sRe

cess

edRo

und

Hea

dM

achi

neS

crew

s

Nom

inal

Hea

dH

ead

Rece

ssS

ize

orD

iam

eter

,H

eigh

t,S

lot

Wid

th,

Slo

tD

epth

,Pe

netr

atio

nB

asic

Scr

ewRe

cess

Rece

ssRe

cess

AH

ND

[Not

e(2

)]G

agin

gD

epth

Dia

met

erD

iam

eter

,D

epth

,W

idth

,D

rive

r[N

ote

(1)]

Max

.M

in.

Max

.M

in.

Max

.M

in.

Max

.M

in.

M,

Ref.

T,Re

f.N

,Re

f.S

ize

Max

.M

in.

00.

0600

0.11

30.

099

0.05

30.

043

0.02

30.

016

0.03

90.

029

0.06

60.

032

0.01

40

0.03

50.

015

10.

0730

0.13

80.

122

0.06

10.

051

0.02

60.

019

0.04

40.

033

0.07

50.

042

0.01

50

0.04

50.

026

20.

0860

0.16

20.

146

0.06

90.

059

0.03

10.

023

0.04

80.

037

0.09

30.

043

0.01

71

0.04

60.

027

30.

0990

0.18

70.

169

0.07

80.

067

0.03

50.

027

0.05

30.

040

0.10

20.

052

0.01

81

0.05

50.

035

40.

1120

0.21

10.

193

0.08

60.

075

0.03

90.

031

0.05

80.

044

0.11

10.

062

0.01

91

0.06

50.

046

50.

1250

0.23

60.

217

0.09

50.

083

0.04

30.

035

0.06

30.

047

0.14

70.

060

0.02

72

0.06

30.

035

60.

1380

0.26

00.

240

0.10

30.

091

0.04

80.

039

0.06

80.

051

0.15

50.

070

0.02

72

0.07

30.

045

80.

1640

0.30

90.

287

0.12

00.

107

0.05

40.

045

0.07

70.

058

0.17

10.

088

0.03

02

0.09

00.

064

100.

1900

0.35

90.

334

0.13

70.

123

0.06

00.

050

0.08

70.

065

0.18

80.

106

0.03

12

0.10

80.

082

120.

2160

0.40

80.

382

0.15

30.

139

0.06

70.

056

0.09

60.

073

0.24

20.

112

0.03

53

0.10

80.

082

1 ⁄ 40.

2500

0.47

20.

443

0.17

50.

160

0.07

50.

064

0.10

90.

082

0.26

10.

134

0.03

43

0.13

00.

104

5 ⁄ 16

0.31

250.

590

0.55

70.

216

0.19

80.

084

0.07

20.

132

0.09

90.

301

0.17

40.

040

30.

170

0.14

4

3 ⁄ 80.

3750

0.70

80.

670

0.25

60.

237

0.09

40.

081

0.15

50.

117

0.38

00.

215

0.06

44

0.20

80.

182

7 ⁄ 16

0.43

750.

750

0.70

70.

328

0.30

70.

094

0.08

10.

196

0.14

80.

395

0.22

80.

066

40.

221

0.19

61 ⁄ 2

0.50

000.

813

0.76

60.

355

0.33

20.

106

0.09

10.

211

0.15

90.

409

0.24

30.

068

40.

236

0.21

19 ⁄ 1

60.

5625

0.93

80.

887

0.41

00.

385

0.11

80.

102

0.24

20.

183

0.44

70.

278

0.07

54

0.27

20.

245

5 ⁄ 80.

6250

1.00

00.

944

0.43

80.

411

0.13

30.

116

0.25

80.

195

0.54

20.

297

0.07

75

0.28

50.

244

3 ⁄ 40.

7500

1.25

01.

185

0.54

70.

516

0.14

90.

131

0.32

00.

242

0.64

20.

398

0.08

85

0.38

50.

346

GEN

ERA

LN

OTE

S:

(a)

Use

ofro

und

head

scre

ws

isno

tre

com

men

ded;

use

pan

head

scre

ws.

See

para

.1.

2.11

and

Tabl

e9C

.(b

)Fo

rad

diti

onal

requ

irem

ents

,re

fer

topa

ra.

2.

NO

TES

:(1

)W

here

spec

ifyi

ngno

min

alsi

zein

deci

mal

s,ze

ros

prec

edin

gth

ede

cim

alan

din

the

four

thde

cim

alpl

ace

shal

lbe

omit

ted.

(2)

Due

toth

eun

derf

illof

mat

eria

lca

used

byth

eco

mbi

nati

onre

cess

,th

em

inim

umsl

otde

pths

are

appr

oxim

atel

y10

%lo

wer

than

slot

ted

roun

dhe

ads.

90


LH

T

M

N

This type of recess has a large center opening, wide straight wings, and blunt bottom, with all edges relieved or rounded.

A

Table 16D Dimensions of Type IA Cross Recessed Round Head Machine Screws



2 0.0860 0.162 0.146 0.069 0.059 0.092 0.050 0.030 1 0.047 0.0314 0.1120 0.211 0.193 0.086 0.075 0.110 0.070 0.030 1 0.067 0.0515 0.1250 0.236 0.217 0.095 0.083 0.142 0.066 0.040 2 0.063 0.0456 0.1380 0.260 0.240 0.103 0.091 0.150 0.074 0.040 2 0.071 0.053

8 0.1640 0.309 0.287 0.120 0.107 0.164 0.089 0.040 2 0.086 0.06810 0.1900 0.359 0.334 0.137 0.123 0.182 0.105 0.040 2 0.105 0.08712 0.2160 0.408 0.382 0.153 0.139 0.234 0.114 0.056 3 0.103 0.085

1⁄4 0.2500 0.472 0.443 0.175 0.160 0.255 0.134 0.056 3 0.126 0.1085⁄16 0.3125 0.590 0.557 0.216 0.198 0.291 0.172 0.056 3 0.162 0.144

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.368 0.223 0.085 4 0.195 0.177

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9D.(b) For additional requirements, refer to para. 2.


omitted.

91


L

D

HA

T

M

W

N

This type of recess has a largecenter opening, wide straight wings, and blunt bottom, withall edges relieved or rounded.A slot crosses the head alignedwith one pair of wings.

Table 16E Dimensions of Combination Slotted — Type IA Cross Recessed Round HeadMachine Screws

Head Head Slot Slot RecessNominal SizeDiameter, Height, Width, Depth, Penetrationor Basic Screw Recess Recess Recess

A H W D [Note (2)] Gaging DepthDiameter Diameter, Depth, Width, Driver[Note (1)] Max. Min. Max. Min. Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. Size Max. Min.

2 0.0860 0.162 0.146 0.069 0.059 0.031 0.023 0.048 0.037 0.092 0.050 0.030 1 0.047 0.0314 0.1120 0.211 0.193 0.086 0.075 0.039 0.031 0.058 0.044 0.110 0.070 0.030 1 0.067 0.0515 0.1250 0.236 0.217 0.095 0.083 0.043 0.035 0.063 0.047 0.142 0.066 0.040 2 0.063 0.0456 0.1380 0.260 0.240 0.103 0.091 0.048 0.039 0.068 0.051 0.150 0.074 0.040 2 0.071 0.053

8 0.1640 0.309 0.287 0.120 0.107 0.054 0.045 0.077 0.058 0.164 0.089 0.040 2 0.086 0.06810 0.1900 0.359 0.334 0.137 0.123 0.060 0.050 0.087 0.065 0.182 0.105 0.040 2 0.105 0.08712 0.2160 0.408 0.382 0.153 0.139 0.067 0.056 0.096 0.073 0.234 0.114 0.056 3 0.103 0.085

1⁄4 0.2500 0.472 0.443 0.175 0.160 0.075 0.064 0.109 0.082 0.255 0.134 0.056 3 0.126 0.1085⁄16 0.3125 0.590 0.557 0.216 0.198 0.084 0.072 0.132 0.099 0.291 0.172 0.056 3 0.162 0.144

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.094 0.081 0.155 0.117 0.368 0.223 0.085 4 0.195 0.177

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9E.(b) For additional requirements, refer to para. 2.



lower than slotted round heads.

