Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 15276 (2002): Metallic Tube Connections for Fluid Powerand General Use 24° Cone Connectors with O-Ring Weld-OnNipples [PGD 17: Fluid Power Fittings, Hoses and HoseAssemblies]

IS 15276:2002ISO 8434-4:1995

$m’dk7 W7m

Indian Standard

METALLIC TUBE CONNECTIONS FORFLUID POWER AND GENERAL USE

24° CONE CONNECTORS WITH O-RING WELD-ON NIPPLES

ICS 23.100.40

@ BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

December 2002 Price Group 10

IS 15276:20021S0 8434-4:1995

Fluid Power Fittings, Hoses and Hose Assemblies Sectional Committee, BP 17

NATIONAL FOREWORD

This Indian Standard which is identical with ISO 8434-4:1995 ‘Metallic tube connections for fluid powerand general use — Part 4:24° cone connectors with O-ring weld-on nipples’ issued by the InternationalOrganization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendationof the Fluid Power Fittings, Hoses and Hose Assemblies Sectional Committee and approval of theBasic and Production Engineering Division Council.

In fluid power systems, power is transmitted and controlled through a fluid ( liquid or gas ) underpressure within a circuit. In general applications, a fluid maybe conveyed under pressure. Componentsmay be connected through their ports by connections ( fittings ), tubes and hoses. Tubes are rigidconductors, hoses are flexible conductors. 24° cone connectors with O-ring weld-on nipples are usedfor the connection of tubes and hose fittings to ports.

The text of the ISO Standard has been approved as suitable for publication as Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attentionis particularly drawn 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 in the International Standard while in IndianStandards, the current practice is 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 Standard

ISO 48:1994 Rubber, vulcanizedor thermoplastic — Determinationof hardness ( hardness between10 lRHDand IOOIRHD)

ISO 228-1:1994 Pipe threads wherepressure-tight joints are not made onthe threads — Part 1: Dimensions,tolerances and designation

ISO 5598:1985 Fluid power systemsand components — Vocabulary

ISO 6149-1 : 1993 Connections forfluid power and general use — Portsand stud ends with ISO 261 threadsand O-ring sealing — Part 1 : Portswith O-ring seal in truncated housing

Corresponding Indian Standard Degree of Equivalence

IS 3400 ( Part 2 ) :1995 Methods of Technically equivalent

test for vulcanized rubbers : Part 2Hardness ( second revision)

IS 2643:1999 Pipe threads where Identicalpressure-tight joints are not madeon the threads — Dimensions,tolerances and designation ( secondrevision)

IS 10416:1992 Fluid power systems do

and components —Vocabulary ( firstrevision )

IS 13170 ( Part 1 ) :1999 Connections dofor fluid power and general use —Ports and stud ends with ISO 261threads and O-ring sealing :Part 1 Ports with O-ring seal intruncated housing ( first revision)

(i)

IS 15276:2002ISO 8434-4:1995

International Standard

ISO 6149-2:1993 Connections forfluid power and general use — Portsand stud ends with ISO 261 threadsand O-ring sealing — Part 2: Heavyduty ( S series ) stud ends —Dimensions, design, test methodsand requirements

ISO 6149-3:1993 Connections forfluid power and general use — Portsand stud ends with ISO 261 threadsand O-ring sealing — Part 3: Light( L duty series ) stud ends —Dimensions, design, test methodsand requirements

ISO 8434-1 : 1994 Metallic tubeconnections for fluid power andgeneral use — Part 1 :24 degree compression fittings

Corresponding Indian Standard Degree of Equivalence

IS 13170 ( Part 2 ) :1999 Connections Identicalfor fluid power and general use —Ports and stud ends with ISO 261threads and O-ring sealing : Part 2Heavy duty (S series) stud ends —Dimensions, design, test methodsand requirements ( first revision )

IS 13170 ( Part 3 ) :1999 Connectionsfor fluid power and general use —Ports and stud ends with ISO 261threads and O-ring sealing : Part 3Light duty ( L series ) stud ends —Dimensions, design, test methodsand requirements ( first revision)

