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है”ह”ह

IS 15274 (2003): Tolerances for Fasteners - Plain Washersfor Bolts, Screws and Nuts - Product Grades A and C [PGD31: Bolts, Nuts and Fasteners Accessories]

IS 15274:20031s0 4759-3:2000

Wwfhm77

@ – Wrw?T, da a?fwwi

Frl?Tf4-mhy**

Indian Standard

TOLERANCES FOR FASTENERS — PLAINWASHERS FOR BOLTS, SCREWS AND NUTS —

PRODUCT GRADES A AND C

ICS 21.060.30

@ 91S 2003

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Februaty 2003 Price Group 3

Bolts, Nuts and Fasteners Accessories Sectional Committee, BP 33

NATIONAL FOREWORD

This Indian Standard which is identical with ISO 4759-3:2000 ‘Tolerances for fasteners — Part 3: Plainwashers for bolts, screws and nuts — Product grades A and C’ issued by the International Organizationfor Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendation ofthe Bolts, Nuts and Fasteners Accessories Sectional Committee and approval of the Basic and ProductionEngineering Division Council.

The text of ISO Standard has been approved as suitable for publication as Indian Standard withoutdeviations. Certain terminology and conventions are, however, not identical to those used in IndianStandards. Attention is drawn especially to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practiceis to use a point ( . ) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their place are listedbelow along with their degree of equivalence for the editions indicated:

International Corresponding Indian Standard Degree ofStandard Equivalence

1s0 1101 : —1) IS 8000 ( Part 1 ) :1985 Geometrical tolerancing on Identicaltechnical drawings : Part 1 Tolerances of formorientation, location and run-out and appropriategeometrical definitions ( first revision)

ISO 2692:1988 IS 8000 ( Part 2 ) : 1993 Technical drawings — doGeometrical tolerances : Part 2 Maximum materialprinciples ( first revision)

ISO 4042:1999 “ IS 1367 ( Part 11 ) :2002 Technical supply conditions dofor threaded steel fasteners : Part 11 Electroplatedcoatings ( third revision )

In reporting the results of a test or analysis made in accordance with this standard, if the final value,observed or calculated, is to be rounded off, it shall be done in accordance with IS 2:1960 ‘Rules forrounding off numerical values ( revised)’.

‘) To be published ( Revision of ISO 1101 :1983 ).

IS 15274:2003ISO 4759-3:2000

Indian Standard

TOLERANCES FOR FASTENERS — PLAINWASHERS FOR BOLTS, SCREWS AND NUTS —

PRODUCT GRADES A AND C

1 Scope

This part of ISO 4759 establishes a selection of tolerances for use in the preparation of ISO product standards forpunched plain washers of product grades A and C, for use with bolts, screws and nuts of nominal thread diametersof from 1 mm to 150 mm inclusive.

it is recommended that these tolerances also be used for non-standard washers.

NOTE The product grade refers to the quality of the product and to the size of the tolerances.

Annex A (informative) presents tolerances taken from ISO 286-1 and ISO 286-2.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions ofthis part of 1S0 4759. For dated references, subsequent amendments to, or revisions of, any of these publicationsdo not apply. However, parties to agreements based on this part of ISO 4759 are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of ISO ~,ld IEC maintainregisters of currently valid International Standards.

ISO 1101 —1 ), Geome?rica/ product specifications (GPS) — Geometrical tolerancing — Tolerances of form,orientation, location and run-out.

ISO 2692:1988: Technical dra wings — Geometrical tolerancing — Maximum material principle.

ISO 4042:1999, Fasteners — Hectrop/ated coatings.

3 Tolerances

The tolerances for plain washers of product grades A and C are given in Table 1.

Unless otherwise specified, the tolerances specified in this part of ISO 4759 apply to washers prior to coating; seealso ISO 4042.

1) To be published. (Revision of ISO 1101:1983)

IS 15274:2003

ISO 4759-3:2000

Deviations from the tolerances specified in this part of ISO 4759 are permitted in product standards only for validtechnical reasons. [n cases where there is a difference between the tolerance requirements in this part of ISO 4759and the product standard, the latter takes precedence.

The tolerances of form and position are specified and indicated according to the definitions of ISO 1101 andISO 2692.

Table 1

Feature Tolerances

Product grades

A c

3.1 Clearance hole (punched) h dl hl h d,

x mm tel. min. mm tel.1, v h<4 H13 0,5 h h<4 H14

\ / I0 d,

i- h>4 H14 0,3 h h>4 H15

x1

w

hl, rollover and fractureRollover and fracture are undefined are undefined but shall

e“ < but shall be present.be present.

Odl z

Key

1 Rollover h, is the part of the hole within the tolerance specified ford,.

2 Fracture

3.2 Outside diameter (punched) h d2 d2

x 1 mm tel. tel.r

r//~1

0 d2h<4 h14

l-- h16

xh>4 h15

0 dz

*

2 /12,rollover and fracture are undefined but present.

h2, is the part of the outer contour within the tolerance

-c <-specified for d2.