92


Table 16F Dimensions of Type II Cross Recessed Round Head Machine Screws

Nominal SizeHead Diameter, Head Height, Recess Penetrationor Basic Screw Recess Recess Recess Driver

A H Gaging DepthDiameter Diameter, Depth, Width, Size[Note (1)] Max. Min. Max. Min. M, Ref. T, Ref. N, Ref. [Note (2)] Max. Min.

0 0.0600 0.113 0.099 0.053 0.043 0.068 0.030 0.020 . . . [Note (3)] [Note (3)]1 0.0730 0.138 0.122 0.061 0.051 0.084 0.040 0.022 . . . [Note (3)] [Note (3)]2 0.0860 0.162 0.146 0.069 0.059 0.100 0.050 0.025 . . . 0.030 0.0203 0.0990 0.187 0.169 0.078 0.067 0.116 0.061 0.027 . . . 0.041 0.030

4 0.1120 0.211 0.193 0.086 0.075 0.131 0.070 0.029 . . . 0.051 0.0395 0.1250 0.236 0.217 0.095 0.083 0.147 0.079 0.032 . . . 0.062 0.0506 0.1380 0.260 0.240 0.103 0.091 0.162 0.089 0.034 . . . 0.072 0.060

8 0.1640 0.309 0.287 0.120 0.107 0.194 0.110 0.039 . . . 0.093 0.08010 0.1900 0.359 0.334 0.137 0.123 0.225 0.125 0.043 . . . 0.114 0.09912 0.2160 0.408 0.382 0.153 0.139 0.256 0.146 0.048 . . . 0.135 0.120

1⁄4 0.2500 0.472 0.443 0.175 0.160 0.297 0.172 0.054 . . . 0.162 0.1465⁄16 0.3125 0.590 0.557 0.216 0.198 0.372 0.213 0.065 . . . 0.212 0.194

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.447 0.262 0.076 . . . 0.262 0.2427⁄16 0.4375 0.750 0.707 0.328 0.307 0.473 0.279 0.080 . . . 0.279 0.258

1⁄2 0.5000 0.813 0.766 0.355 0.332 0.513 0.304 0.086 . . . 0.306 0.2829⁄16 0.5625 0.938 0.887 0.410 0.385 0.593 0.357 0.098 . . . 0.359 0.334

5⁄8 0.6250 1.000 0.944 0.438 0.411 0.632 0.382 0.103 . . . 0.386 0.3583⁄4 0.7500 1.250 1.185 0.547 0.516 0.632 0.382 0.103 . . . 0.386 0.358

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9F.(b) For additional requirements, refer to para. 2.



93


LH

P

A

T

M

This type of recess has a squarecenter opening, slightly taperedside walls, and a conical bottomwith top edges relieved or rounded.

Table 16G Dimensions of Type III Square Recessed Round Head Machine Screws

Recess PenetrationNominal SizeHead Diameter, Head Height, Gaging Depthor Basic Screw Recess Recess Recess

A O [Note (3)]Diameter Across Flats, Depth, Size[Note (1)] Max. Min. Max. Min. M, Ref. T, Ref. [Note (2)] Max. Min.

3 0.0990 0.187 0.169 0.078 0.067 0.070 0.066 0 0.038 0.0284 0.1120 0.211 0.193 0.086 0.075 0.070 0.066 0 0.038 0.0285 0.1250 0.236 0.217 0.095 0.083 0.091 0.106 1R 0.065 0.0506 0.1380 0.260 0.240 0.103 0.091 0.091 0.096 1R 0.065 0.050

8 0.1640 0.309 0.287 0.120 0.107 0.112 0.115 2R 0.075 0.06010 0.1900 0.359 0.334 0.137 0.123 0.112 0.115 2R 0.075 0.06012 0.2160 0.408 0.382 0.153 0.139 0.133 0.143 3R 0.095 0.080

1⁄4 0.2500 0.472 0.443 0.175 0.160 0.133 0.143 3R 0.095 0.0805⁄16 0.3125 0.590 0.557 0.216 0.198 0.191 0.194 4R 0.100 0.085

3⁄8 0.3750 0.708 0.670 0.256 0.237 0.191 0.194 4R 0.100 0.085

GENERAL NOTES:(a) Use of round head screws is not recommended; use pan head screws. See para. 1.2.11 and Table 9G.(b) For additional requirements, refer to para. 2.



depth on finished fasteners due to the build up of plating in the recesses. The recess penetration dimensions specifiedhere are for finished (plated) product. Manufacturers should be advised that they should not use all of this tolerance inthe heading process, or an out of tolerance condition could exist after plating.

94


A

B

J

H

U

T

Table 17A Dimensions of Slotted Round Washer Head Machine Screws

Nominal SizeWasher Head Slot Slotor Basic

Diameter, Height, Width, Depth,Screw Crown WasherB H J TDiameter Diameter, Thickness,

[Note (1)] A, Ref. Max. Min. Max. Min. U, Ref. Max. Min. Max. Min.

4 0.1120 0.177 0.261 0.243 0.079 0.067 0.030 0.039 0.031 0.048 0.0385 0.1250 0.198 0.291 0.272 0.088 0.075 0.040 0.043 0.035 0.053 0.041

6 0.1380 0.218 0.321 0.301 0.096 0.084 0.040 0.048 0.039 0.058 0.0438 0.1640 0.259 0.380 0.358 0.113 0.101 0.040 0.054 0.045 0.067 0.051

10 0.1900 0.300 0.439 0.416 0.130 0.118 0.050 0.060 0.050 0.071 0.05512 0.2160 0.341 0.498 0.473 0.148 0.134 0.050 0.067 0.056 0.085 0.0671⁄4 0.2500 0.395 0.576 0.548 0.170 0.157 0.050 0.075 0.064 0.098 0.083



omitted.

95


LHM

N

A

B

T

U

Table 17B Dimensions of Type I Cross Recessed Round Washer Head Machine Screws

Washer RecessNominal SizeHead Height, Diameter, Penetrationor Basic Screw Crown Washer Recess Recess Recess

H B Gaging DepthDiameter Diameter, Thickness, Diameter, Depth, Width, Driver[Note (1)] A, Ref. Max. Min. Max. Min. U, Ref. M, Ref. T, Ref. N, Ref. Size Max. Min.

2 0.0860 0.136 0.062 0.050 0.202 0.186 0.030 0.099 0.041 0.018 1 0.046 0.0213 0.0990 0.156 0.070 0.058 0.232 0.215 0.030 0.107 0.052 0.019 1 0.056 0.0334 0.1120 0.177 0.079 0.067 0.261 0.243 0.030 0.116 0.062 0.019 1 0.065 0.044

5 0.1250 0.198 0.088 0.075 0.291 0.272 0.040 0.139 0.052 0.026 2 0.054 0.0266 0.1380 0.218 0.096 0.084 0.321 0.301 0.040 0.147 0.058 0.026 2 0.061 0.0338 0.1640 0.259 0.113 0.101 0.380 0.358 0.040 0.161 0.073 0.028 2 0.076 0.048

10 0.1900 0.300 0.130 0.118 0.439 0.416 0.050 0.177 0.091 0.029 2 0.093 0.06612 0.2160 0.341 0.148 0.134 0.498 0.473 0.050 0.228 0.097 0.030 3 0.094 0.0661⁄4 0.2500 0.396 0.170 0.157 0.576 0.548 0.050 0.244 0.110 0.032 3 0.107 0.080

5⁄16 0.3125 0.494 0.211 0.197 0.719 0.687 0.060 0.292 0.160 0.038 3 0.156 0.1293⁄8 0.3750 0.593 0.253 0.238 0.861 0.825 0.060 0.348 0.177 0.058 4 0.170 0.144

7⁄16 0.4375 0.691 0.294 0.278 1.004 0.963 0.070 0.366 0.198 0.061 4 0.190 0.1651⁄2 0.5000 0.790 0.335 0.319 1.146 1.101 0.090 0.383 0.217 0.063 4 0.210 0.184



omitted.

96


Table 18 Dimensions of Square and Hex Machine Screw Nuts

Nominal Size or Width Across Corners Thickness,Basic ThreadWidth Across Flats, F Square, G Hex, G1 HDiameter

[Note (4)] Basic Max. Min. Max. Min. Max. Min. Max. Min.