IS 8805:2002 General requirements Technically equivalentfor ferrule type couplings used inoil-hydraulic systems ( first revision )

do

The Technical Committee responsible for the preparation of this standard has reviewed the provisions ofthe following ISO Standards and has decided that they are acceptable for use in conjunction with thisstandard:

/S0 Standard

ISO 261 :1998

ISC )1127:1992

1s0 1179-1 1,

ISO 1179-2 1)

ISO 3304:1985

ISO 3305:1985

!S0 3601-3:1987

1s0 4397:1993

ISO 4759-1:1978

Tit/e

ISO general-purpose metric screw threads — General plan

Stainless steel tubes — Dimensions, tolerances and conventional massesper unit length

Connections for general use and fluid power — Ports and stud ends withISO 228-1 threads with elastomeric or metal-to-metal sealing — Part 1 :Threaded ports

Connections for general use and fluid power — Ports and stud ends withISO 228-1 threads with elastomeric or metal-to-metal sealing — Part 2:Heavy-duty ( S series) and light-duty ( L series ) stud ends with elastomericsealing ( type E )

Plain and seamless precision steel tubes —Technical conditions for delivery

Plain and welded precision steel tubes — Technical conditions for delivery

Fluid systems — Sealing devices — O-ring — Part 3: Quality acceptancecriteria

Fluid power systems and components — Connectors and associatedcomponents — Nominal outside diameters of tubes and nominal inside diametersof hoses

Tolerances for fasteners — Part 1 : Bolts, screws and nuts with threaddiameters between 1.6 ( inclusive ) and 150 mm ( inclusive ) and productgrades A, B and C

‘) To be published.

(ii)

IS 15276:2002ISO 8434-4:1995

ISO Standard Title

ISO 9227:1990 Corrosion tests in artificial atmospheres — Salt spray tests

ISO 9974-1:1996 Connections for general use and fluid power — Ports and stud ends withISO 261 threads with elastomeric or metal-to-metal sealing — Part 1: Threadedports

ISO 9974-2:1996 Connections for general use and fluid power — Ports and stud ends withISO 261 threads with elastomeric or metal-to-metal sealing — Part 2: Studends with elastomeric sealing ( type E )

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis shall be rounded off in accordancewith IS 2:1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant placesretained in the rounded off value should be the same as that of the specified value in this standard.

( iii)

IS 15276:2002ISO 8434-4:1995

Indian Standard

METALLIC TUBE CONNECTIONS FORFLUID POWER AND GENERAL USE

24° CONE CONNECTORS WITH O-RING WELD-ON NIPPLES

1 Scope

This part of ISO 8434 specifies general and dimen-sional requirements for the design and performanceof 24° cone connectors with O-ring weld-on nipplesthat are suitable for use with steel and stainless steeltubes with outside diameters from 6 mm to 42 mm,inclusive. These fittings are for use in fluid power andgeneral applications where elastomeric seals can beused, within the limits of pressure and temperaturespecified in this part of ISO 8434. S series fittings inaccordance with this part of ISO 8434 may be usedat working pressures up to 63 MPa (630 bar?)). L-series fittings in accordance with this part of ISO 8434may be used at working pressures up to 25 MPa(250 bar) (see table 1).

They are intended for the connection of tubes andhose fittings to ports in accordance with ISO 6149-1,ISO 1179-1 and ISO 9974-1.

NOTES

1 For new designs in hydraulic fluid power applications,see the requirements given in 9.6.

2 For use under conditions outside the pressure and/ortemperature limits specified, see 5.4.

1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mmz

2) To be published. (Revision of ISO 261:1973)

3) To be published.

2 Normative references

The following standards contain provisions which,through reference in this text, constitute provisionsof this part of ISO 8434. At the time of publication, theeditions indicated were valid. All standards are subjectto revision, and parties to agreements based on thispart of ISO 8434 are encouraged to investigate thepossibility of applying the most recent editions of thestandards indicated below. Members of IEC and ISOmaintain registers of currently valid InternationalStandards.

ISO 48:1994, Rubber, vulcanized or thermoplastic —Determination of hardness (hardness between 10lRi-iD and 100 IRHD).

ISO 228-1:1994, Pipe threads where pressure-tightjoints are not made on the threads — Part 1: Dimen-sions, tolerances and designation.