1Key

1 Rollover

2 Fracture

2

IS 15274:2003

ISO 4759-3:2000

Table 1 (continued)

TolerancesFeature

Product grades

A c3.3 Thickness h h

tel. tel.

mm mm mm mm

1 I h G 0,5 * 0,05 h G 0,51 rza <1*(),1

It

0,5<h<l &0,1 0,5<h~l &(),2

l<hs 2,5 * (),2 l<h< 2,5 * 0,3

2,5<h<4 * 0,3 2,5<h<4 + 0,6

4<h<6 & (),6 4<h<6 *1

6ch~10 _ 6<hs10 *1,2

10<h <20 -, 10<h <20 *1,6

3.4 Chamfer a= 30” to 45°

~+.m==o,:’2

emin= 0,25 h

3.5 Tolerances of form and position

3.5.1 Thickness variation Ah on the same h Ahpart mm mm

1 I h <0,5 0,025I v/I =1I

to,5<h<l 0,05

x @d . l<h <2,5 0,1 (No requirements)

x— . — 2,5<h<4 0,15

fb~ 4<hs6 0,2.

6<hs10 0,3

NOTE Requirements for Ah apply at a 10<h <20 0,4distance of x = 0,1 (d2- dl)from the edge of the ~hole and the outer edge: i.e. only on 60% of

the ring width.

3

IS 15274:2003

ISO 4759-3:2000

Table 1 (continued)

TolerancesFeature

Product grades

A c

3.5.2 Coaxiality dz tl dz tl

mm mm

+lOtll Ad2 s 50 2 IT12 d2<50 2 IT15

d2 >50 2 IT13 d2 >50 2 IT16

!I

, I

b-

*

)

NOTE Tolerance t,is based on ~mension d2.

3.5.3 Flatness h ~2a

mm mm

Stainless steel excepted

h G 0,5 0,1

0,5<h<l 0,15

l<h G2,5 ,

2,5<hs4 ,

~ “,A , ~jfllm ;:!’:,e Ssst; (No requirements)

h <0,5 0,15

0,5<h<l 0,22

l<h<2,5 0,3

2,5<h G4 0,45

4<h<6 0,6

NOTE Tolerance t2 is always independent of the 6<hs10 0,9thickness tolerance for h.

10<h<20 1,5

a Flatness is measured after removal of burrs,

sta

IS 15274:2003

ISO 4759-3:2000

Annex A(informative)

Tolerances

Standard tolerance grades for IT values are given in table A. 1 and the limit deviations for shafts and holes intables A.2 and A.3, respectively. These tolerances are taken from 1S’0 286-1 and ISO 286-2.

Table A.1 — IT values of standard tolerance grades in millimetres

I Nominal dimensions Standard tolerance grades

over to IT12 IT13 IT15 I IT16

Tolerances

3 0,1 0,14 0,4 0,6

3 6 0,12 0,18 0,48 0,75

6 10 0,15 0,22 0,58 0,9

10 18 0,18 0,27 0,7 1,1

18 30 0,21 0,33 0,84 1,3

30 50 0,25 0,39 1 1,6

50 80 0,3 0,46 1,2 1,9

80 120 0,35 0,54 1,4 2,2

120 180 0,4 0,63 1,6 2,5

180 250 0,46 0,72 1,85 2,9

Table A.2 — Limit deviations for shafts

Nominal dimensions Limit deviations

mm mm

over to h14 h15 h16

30 0

- ;,25 -0,4 -0,6

3 60

-0,3 - ;,48 -:,75

6 100

- ;,36 -0,58 -:,9

10 180 0

-0,43 -:,7 -1,1

18 300 0 0

-0,52 -0,84 -1,3

30 500 0

- ;,62 -1 -1,6

50 800

-:,74 -1,2 - ;9

80 1200 0 0

-0,87 -1,4 -2,2

120 1800

-: -1,6 - ;,5

180 2500

– 1,15 -:85 -:,9

Table A.3 — Limit deviations for holes

Nominal dimensions I Limit deviations

mm I mm

over to H13 H14 H15

I 3 I +0,14 I +0,25 I +0,40 0 0

3 I 6 I +0,18 I i-0,3 + 0,480 QO

6 10+0,22 + 0,36 + 0,58

0 0 0

10 18+ 0,27 + 0,43 + 0,7

0 0 0

18 30+ 0,33 + 0,52 + 0,84

0 0 0

30 I 50 I +0,39 I +0,62I

+1o 0 0

50 I 80 I +0,46 I +0,74 I +1,20 0 0

80 I 120 I +0,54

Ii- 0,87

I+ 1,4

0 0 0

120I

180I

+ 0,63

I

+1

I+ 1,6

0 0 0

180I

250 I +0,72 I +1,15

I

+ 1,850 0 0

IS 15274:2003

ISO 4759-3:2000

Bibliography

[1] ISO 286-1:1988, /S0 sy.stern of limits and fits — Part 1: Bases of tolerances, deviations and fits.

[2] ISO 286-2:1988, /S0 system of /imits and fits — Part 2: Tables of standard to/erance grades and /imitdeviations for holes and shafts.

6

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications maybe reproduced in any form withoutthe prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments ii reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or editiop by referring to the latest issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

Ii

This Indian Standard has been developed from Doc : No. BP 33 ( 0284 ).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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