0 0.0600 5⁄32 0.156 0.150 0.221 0.206 0.180 0.171 0.050 0.0431 0.0730 5⁄32 0.156 0.150 0.221 0.206 0.180 0.171 0.050 0.0432 0.0860 3⁄16 0.188 0.180 0.265 0.247 0.217 0.205 0.066 0.0573 0.0990 3⁄16 0.188 0.180 0.265 0.247 0.217 0.205 0.066 0.057

4 0.1120 1⁄4 0.250 0.241 0.354 0.331 0.289 0.275 0.098 0.0875 0.1250 5⁄16 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.1026 0.1380 5⁄16 0.312 0.302 0.442 0.415 0.361 0.344 0.114 0.102

8 0.1640 11⁄32 0.344 0.332 0.486 0.456 0.397 0.378 0.130 0.11710 0.1900 3⁄8 0.375 0.362 0.530 0.497 0.433 0.413 0.130 0.11712 0.2160 7⁄16 0.438 0.423 0.619 0.581 0.505 0.482 0.161 0.148

1⁄4 0.2500 7⁄16 0.438 0.423 0.619 0.581 0.505 0.482 0.193 0.1785⁄16 0.3125 9⁄16 0.562 0.545 0.795 0.748 0.650 0.621 0.225 0.208

3⁄8 0.3750 5⁄8 0.625 0.607 0.884 0.833 0.722 0.692 0.257 0.239


NOTES:(1) Square machine screw nuts shall have tops and bottoms flat, and un-chamfered. The flat surfaces shall be perpendicu-

lar to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg.(2) Hexagon machine screw nuts shall have top and bottom surfaces flat, with chamfered corners. The flat surface diame-

ters shall be equal to the maximum width across flats, with a tolerance of minus 15%. The bearing surface shall be per-pendicular to the axis of the threaded hole pitch cylinder within a tolerance of 4 deg.

(3) Bottoms of hexagon machine screw nuts may be supplied with flat, but un-chamfered surfaces at the option of the man-ufacturer.

(4) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall beomitted.

97


Table 19 Dimensions of Header Points for Machine ScrewsBefore Threading

NominalPoint Diameter,Nominal Size or Screw Length,

PBasic Screw L, Max.Diameter [Note (2)] Threads per Inch Max. Min. [Note (3)]

2 0.0860 56 0.057 0.050 1⁄264 0.060 0.053 1⁄2

4 0.1120 40 0.074 0.065 1⁄248 0.079 0.070 1⁄2

5 0.1250 40 0.086 0.076 1⁄244 0.088 0.079 1⁄2

6 0.1380 32 0.090 0.080 3⁄440 0.098 0.087 3⁄4

8 0.1640 32 0.114 0.102 136 0.118 0.106 1

10 0.1900 24 0.125 0.112 11⁄432 0.138 0.124 11⁄4

12 0.2160 24 0.149 0.134 13⁄828 0.156 0.141 13⁄8

1⁄4 0.2500 20 0.170 0.153 11⁄228 0.187 0.169 11⁄2

5⁄16 0.3125 18 0.221 0.200 11⁄224 0.237 0.215 11⁄2

3⁄8 0.3750 16 0.270 0.244 11⁄224 0.295 0.267 11⁄2

7⁄16 0.4375 14 0.316 0.287 11⁄220 0.342 0.310 11⁄2

1⁄2 0.5000 13 0.367 0.333 11⁄220 0.399 0.362 11⁄2

GENERAL NOTE: For aditional requirements, refer to para. 2.

NOTES:(1) Edges of point may be rounded and end of point need not be flat nor perpendicular to axis of shank.(2) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal

place shall be omitted.(3) Header points apply to these nominal lengths or shorter. The pointing of longer lengths may require

machining to the dimensions specified.

98

ASME B18.6.3-2003

MANDATORY APPENDIX IPROTRUSION GAGING OF FLAT COUNTERSUNK HEADS

Suitability of flat countersunk head screws, except theNo. 0000, No. 000, and No. 00 sizes, and undercut flatcountersunk head screws, except the No. 0 and No. 1sizes, for application in countersinks designed to theprincipal dimensions of the screws may be determinedby the use of a protrusion gage as illustrated in Fig. I-1.

The gaging dimensions and the gage diameters arespecified in the dimensional tables for flat countersunkhead and undercut flat countersunk head screws. Theprotrusion limits shown in the tables shall apply onlywhen the gaging diameter is exactly as indicated withthe gaging edge of a sharpness obtained by lapping thehole and the top surface of the gage. Any variation in thegaging diameter will require recalculation of protrusionvalues by the original formulas given below:

Maximum protrusion:1,2

Max. F pMax. sharp head diameter − gage hole diameter

2

� tan �90° −Min. head angle

2 �1 Protrusion values shown in dimensional tables were calculated

from these formulas and rounded to the nearest 0.001 in., upwardfor the maximum and downward for the minimum.

2 See formulas for maximum and minimum sharp head diametersin Appendix V.

Fig. I-1 Protusion Gage

99

Minimum protrusion:1, 2

Min. F pMin. sharp head diameter − gage hole diamter

2

� tan �90° −Max. head angle

2 �

or correction of protrusion in accordance with the fol-lowing formula:

F′ p FA − G′A − G

whereF p tabulated protrusion valueF′ p corrected protrusion valueA p head diameter (maximum or minimum for

maximum or minimum protrusion, respec-tively)

G p tabulated gage diameterG′ p measured gage diameter

To ensure adequate service life, the protrusion gageshould be made of tool steel having a hardness of notless than 60 Rockwell C (60 HRC).

ASME B18.6.3-2003

MANDATORY APPENDIX IIACROSS-CORNERS GAGING OF HEX HEADS

Suitability of across-corners dimensions of hex headand hex washer head screws may be determined by theuse of gaging rings as described below.

When the gaging ring is placed on the top of a hexor hex washer head screw, and also the bottom of a hexhead screw, at right angles to the axis of the screw,the head (hex portion of washer head) must protrudebeyond the ring by an amount equal to 60% of the mini-mum head height H. For convenience, the minimumprotrusion values are given in the dimensional tablesfor hex and hex washer head screws.

The gaging ring shall have an inside diameter equalto the tabulated minimum width across-corners, withina tolerance of plus 0.0003 in. The gaging edges of thering shall be sharp and opposite faces shall be parallel.To insure adequate service life, the ring should be madeof tool steel and have a hardness of not less than 60Rockwell C.

A typical gaging fixture is shown in Fig. II-1 with anexplanation of its application; however, any equivalentmeans may be used.

Fig. II-1 Typical Gaging Fixture

100

To check hex head screws from the top, an initialreading shall be taken with the gaging ring placed onthe indexing plate. Then, with the screw placed in thefixture, the gaging ring shall be placed on top of thescrew head and a second reading taken. The differencebetween the two readings is equal to the protrusion Fof the head beyond the gaging ring.

To check hex washer head screws, the gaging proce-dure shall be exactly the same as that for checking hexhead screws from the top. However, in this case thedifference X between the two readings includes thewasher thickness and it is necessary to deduct the actual(measured) thickness of the washer portion from thedifference X to obtain the protrusion F of the hex beyondthe gaging ring.

Gaging the bottom of the head on hex head screwsmay be accomplished in the same manner as gaging thetop, except the ring is placed below the head. The sameprotrusion values shall apply.

ASME B18.6.3-2003

MANDATORY APPENDIX IIIGAGING OF RECESSED HEADS

III-I PENETRATION GAGING

Penetration gaging is a test to determine the suitabilityof recesses in the heads of screws and may be used toindicate deficiencies in the dimensional aspects of therecesses specified in the dimensional tables. (Refer toFigs. III-1, III-2, III-3, and III-4 for illustrations of penetra-tion gages for Types I, IA, II, and III recesses, respec-tively.) Penetrations that are too deep indicate thepossibility of a thin section between head and shank ofscrew, a weakness that might result in twisting-off screwheads during tightening of the screws. Screws with shal-low penetration might result in production problemssuch as reaming of recess or excessive wear on driverbits.

Penetration gaging depth values for the various stylesof recessed heads are included in the dimensional tablesfor the respective heads. These values were predicatedoriginally on the gaging of plain finish (unplated oruncoated) screws. However, subsequent experience hasshown that the Type I and Type II recess penetrationlimits as tabulated, and the Type IA and Type III recesspenetration depths with the tabulated minimum limitreduced by up to 0.005 in., are suitable for the gaging ofscrews having coating thickness of up to and including0.0003 in., on significant surfaces.