ISO 261 :J), ISO general-purpose metric screwthreads — General plan.

ISO 1127:1992, Stainless steel tubes — Dimensions,tolerances and conventional masses per unit length.

SJ,Connections for general use and fluidIso 1179-1:—power — Ports and stud ends with ISO 228-1 threads

IS 15276:2002ISO 8434-4:1995

with elastomeric or metal-to-metal sealing — Part 1:Threaded ports.

ISO 1179-2:—3), Connections for general use and fluidpower — Ports and stud ends with 1S0 228-1 threadswith elastomeric or metal-to-metal sealing — Part 2.”Heavy-duty (S series) and light-duty (L series) studends with elastomeric sealing (type E).

ISO 3304:1985, Plain end seamless precision steeltubes — Technical conditions for delivew.

ISO 3305:1985, Plain end we/ded precision stee/tubes — Technical conditions for delivery.

ISO 3601-3:1987, F/ujd systems — Sealing devices— O-rings — Part 3: Quality acceptance criteria.

ISO 4397:1993, Fluid power systems and com-ponents — Connectors and associated components— Nominal outside diameters of tubes and nominalinside diameters of hoses.

ISO 4759-1:1978, Tolerances for fasteners — Part 1:Bolts, screws and nuts with thread diameters be-tween 7,6 (inclusive) and 150 mm (inclusive) andproduct grades A, B and C

ISO 5598:1985, F/uid power systems and com-ponents — Vocabulary.

ISO 6149-1:1993, Connections for fluid power andgeneral use — Ports and stud ends with /S0 261threads and O-ring sealing — Part 1: Ports with O-ringseal in truncated housing.

ISO 6149-2:1993, Connections for fluid power andgeneral use — Ports and stud ends with /S0 261threads and O-ring sealing — Part 2: Heavy-duty (Sseries) stud ends — Dimensions, design, test meth-ods and requirements.

ISO 6149-3:1993, Connections for f/uid power andgeneral use — Ports and stud ends with ISO 261threads and O-ring sealing — Part 3: Light-duty (Lseries) stud ends — Dimensions, design, test meth-ods and requirements.

ISO 8434-1:1994, Metallic tube connections for fluidpower and general use — Part 1: 24 degree com-pression fittings.

ISO 9227:1990, Corrosion tests in artificia/ atmos-pheres — Sa/t spray tests.

ISO 9974-1 :—3), Connections for general use and fluidpower — Ports and stud ends with /S0 261 threadswith elastomeric or metal-to-metal sealing — Part 1:Threaded ports.

ISO 9974-2:—31, Connections for genera/ use and f/uidpower — Ports and stud ends with ISO 261 threadswith elastomeric or metal-to-metal sealing — Part 2.Stud ends with elastomeric sealing (type E).

3 Definitions

For the purposes of this part ofnitions given in ISO 5598 and theapply.

ISO 8434, the defi-following definitions

3.1 fluid powec Means whereby energy is trans-mitted, controlled and distributed using a pressurizedfluid as the medium.

[ISO 5598]

3.2 connection; fitting: Leakproof device to con-nect pipelines (conductors) to one another, or toequipment.

[ISO 5598]

3.3 fastening thread Terminal thread of a completefitting.

3.4 run: Two principal, axially aligned outlets of a teeor cross.

3.5 branch: Side outlet(s) of a tee or cross.

3.6 chamfen Removal of a conical portion at theentrance of a thread to assist assembly and preventdamage to the start of the thread.

3.7 assembly torque: The torque to be applied inorder to achieve a satisfacto~ final assembly.

3.8 working pressure:paratus is being operated

[ISO 5598]

Pressure at which the sp-in a given application.

4 Requirements for materials

Figure 1 shows the cross-section and componentparts of a typical 24” cone connector with O-ringweld-on nipple.

2

IS 15276:2002ISO 8434-4:1995

Weld-on nipple -1

Figure 1 — Cross-section of typical 2& coneconnector with O-ring weld-on nipple

4.1 Fitting bodies

Bodies shall be manufactured from carbon steel orstainless steel that will provide the minimumpressure/temperature requirements specified inclause 5. They shall have characteristics that makethem suitable for use with the fluid to be conveyedand that will provide an effective joint. Weld-onnipples shall be made of materials classified as suit-able for welding.