This allowance makes up for the loss of depth broughtabout by the plating buildup on the sides of the recess.

Screws having heavier coatings, which fail to meetminimum penetration, must be stripped of finish andgaged for acceptance or rejection in the plain condition.

Specified in Tables III-1 through III-4 are dimensionsof gage points to be used for penetration gaging theType I, Type IA, Type II, and Type III recesses. Thesegage points approach as nearly as possible the perfectdriver form. Also specified are gage heads and bushings,which adapt the gage points to standard dial gages.

Penetration depths for Types I, IA, and II recessesare gaged relative to a reference plane defined by theintersection of the edge of the recess wings with the topsurface of the screw head. This plane is the same as thetop surface on flat head screws, but is somewhat belowthe topmost point on heads with rounded top surfaces.Knife edges or tapered ridges on the gage head are usedto establish the reference plane.

Penetration depths for Type III recesses are gagedrelative to a reference plane defined by the intersectionof the edge of the recess square with the top surface ofthe screw head. This plane is the same as the top surface

101

Fig. III-1 Penetration Gage for Type I Recess

on flat head screws, but may be somewhat below thetopmost point on heads with rounded top surfaces.

A reverse reading indicator is used to determine thepenetration of the gage point into the recess. The gagemay be zeroed on any flat surface.

III-2 FIT GAGING ON TYPE III RECESSES

In addition to the penetration gage, a “Fit” gage isalso required for Type III recesses. Fit gage points aredimensioned in Table III-8. Fit is gaged by the insertionof the gage point into the recess, and a determinationmade as to how well the gage seats into the recess. Thegage should produce a very tight fit with the recess.This is sometimes referred to a “stick fit.“ A lack of thistight fit may indicate a problem with the shape of therecess.

the fit gage and the penetration gage combine to effec-tively determine the suitability of the Type III recess.

ASME B18.6.3-2003 MANDATORY APPENDIX III

Fig. III-2 Penetration Gage for Type IA Recess

Fig. III-3 Penetration Gage for Type II Recess

102

MANDATORY APPENDIX III ASME B18.6.3-2003

Standard dial gage exceptnumerals reading counter-clockwise

Set screw

Gage Point in

Zero Position

Gage Point in

Gaging Position

Screw

Gage head(in section)

Gage point

0 123

45

090

80

7030

20

10

604050

0 123

45

80

7030

20

604050

Fig. III-4 Penetration Gage for Type III Recess

Table III-1 Dimensions of Gage Heads for Type I and IA Recesses

Size of A, B, C, D, E, F, G,Recess Gage (±0.002) (±0.003) (±0.0002) (±0.001) (±0.005) (±0.005) (±0.005)

No. 0 0.008 0.015 0.0460 0.377 0.562 1.688 1.126No. 1 0.012 0.020 0.0880 0.377 0.562 1.688 1.126No. 2 0.018 0.031 0.1420 0.377 0.562 1.688 1.126No. 3 0.022 0.037 0.2100 0.377 0.562 1.688 1.126No. 4 0.031 0.062 0.3130 0.377 0.562 1.688 1.126No. 5 0.041 0.094 0.5010 0.550 0.750 1.896 1.134

103


Tabl

eIII

-2D

imen

sion

sof

Gag

ePo

ints

for

Type

IRe

cess

Siz

eof

Rece

ssG

age

Poin

tD

iam

eter

,A

,(±

0.00

02)

Poin

t,W

idth

B,

(+0.

0000

Leng

th,

C,(±

0.00

5)

Leng

th,

D,

(±0.

005)

Dia

met

er,

E,(±

0.00

5)

Win

gTh

ickn

ess,

F

Max

.M

in.

Poin

tW

idth

,G

,(+

0.00

10

Mill

ing

Ang

le,

H,

(0°

+00

0°

Flat

onEn

d,J

Max

.M

in.

Bas

eFl

ute

Ang

le,

K,(0

°+

150°

)

Sid

eFl

ute

Ang

le,

L,(0

°+

150°

Flut

eW

idth

atB

otto

m,

M,

(+0.

0000

No.

00.

0450

0.02

400.

656

0.78

10.

094

0.01

20.

010

0.03

207°

000.

015

0.01

0[N

ote

(1)]

92°

000.

0151

[Not

e(2

)]N

o.1

0.08

700.

0394

0.68

80.

812

0.15

60.

020

0.01

80.

0500

7°00

0.02

00.

015

138°

0092

°00

0.02

02N

o.2

0.14

100.

0606

0.75

00.

875

0.21

90.

025

0.02

30.

0900

5°45

0.02

00.

015

140°

0092

°00

0.04

34N

o.3

0.20

900.

0983

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104


Table III-3 Dimensions of Gage Points for Type IA Recess

Point Width, Wing Thickness, Point WidthBPoint Diameter, Length, Length, Diameter, F, G,

(at Base of Radius, R)Size of A, C, D, E, (+0.0010 (+0.001Recess Gage (±0.0002) Max. Min. (±0.005) (±0.005) (±0.005) −0.0000) −0.000)

No. 0 0.0450 0.0280 0.0265 0.656 0.781 0.094 0.0165 0.035No. 1 0.0870 0.0438 0.0423 0.688 0.812 0.156 0.0265 0.054No. 2 0.1410 0.0670 0.0655 0.750 0.875 0.219 0.0380 0.095No. 3 0.2090 0.1020 0.1005 0.781 0.906 0.250 0.0530 0.155No. 4 0.3120 0.1520 0.1505 0.844 0.969 0.359 0.0810 0.203No. 5 0.5000 0.2420 0.2400 1.031 1.156 0.531 0.0910 0.315

Rib WingMilling Milling Form Form

Milling Offset Offset Angle, Angle, Flat onAngle, Angle, Angle, L, M, Wing Wing End,

Radius,H, J, K, (0° +07′ (0° +07′ Offset Offset P,RSize of (0° +00′ (0° +06′ (0° +06′ 0° −00′) 0° −00′) Angle, Angle, (+0.005

Recess Gage 0° −06′) 0° −00′) 0° −00′) [Note (1)] [Note (1)] N N1 −0.000) Max. Min.

No. 0 7° 00′ 4° 23′ 7° 45′ 46° 00′ 46° 00′ 22′ 2° 00′ 0.010 0.004 0.003No. 1 7° 00′ 4° 23′ 7° 45′ 46° 00′ 46° 00′ 22′ 2° 00′ 0.015 0.005 0.004No. 2 5° 45′ 3° 00′ 6° 20′ 46° 00′ 46° 00′ 17′ 2° 04′ 0.015 0.008 0.006No. 3 5° 45′ 3° 00′ 6° 20′ 56° 15′ 46° 00′ 17′ 2° 04′ 0.015 0.012 0.008No. 4 7° 00′ 4° 23′ 7° 45′ 56° 15′ 46° 00′ 22′ 2° 00′ 0.015 0.020 0.014No. 5 7° 00′ 4° 23′ 7° 45′ 56° 15′ 46° 00′ 22′ 2° 00′ 0.020 0.040 0.035

NOTE:(1) These dimensions are measured normal to the milling cut.

105


Table III-4 Dimensions of Gage Heads for Type II Recess

D, E,Gage A, B, C, (+0.002 (+0.002

Diameter (±0.0001) (±0.005) (±0.005) −0.000) −0.000)

0.093 0.0930 0.344 0.375 0.030 0.0240.141 0.1410 0.375 0.438 0.046 0.0360.246 0.2460 0.500 0.500 0.062 0.0510.436 0.4360 0.688 0.562 0.094 0.078

106


Table III-5 Dimensions of Gage Points for Type II Recess

Point Milling Side FlutePoint Width, Flat on Radius, Angle, Angle,

Diameter, Diameter, Length, Length, E, End, G, H, J,Gage A, B, C, D, (+0.001 F, (+0.000 (0° +05′ (0° +15′

Diameter (±0.0001) (±0.005) (±0.005) (±0.005) –0.000) (±0.002) –0.001) 0° –00′) 0° –00′)

0.093 0.0926 0.188 0.750 0.875 0.027 0.062 0.005 8° 45′ 90° 00′0.141 0.1406 0.250 0.875 1.000 0.027 0.062 0.005 8° 45′ 90° 00′0.246 0.2456 0.312 0.938 1.062 0.027 0.062 0.005 8° 45′ 90° 00′0.436 0.4356 0.469 1.125 1.250 0.027 0.062 0.005 8° 45′ 90° 00′

GENERAL NOTES:(a) Although these gages may be used interchangeably, showing identical readings on those sizes of screws where dimen-

sion B of gage head is greater than the recess diameter, the following recommendations may be applied: use 0.093gage for recess diameters up to 0.150 in. (it is not practical to gage screw sizes No. 0 and No. 1 having recess diame-ters of less than 0.102 in. maximum); use 0.141 gage for recess diameters of 0.150 and up to 0.270 in.; use 0.246gage for recess diameters of 0.270 and up to 0.460 in.; and use 0.436 gage for recess diameters of 0.460 and up to0.700 in.

(b) For additional reference, see Table III-4 Illustration on previous page.

107


Gage Head

A

0.562 0

0.375

0.25045�

1.688

1/4-20 UNC-2B

1.125

0.875

0

Table III-6 Dimensions for Penetration Gage Heads for Type III Recess

Size of RecessGage 00 0 1 2 3 4

A (+0.0002 0.1015 0.1015 0.1420 0.1615 0.2100 0.2715–0.0002)

F

D

E

C

Grind square to axis Radius

Sharp

BA

90� ± 10�

90� ± 10�

Table III-7 Dimensions of Type III Square Penetration Gage Points

Gage Point Stem Overall Head PointDiameter, Width Across Length, Length, Diameter, Length,

A, Flats, B, C, D, E, F,Size of (+0.0005 (+0.0005 (+0.005 (+0.005 (+0.000 (+0.030

Recess Gage –0.0000) –0.0000) –0.005) –0.005) –0.015) –0.000)

00 0.1005 0.0490 0.785 0.875 0.187 0.0750 0.1005 0.0690 0.785 0.875 0.187 0.1251 0.1405 0.0900 0.785 0.875 0.187 0.1872 0.1605 0.1110 0.785 0.875 0.250 0.1873 0.2085 0.1315 0.785 0.875 0.250 0.1874 0.2705 0.1895 0.785 0.875 0.312 0.212

108


C

B

D

20�

2.5�

A

�0�0��0�15�

Table III-8 Dimensions of Type III Square Fit Gage Points

Across Flats Across Flatsat Point, A Length, DSize of Across Corners, at Top,

Recess Gage Max. Min. B, Ref. C, Ref. Max. Min.

00 0.0500 0.0495 0.0861 0.0609 0.125 0.1050 0.0700 0.0695 0.1153 0.0815 0.145 0.1251 0.0908 0.0903 0.1447 0.1023 0.145 0.1252 0.1121 0.1116 0.1787 0.1263 0.176 0.1563 0.1327 0.1322 0.2117 0.1497 0.207 0.1874 0.1905 0.1900 0.3012 0.2130 0.270 0.250

109

ASME B18.6.3-2003

MANDATORY APPENDIX IVWOBBLE GAGING OF RECESSED HEADS

Wobble gaging provides a means for determining thecompatibility of recesses in the heads of screws withcompanion screw drivers, and will indicate the pointwhere deviations in the recess contours affect satisfac-tory driver engagement. Recesses that exhibit excessivewobble characteristics will result in poor screw drive-ability because of driver camout prior to attaining nor-mal torque level, damage to recesses, and/or accelerateddriver wear.

The allowable total wobble gaging limits for the vari-ous types of recesses included herein were predicatedoriginally on the gaging of plain finish (unplated oruncoated) screws. However, subsequent experience hasshown these limits to be suitable for the gaging of screwshaving coating thickness up to and including 0.0003 in.,on significant surfaces. Screws having heavier coatingsthat fail to meet the wobble gaging requirements mustbe stripped of finish and gaged for acceptance or rejec-tion in the plain condition.

Wobble gaging fixtures, as illustrated in Table IV-1,and appropriate recess master plug gages with handlesand position indicators punch for the respective recesstypes are available through the screw suppliers. Dimen-sions of the points on master plug gages are, except forthe body diameters tabulated herein, the same as thosespecified for the respective gage points in Appendix III.

110

The screw to be gaged shall be placed into the screw-holding chuck and oriented such that one set of recesswings or one side is parallel to the upright back plate.The screw shall be so positioned and the chuck shall betightened sufficiently to prevent any tilting of the screwin the chuck when taking wobble readings.

The position gage pointer and handle with the propermaster plug gage for the recess size being checked shallbe positioned in the slot of the degree scale on the topplate and the point of the plug gage inserted into thescrew recess. It is essential that registry between thecross lines of pointer and the recess wings or side bemaintained. To correct any misalignment, the chuckposition lock screw is loosened, the chuck is rotateduntil registry is obtained, and the chuck is raised orlowered until the gage pointer is flush with the top ofthe degree scale. The chuck position lock screw is thentightened and the readings taken. The gage handle, withdownward pressure applied, is moved from side to sideuntil resistance is encountered and the total readingbetween points of travel of the gage pointer is recorded.The allowable angular wobble limits shall not exceedthe values tabulated in Tables IV-2, IV-3, and IV-4. Crosslines on the gage pointer should be rechecked with pluggage wings or flats to make certain cross lines and gagewings or flats are registered on identical radials.

MANDATORY APPENDIX IV ASME B18.6.3-2003

Table IV-1 Gage Body Diameters

Type IA RecessType I RecessSize ofGround Gage Ground Gage Pressed GageRecess

Gage Max. Min. Max. Min. Max. Min.

No. 0 0.135 0.115 0.135 0.115 . . . . . .No. 1 0.198 0.178 0.198 0.178 0.275 0.255No. 2 0.260 0.240 0.260 0.240 0.275 0.255No. 3 0.323 0.303 0.323 0.303 0.370 0.350No. 4 0.385 0.365 0.385 0.365 0.475 0.455No. 5 0.760 0.740 0.760 0.740 . . . . . .

GENERAL NOTE: Diameters of Type II recess gages are same aspenetration gage points in Appendix III.

Table IV-2 Gaging Limits for Type I and Type IARecesses

Maximum Allowable Total Wobble,Size ofdegRecess

Gage Type I Type IA

No. 0 . . . . . .No. 1 15 12No. 2 12 10No. 3 10 8No. 4 10 8No. 5 10 8

Table IV-3 Gaging Limits for Type II Recess

RecessGage

Diameter Maximum Allowable Total Wobble, deg

0.093 120.141 100.246 80.436 6

Table IV-4 Gaging Limits for Type III Recesses

Recess Size Maximum Allowable Total Wobble, deg

00 60 61 52 43 44 3

GENERAL NOTE: Since Type III Square Drives are meant to be slight“stick” fit on the driver, therefore any wobble may be consideredexcessive by some users. The values shown here are what is feltto be the maximum allowable without affecting drivability. “No Wob-ble” may be specified and agreed to by the manufacturer and thepurchaser prior to the start of production.

111

ASME B18.6.3-2003 MANDATORY APPENDIX IV

Enlarged

Detail

Gage base

Cross lines on endof pointer

Top plate with degreescale calibrated onbasis of 4.250 in. radius

Back plate

Plug gage handleand pointer

Recess masterplug gage

Recessed screwmounted in chuck

Gage body diameter

Chuck for holdingscrew

Chuck position lock screw

WOBBLE G

BLACK LINE

5 DEGREE IN

Fig. IV-1 Wobble Gaging Fixture

112

ASME B18.6.3-2003

MANDATORY APPENDIX VDIMENSIONS FOR NO. 0000, NO. 000, AND NO. 00

THREAD SIZES

The following dimensional data for the No. 0000, No.000, and No. 00 thread sizes is provided in Table V-1for convenient reference until such time as these threadsizes may be adequately documented in an appropriatestandard relating specifically to screw threads.

Table V-1 Dimensions for No. 0000, No. 000, and No. 00 Thread Sizes

Nominal Size Externaland Threads

Major Diameter Pitch Diameterper Inch Series Minor[Note (1)] Designation Class Allowance Max. Min. Max. Min. Tol. Diameter

0000–160 orNS 2 0.0000 0.0210 0.0195 0.0169 0.0158 0.0011 0.0128

0.0210–160

000–120 orNS 2 0.0000 0.0340 0.0325 0.0286 0.0272 0.0014 0.0232

0.0340–120

00–90 orNS 2 0.0000 0.0470 0.0450 0.0398 0.0382 0.0016 0.0326

0.0470–90

00–96 orNS 2 0.0000 0.0470 0.0450 0.0402 0.0386 0.0016 0.0334

0.0470–96

InternalNominal Size

Minor Diameterand Threads Major[Note (2)] Pitch Diameterper Inch Series Diameter,

[Note (1)] Designation Class Min. Max. Min. Max. Tol. Min.