4.2 Nuts

Nuts to be used with carbon steel bodies shall bemade of carbon steel and those for use with stainlesssteel bodies shall beotherwise specified.

4.3 O-ri’ngs

made of stainless steel unless

Unless otherwise specified, for use at the pressureand temperature requirements given in clause 5 andtable 1, O-rings for use with fittings in accordancewith this part of ISO 8434 shall be made of NBR(nitrile) with a hardness of (90 & 5) IRHD, measuredin accordance with ISO 48, and shall conform to thedimensions given in table 5 and shall meet or exceedthe O-ring quality acceptance criteria for grade N ofISO 3601-3.

5 Pressure/temperature requirements

5.1 Fittings complying with this part of ISO 8434made of carbon steel and stainless steel shall meetor exceed without leakage the requirements of avacuum of 6,5 kPa (0,065 bar) absolute pressure upto the working pressures given in table 1 when usedat temperatures between – 35 “C and + 100 “C.

5.2 Weld-on nipples in carbon and stainless steelwith different wall thicknesses shall be suitable foruse up to the working pressures given in table 2 whenused at temperatures between – 35 “C and

+ 100 “c.

5.3 Fittings in stainless steel shall be suitable foruse at the working pressures given in tables 1 and 2.For pressure derating for fittings made of stainlesssteel that are to be used at temperatures outside theranges given in 5.1 and 5.2, see table 3.

5.4 For applications under conditions outside thepressure and/or temperature limits given in table 1and in 5.1 to 5.3, the manufacturer shall be consulted.

5.5 According to different applications and differentpressure ratings, there are two series of fittings. Theseries are referred to as

L: light duty

S: heavy duty

Ranges of the tube outside diameters and pressurerequirements are shown in table 1.

5.6 The fitting assembly shall not leak or fail whenhydrostatically tested at four times the applicablerecommended working pressure specified in table 1.Testing shall be conducted at room temperature.

5.7 The pressure/temperature requirements givenin tables 1 to 3 and in 5.1 to 5.6 are for weld-onnipples and fitting bodies only. For port and stud endpressure/temperature requirements, the valuesspecified in the respective port and stud end stan-dards and in annex A of this part of ISO 8434 shallapply.

3

IS 15276:2002ISO 8434-4:1995,

Table 1 — Working pressures for carbon andstainless steel 24ocone connectors with O-ring

weld-on nipples. .

TubeoutsideSeries diameterl) Workingpressure

mm M Pa (bar)

15 25 (250)

L 18 to 22 incl. 16 (160)

28 to 42 incl. 10 (100)

6 to 12 incl, 63 (630)

s 16 to 25 incl, 40 (400)

30 to 38 incl. 25 (250)

NOTE — For higher pressure ratings and for dynamicconditions, the manufacturer shall be consulted.

1) Tube outside diameters per ISO 4397.

6 Designation of fittings

6.1 Fittings shall be designated by an alphanumeric

code to facilitate ordering. They shall be designated

by ISO 8434-4, followed by a spaced hyphen, then the

fitting style letter symbols (see 6.2), followed by a

spaced hyphen, then the series letter (see 5.5) im-mediately followed by the outside diameter of thetube with which they are to be connected, followedby a multiplication sign (x) then the wall thicmess. Forstud ends (connector ends), another spaced hyphenfollowed by the thread designation of the stud endand the sealing type shall be added.

EXAMPLE

A straight stud fitting (SDS) for use with tubing of12 mm OD and 2 mm wall thickness, with anMl 8 x 1,5 stud end in accordance with ISO 6149-2{S series), is designated as follows:

ISO 8434-4- SDS - S12 X 2- NI18

6.2 The letter symbol designation of the fitting styleshall have two parts: the connection end type, im-mediately followed by the shape of the fitting.

6.3 Tube ends are assumed to be male and thus donot need to be included in the code. However, if an-other type of end is involved, it shall be designated.