0000–160 or NS 2 . . . . . . 0.0169 0.0181 0.0012 0.02100.0210–160

000–120 or NS 2 . . . . . . 0.0286 0.0300 0.0014 0.03400.0340–120

00–90 or NS 2 . . . . . . 0.0398 0.0414 0.0016 0.04700.0470–90

00–96 or NS 2 . . . . . . 0.0402 0.0418 0.0016 0.04700.0470–96

NOTES:(1) Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal

place shall be omitted.(2) The minor diameter limits for internal threads are not specified; they are determined by the amount

of thread engagement necessary to satisfy the strength requirements and tapping performance in theintended application.

113

ASME B18.6.3-2003

NONMANDATORY APPENDIX AFORMULAS FOR DIMENSIONS

Formulas for the dimensions of head diameter, headheight, and slot depth for various types of head crewsare provided in Tables A-1 through A-14.

Formulas for dimensions of square and hex nuts areprovided in Table A-15.

Table A-1 Flat Countersunk Head Screws

Screw Size Head Diameter

0000 thru 00 No formulas; see tables

0 thru 3⁄8 Max. A (sharp) p 2.040 D – 0.003 ref. [Note (1)]Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)]Max. A (rounded or flat) p 1.920 D – 0.003 [Note (2)]Min. A (rounded or flat) p 1.820 D – 0.013 [Note (2)]Gaging diameter G p 1.830 D – 0.033

7⁄16 Max. A (sharp) p 2.000 D – 0.063 ref. [Note (1)]Min. A (sharp) p 1.920 D – 0.073 ref. [Note (1)]Max. A (rounded or flat) p 1.880 D – 0.063 [Note (2)]Min. A (rounded or flat) p 1.800 D – 0.073 [Note (2)]Gaging diameter G p 1.790 D – 0.093

1⁄2 thru 3⁄4 Max. A (sharp) p 2.000 D – 0.125 ref. [Note (1)]Min. A (sharp) p 1.920 D – 0.135 ref. [Note (1)]Max. A (rounded or flat) p 1.880 D – 0.125 [Note (2)]Min. A (rounded or flat) p 1.800 D – 0.135 [Note (2)]Gaging diameter G p 1.790 D – 0.155

Screw Size Head Height Slot Depth

0000 thru 00 No formulas; see tables No formulas; see tables

0 thru 3⁄8 Max. H p 0.619 D – 0.002 Max. T p 0.288 D – 0.002Min. H p 0.552 D – 0.007 ref. [Note (1)] Min. T p 0.192 D – 0.002

7⁄16 Max. H p 0.596 D – 0.038 Max. T p 0.274 D – 0.017Min. H p 0.529 D – 0.042 ref. [Note (1)] Min. T p 0.184 D – 0.015

1⁄2 thru 3⁄4 Max. H p 0.596 D – 0.075 Max. T p 0.274 D – 0.034Min. H p 0.529 D – 0.078 ref. [Note (1)] Min. T p 0.184 D – 0.027

GENERAL NOTE: D is the basic diameter of the screw.

NOTES:(1) Values no longer tabulated; formulas are retained here for reference purposes only.(2) Values based on a sidewall of approximately 21⁄2% of the head diameter.

114

NONMANDATORY APPENDIX A ASME B18.6.3-2003

Table A-2 Undercut Flat Countersunk Head Screws

Screw Size Head Diameter

0 thru 3⁄8 Max. A (sharp) p 2.040 D – 0.003 ref. [Note (1)]Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)]Max. A (rounded or flat) p 1.920 D – 0.003 [Note (2)]Min. A (rounded or flat) p 1.820 D – 0.013 [Note (2)]Gaging diameter G p 1.830 D – 0.033



Screw Size Head Height Slot Depth

0 thru 3⁄8 Max. H p 0.432 D – 0.001 Max. T p 0.202 D – 0.001Min. H p 0.386 D – 0.005 Min. T p 0.134 D – 0.001

7⁄18 Max. H p 0.417 D – 0.026 Max. T p 0.192 D – 0.012Min. H p 0.370 D – 0.029 Min. T p 0.129 D – 0.011

1⁄2 Max. H p 0.417 D – 0.052 Max. T p 0.192 D – 0.024Min. H p 0.370 D – 0.055 Min. T p 0.129 D – 0.019



Table A-3 100 deg Flat Countersunk Head Screws

Screw Size Head Diameter Head Height Slot Depth

0000 No formulas; see tables No formulas; see tables No formulas; see tablesthru00

0 Max. A (sharp) p 2.040 D – 0.003 ref. Max. H p 0.444 D – 0.001 Max. T p 0.222 D – 0.0005thru [Note (1)] Min. H p 0.396 D – 0.005 ref. Min. T p 0.184 D – 0.004

3⁄8 Min. A (sharp) p 1.960 D – 0.013 ref. [Note (1)][Note (1)]

Max. A (rounded or flat) p 1.920 D – 0.003[Note (2)]

Min. A (rounded or flat) p 1.800 D – 0.013[Note (2)]

Gaging diameter G p 1.790 D – 0.033



115

ASME B18.6.3-2003 NONMANDATORY APPENDIX A

Table A-4 Close Tolerance 100 deg Flat Countersunk Head Screws


0 Max. A (sharp) p 2.040 D − 0.003 ref. Max. H p 0.444 D − 0.001 Max. T p 0.222 D − 0.0005thru [Note (1)] Min. H p 0.396 D − 0.005 ref. Min. T p 0.184 D − 0.004

5⁄8 Min. A (sharp) p 2.000 D − 0.009 ref. [Note (1)][Note (1)]

Max. A (rounded or flat) p 1.920 D − 0.003[Note (2)]

Min. A (rounded or flat) p 1.800 D − 0.013[Note (2)]

Gaging diameter G p 1.790 D − 0.033



Table A-5 Oval Countersunk Head Screws

Screw Size Head Diameter Total Head Height

00 No formulas; see tables No formulas; see tables

0 thru 3⁄8 Max. A (sharp) p 2.040 D − 0.003 ref. [Note (1)] Max. O p 0.923 D + 0.001Min. A (sharp) p 1.960 D − 0.013 ref. [Note (1)] Min. O p 0.820 D − 0.008Max. A (rounded or flat) p 1.920 D − 0.003 [Note (2)]Min. A (rounded or flat) p 1.820 D − 0.013 [Note (2)]Gaging diameter G p 1.830 D − 0.033

7⁄16 Max. A (sharp) p 2.000 D − 0.063 ref. [Note (1)] Max. O p 0.896 D − 0.047Min. A (sharp) p 1.920 D − 0.073 ref. [Note (1)] Min. O p 0.789 D − 0.050Max. A (rounded or flat) p 1.880 D − 0.063 [Note (2)]Min. A (rounded or flat) p 1.800 D − 0.073 [Note (2)]Gaging diameter G p 1.790 D − 0.093

1⁄2 thru 3⁄4 Max. A (sharp) p 2.000 D − 0.125 ref. Max. O p 0.896 D − 0.094Min. A (sharp) p 1.920 D − 0.135 ref. Min. O p 0.789 D − 0.094Max. A (rounded or flat) p 1.880 D − 0.125 [Note (2)]Min. A (rounded or flat) p 1.800 D − 0.135 [Note (2)]Gaging diameter G p 1.790 D − 0.155

Screw Size Head Side Height Slot Depth

00 No formulas; see tables No formulas; see tables

0 thru 3⁄8 Max. H p 0.619 D − 0.002 Max. T p 0.556 D − 0.003Min. H p 0.552 D − 0.007 ref. [Note (1)] Min. T p 0.460 D − 0.003

7⁄16 Max. H p 0.596 D − 0.038 Max. T p 0.547 D − 0.029Min. H p 0.529 D − 0.042 ref. [Note (1)] Min. T p 0.466 D − 0.030

1⁄2 thru 3⁄4 Max. H p 0.596 D − 0.075 Max. T p 0.547 D − 0.057Min. H p 0.529 D − 0.078 ref. [Note (1)] Min. T p 0.466 D − 0.055



116


Table A-6 Undercut Oval Countersunk Head Screws(Same as Oval Countersunk Head Except as Shown Below)

Screw Size Total Head Height Head Side Height Slot Depth

0 thru Max. O p 0.736 D + 0.002 Max. H p 0.432 D − 0.001 Max. T p 0.480 D − 0.0013⁄8 Min. O p 0.654 D − 0.006 Min. H p 0.386 D − 0.005 ref. [Note (1)] Min. T p 0.402 D − 0.002

7⁄16 Max. O p 0.717 D − 0.035 Max. H p 0.417 D − 0.026 Max. T p 0.473 D − 0.023Min. O p 0.630 D − 0.037 Min. H p 0.370 D − 0.029 ref. [Note (1)] Min. T p 0.404 D − 0.023

1⁄2 Max. O p 0.717 D − 0.071 Max. H p 0.417 D − 0.052 Max. T p 0.473 D − 0.033Min. O p 0.630 D − 0.071 Min. H p 0.370 D − 0.055 ref. [Note (1)] Min. T p 0.404 D − 0.033

GENERAL NOTES:(a) Formulas same as for oval countersunk head except as shown above.(b) D is the basic diameter of the screw.

NOTE:(1) Values no longer tabulated; formulas are retained here for reference purposes only.

Table A-7 Pan Head Screws

Head Height

Screw Size Head Diameter Slotted Recessed Slot Depth

0000 No formulas; see tables No formulas; see tables . . . No formulas; see tablesthru00

0 thru Max. A p 1.980 D − 0.003 Max. H p 0.550 D + 0.006 Max. H p 0.692 D + 0.002 Max. T p 0.350 D + 0.00112 Min. A p 1.940 D − 0.012 Min. H p 0.520 D Min. H p 0.652 D − 0.003 Min. T p 0.300 D − 0.004

1⁄4 thru Max. A p 1.980 D − 0.003 Max. H p 0.550 D + 0.006 Max. H p 0.692 D + 0.002 Max. T p 0.293 D + 0.0141⁄2 Min. A p 1.940 D − 0.012 Min. H p 0.520 D Min. H p 0.652 D − 0.001 Min. T p 0.246 D + 0.008

9⁄16 thru Max. A p 2.100 D − 0.140 Max. H p 0.550 D + 0.006 Max. H p 0.692 D + 0.002 Max. T p 0.293 D + 0.0143⁄4 Min. A p 2.000 D − 0.125 Min. H p 0.520 D Min. H p 0.652 D − 0.001 Min. T p 0.246 D + 0.008


Table A-8 Truss Head Screws



0 thru Max. A p 2.440 D − 0.015 Max. H p 0.620 D Max. T p 0.350 D + 0.00112 Min. A p 2.360 D − 0.023 Min. H p 0.570 D − 0.005 Min. T p 0.300 D − 0.004

1⁄4 Max. A p 2.000 D + 0.073 Max. H p 0.520 D + 0.020 Max. T p 0.293 D + 0.014thru Min. A p 1.930 D + 0.063 Min. H p 0.470 D + 0.015 Min. T p 0.246 D + 0.008

3⁄4


117


Table A-9 Fillister Head Screws

Screw Size Head Diameter Total Head Height Slot Depth

0000 No formulas; see tables No formulas; see tables No formulas; see tablesthru 1

2 thru Max. A p 1.670 D − 0.004 Max. O p max. H + max. F Max. T p 0.440 D − 0.0013⁄8 Min. A p 1.610 D − 0.014 Min. O p min. H + min. F Min. T p 0.374 D − 0.007

7⁄16 Max. A p 1.000 D + 0.188 Max. O p max. H + max. F Max. T p 0.500 (min. O) + 0.010Min. A p 0.940 D + 0.178 Min. O p min. H + min. F Min. T p max. T − 0.066 D − 0.005

1⁄2 thru Max. A p 1.000 D + 0.250 Max. O p max. H + max. F Max. T p 0.500 (min. O) + 0.0103⁄4 Min. A p 0.940 D + 0.240 Min. O p min. H + min. F Min. T p max. T − 0.066 D − 0.005

Screw Size Head Side Height Oval Height

0000 No formulas; see tables No formulas; see tablesthru 1

2 thru Max. H p 0.660 D + 0.005 Max. F p 0.280 D − 0.0033⁄8 Min. H p 0.622 D Min. F p 0.240 D − 0.008

7⁄16 Max. H p 0.550 D + 0.022 Max. F p 0.220 D + 0.006Min. H p 0.510 D + 0.017 Min. F p 0.180 D + 0.001

1⁄2 thru Max. H p 0.550 D + 0.027 Max. F p 0.220 D + 0.0083⁄4 Min. H p 0.510 D + 0.022 Min. F p 0.180 D + 0.003


Table A-10 Drilled Fillister Head Screws

Screw Size Head Diameter Total Head Height Head Side Height Oval Height

0 thru 3⁄8 Max. A p 1.670 D − 0.004 Max. O p max. H + max. F Max. H p 0.660 D + 0.005 Max. F p 0.280 D − 0.003Min. A p 1.610 D − 0.014 Min. O p min. H + min. F Min. H p 0.645 D Min. F p 0.265 D − 0.008


118


Table A-11 Binding Head Screws

Screw Size Head Diameter Total Head Height Oval Height


0 thru Max. A p 2.100 D Max. O p 0.700 D − 0.010 Max. F p 0.260 D − 0.0043⁄8 Min. A p 1.990 D Min. O p 0.665 D − 0.014 Min. F p 0.200 D − 0.004

Screw Size Slot Depth Undercut Diameter Undercut Depth


0 thru Max. T p 0.460 D − 0.010 Max. U p 1.640 D Max. X p 0.100 D + 0.0013⁄8 Min. T p 0.390 D − 0.014 Min. U p 1.440 D Min. X p 0.100 D − 0.004


Table A-12 Round Head Screws


0000 thru No formulas; see tables No formulas; see tables No formulas; see tables00

0 thru Max. A p 1.887 D Max. H p 0.645 D + 0.014 Max. T p 0.367 D + 0.0173⁄8 Min. A p 1.813 D − 0.010 Min. H p 0.615 D + 0.006 Min. T p 0.277 D + 0.013

7⁄16 Max. A p 2.000 D − 0.125 Max. H p 0.875 D − 0.055 Max. T p 0.498 D − 0.023Min. A p 1.926 D − 0.135 Min. H p 0.845 D − 0.063 Min. T p 0.380 D − 0.018

1⁄2 and Max. A p 2.000 D − 0.188 Max. H p 0.875 D − 0.082 Max. T p 0.498 D − 0.0389⁄16 Min. A p 1.926 D − 0.198 Min. H p 0.845 D − 0.090 Min. T p 0.380 D − 0.031

5⁄8 and Max. A p 2.000 D − 0.250 Max. H p 0.875 D − 0.109 Max. T p 0.498 D − 0.0533⁄4 Min. A p 1.926 D − 0.260 Min. H p 0.845 D − 0.117 Min. T p 0.380 D − 0.043


119


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120


Table A-14 Slot Width in Slotted Head Screws

Tolerance

Screw Size Basic Width Screw Size Plus Minus

0000 thru No formula; see tables . . . . . . . . .00

0 thru Basic slot width p 0.280 D + 0.004 adjusted to 0 and 1 0.003 0.00410 standard cutter size 2, 3, 4, and 5 0.003 0.005

6 and 8 0.004 0.00510 0.005 0.006

12 thru Basic slot width p 0.160 D + 0.024 adjusted to 12 and 1⁄4 0.005 0.0063⁄4 standard cutter size 5⁄16 0.005 0.007

3⁄8 and 7⁄16 0.005 0.0081⁄2, 9⁄16, and 5⁄8 0.006 0.0093⁄4 0.007 0.009


Table A-15 Machine Screw Nuts

Width Across CornersNut Width Across Flats, Thickness,Size Square and Hex Square Hex Square and Hex

0 thru No formulas; see table Max. G p 1.4142 max. F Max. G p 1.1547 max. F No formulas; see table12 Min. G p 1.373 min. F Min. G p 1.14 min. F

1⁄4 Basic F p 1.500 D + 0.062 Max. G p 1.4142 max. F Max. G p 1.1547 max. F No formulas; see tablethru [Note (1)] Min. G p 1.373 min. F Min. G p 1.14 min. F

3⁄8 Max. F: see tableMin. F: see table

GENERAL NOTE: D is the basic diameter of the thread.

NOTE:(1) Adjusted to sixteenths of an inch.

121

ASME B18.6.3-2003

NONMANDATORY APPENDIX BWRENCH OPENINGS FOR HEX HEAD SCREWS, AND SQUARE

AND HEX NUTS

Dimensions for wrench openings for hex head screws,hex and square machine screw nuts are provided belowin Table B-1.

Table B-1 Wrench Openings for Hex Head Screws, Square, and Hex Nuts

Nominal Sizeof Wrench; Allowance

Nominal Product SizesAlso Basic Between(Maximum) Product Hex and

Hex HeadWidth Across Flats and Hex SquareWrench Openings ScrewsFlats of Screw Jaws of Washer Machine

Head or Nut Wrench Tolerance Regular Large Head Screw[Note (1)] [Note (2)] Min. [Note (2)] Max. Hex Hex Screws Nuts

1⁄8 0.1250 0.002 0.127 0.005 0.132 1 & 2 . . . 2 & 3 . . .5⁄32 0.1562 0.002 0.158 0.005 0.163 . . . . . . . . . 0 & 13⁄16 0.1875 0.002 0.190 0.005 0.195 3, 4, & 5 . . . 4 & 5 2 & 37⁄32 0.2187 0.002 0.220 0.005 0.225 . . . 4 . . . . . .

1⁄4 0.2500 0.002 0.252 0.005 0.257 6 & 8 5 6 & 8 45⁄16 0.3125 0.003 0.316 0.006 0.322 10 & 12 8 10 & 12 5 & 6

11⁄32 0.3438 0.003 0.347 0.006 0.353 . . . . . . . . . 83⁄8 0.3750 0.003 0.378 0.006 0.384 1⁄4 12 1⁄4 10

7⁄16 0.4375 0.003 0.440 0.006 0.446 . . . 1⁄4 . . . 12 & 1⁄41⁄2 0.5000 0.004 0.504 0.006 0.510 5⁄16 . . . 5⁄16 . . .

9⁄16 0.5625 0.004 0.566 0.007 0.573 3⁄8 . . . 3⁄85⁄16

5⁄8 0.6250 0.004 0.629 0.007 0.636 . . . . . . . . . 3⁄8

NOTES:(1) Wrenches shall be marked with the nominal size of wrench, which is equal to the basic (maximum) width across flats

of the corresponding screw head or nut.(2) The allowance (minimum clearance) between maximum width across flats of screw head or nut and jaws of wrench

equals (0.005 W + 0.001). The tolerance on wrench opening equals plus (0.005 W + 0.004 from minimum). W equalsthe nominal size of the wrench.

122

AMERICAN NATIONAL STANDARDS FOR BOLTS, NUTS, RIVETS, SCREWS,WASHERS, AND SIMILAR FASTENERS

Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.1-1972 (R2001)Large Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.2-1972 (R2001)Metric Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.1.3M-1983 (R2001)Square and Hex Bolts and Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.1-1996Square and Hex Nuts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.2-1987 (R1999)Metric Hex Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.1M-1999Metric Formed Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.2M-1979 (R1995)Metric Heavy Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.3M-1979 (R2001)Metric Hex Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.4M-2001Metric Hex Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.5M-1979 (R2001)Metric Heavy Hex Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.6M-1979 (R2001)Metric Heavy Hex Structural Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.7M-1979 (R2001)Metric Hex Lag Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.8M-1981 (R1999)Metric Heavy Hex Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.9M-2001Square Head Bolts (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.10M-1996 (R2003)Metric Hex Nuts, Style 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.1M-2002Metric Hex Nuts, Style 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.2M-1979 (R1995)Metric Slotted Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.3M-1979 (R2001)Metric Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.4M-1982 (R1999)Metric Hex Jam Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.5M-1979 (R2003)Metric Heavy Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.6M-1979 (R2003)Fasteners for Use in Structural Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.6-1996 (R2004)Metric 12-Spline Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.7.1M-2002Clearance Holes for Bolt Screws and Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.8-1999Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.3-2003Socket Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.1M-1986 (R2002)Metric Series Hexagon Keys and Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.2M-1979 (R2003)Hexagon Socket Head Shoulder Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.3M-1986 (R2002)Hexagon Socket Button Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.4M-1986 (R2002)Hexagon Socket Flat Countersunk Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.5M-1986 (R2002)Metric Series Socket Set Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.6M-1986 (R2002)Round Head Bolts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.5-1990 (R2003)Metric Round Head Short Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2.1M-1996 (R2003)Metric Round Head Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2.2M-1982 (R2000)Round Head Square Neck Bolts With Large Head (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2.3M-1990 (R2003)Wood Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.1-1981 (R1997)Slotted Head Cap Screws, Square Head Set Screws, and Slotted Headless Set Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.2-1998Machine Screws and Machine Screw Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.3-2003Thread Forming and Thread Cutting Tapping Screws and Metallic Drive Screws (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.4-1998Metric Thread-Forming and Thread-Cutting Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.5M-2000Metric Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.7M-1999General Purpose Semi-Tubular Rivets, Full Tubular Rivets, Split Rivets and Rivet Caps . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.7-1972 (R2001)Metric General Purpose Semi-Tubular Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.7.1M-1984 (R2000)Clevis Pins and Cotter Pins (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.1-1994 (R2000)Taper Pins, Dowel Pins, Straight Pins, Grooved Pins, and Spring Pins (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.2-1995Spring Pins: Coiled Type, Spring Pins: Slotted, Machine Dowel Pins: Hardened Ground,

and Grooved Pins (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.8.100M-2000Cotter Pins, Headless Clevis Pins, and Headed Clevis Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.8.200M-2000Plow Bolts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.9-1996 (R2003)Track Bolts and Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.10-1982 (R2000)Miniature Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.11-1961 (R2000)Glossary of Terms for Mechanical Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.12-2001Screw and Washer Assemblies — Sems (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.13-1996 (R2003)Screw and Washer Assemblies: Sems (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.13.1M-1998 (R2003)Forged Eyebolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.15-1985 (R2003)

Metric Lifting Eyes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.15M-1998 (R2004)Prevailing-Torque Type Steel Metric Hex Nuts and Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16M-2004Inspection and Quality Assurance for General Purpose Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.1M-1987 (R1999)Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.2M-1987 (R1999)Inspection and Quality Assurance for Special Purpose Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.3M-1987 (R1999)Inspection and Quality Assurance for Fasteners for Highly Specialized Engineered Applications . . . . . . . . . . . . . . . . B18.18.4M-1987 (R1999)Inspection and Quality Assurance Plan Requiring In-Process Inspection and Controls. . . . . . . . . . . . . . . . . . . . . . . . . B18.18.5M-1998 (R2003)Quality Assurance Plan for Fasteners Produced in a Third Party Accreditation System . . . . . . . . . . . . . . . . . . . . . . . . B18.18.6M-1998 (R2003)Quality Assurance Plan for Fasteners Produced in a Customer Approved Control Plan . . . . . . . . . . . . . . . . . . . . . . . . B18.18.7M-1998 (R2003)Lock Washers (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.1-1999Lock Washers (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.21.2M-1999Metric Plain Washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.22M-1981 (R2000)Plain Washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.22.1-1965 (R2003)Part Identifying Number (PIN) Code System for B18 Fastener Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.24-2004Square and Rectangular Keys and Keyways. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.1M-1996 (R2003)Woodruff Keys and Keyways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.2M-1996 (R2003)Square and Rectangular Keys and Keyways: Width Tolerances and

Deviations Greater Than Basic Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25.3M-1998 (R2003)Tapered and Reduced Cross Section Retaining Rings (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.27-1998Helical Coil Screw Thread Inserts (Inch Series) — Free Running and Screw Locking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.29.1-1993 (R2002)Open-End Blind Rivets With Break Mandrels (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.30.1M-2000

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M00403

ASME B18.6.3-2003

ASME B18.6.3-2003 Machine Screws and Machine Screw Nuts

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Transcript of ASME B18.6.3-2003 Machine Screws and Machine Screw Nuts