6.4 Reducing fittings and reducing elbows shall bedesignated by specifying the larger tube end first.

6.5 Stud fittings shall be designated by specifyingthe tube end first, then the thread size for the studend.

6.6 For tee fittings, the order of designation of theconnection ends shall be from larger to smaller on therun, followed by the branch end.

6.7 For cross fittings, the order of designation of theconnection ends shall be from left to right, followedby top to bottom, with the larger ends on the left andat the top.

6.8 If the fitting has a tube union connection, it shallbe designated first, then the designation shall proceedclockwise.

6.9 The following letter symbols shall be used:

Connection end type Letter

Bulkhead BH

Swivel Sw

Weld-on WD

Weld-in WI

Port P

Stud SD

Reducing RE

Shape Letter

Straight s

Elbow E

Tee T

Run tee RT

Branch tee BT

Cross K

Component type Letter

Nut N

Locknut LN

Nipple NP

Examples of compression fittings and designationsare given in figures 2 to 7.

4

IS 15276:2002ISO 8434-4:.1995

Table 2 — Working pressures for carbon and stainless steel weld-on nipples with various tube wallthicknesses

Dimensions in mdhmetres

Workingpressure

Series TubeOD1) 10 MPa 16 MPa 25 MPa 31,5 MPa 40 MPa 63 MPa(100 bar) (160 bar) (250 bar) (31 5 bar) (400 bar) (630 bar)

42) ~ 3) 4 e 4 e 4 e 4 e 4 e

15 10 2,5 10 2,5 10 2,5

18 13 2,5 13 2,5

L 22 17 2,5 17 2,5

28 23 2,535 29 342 36 3

6 2,5 1,75 2,5 1,75 2,5 1,75 2,5 1,75 2,5 1,75 2,5 1,75

8 4 2 4 2 4 2 4 2 4 2 4 210 6 2 6 2 6 2 6 2 6 2 5 2,5

12 8 2 8 2 8 2 8 2 7 2,5 6 3

s 16 11 2,5 11 2,5 11 2,5 11 2,5 10 320 14 3 14 3 14 3 14 3 12 4

25 19 3 19 3 19 3 17 4 16 4,5

30 24 3 24 3 22 438 32 3 32 3 28 5

NOTE — For pressure and/or temperature applications outside those given in this part of ISO 8434, the manufacturer shallbe consulted.

1) OD = outside diameter

2) 4 = tube inside diameter

3) e = tube wall thickness

Table 3 — Pressure deratings for fittings made from stainless steel and used at temperatures outside theranges given in 5.1 and 5.2

Workingpressurefor temperaturerange

–35°cto+50”c

MPa (bar)

63 (630)

40 (400)

31,5 (31 5)

25 (250)

16 (160)

10 (100)

+1OO”C

MPa (bar)

56,1 (561 )

35,6 (356)

28 (280)

22,3 (223)

14,2 (142)

8,9 (89)

+ 200 “c

MPa (bar)

50,4 (504)

32 (320)

25 (250)

20 (200)

12,8 (128)

8 (80)

NOTE — Intermediate values may be interpolated.

5

IS 15276:2002ISO 8434-4:1995

ISO 8434-4- S - S20 X 3

Figure 2 — Straight fitting

ISO 8434-4- SDS - S20 X 3- M18

Figure 3 — Straight stud fitting

).—.—\

ISO 8434-4- S - I-22 X 2,5

Figure 4 — Tee

IS 15276:2002ISO 8434-4:1995

7 Requirements for tubes

Carbon steel tubes shall comply with ISO 3304 orISO 3305 (cold-drawn and annealed or normalized).Stainless steel tubes shall comply with ISO 1127

.-(cold-drawn and annealed or normalized).

8 Across-flats dimensions

8.1 The dimensions across flats for nuts and on thebodies of the fittings shall be as given in tables 6 to9. For sizes up to and including 24 mm, tolerances foracross-flats dimensions for forgings shall be _~,e mm.For sizes larger than 24 mm they shall be _~ mm.

8.2 Hex tolerances across flats shall be in accord-ance with ISO 4759-1:1978, product grade C. Mini-

1S0 8434-4- E - S20 X 3 mum across-corner hex dimensions are 1,092 timesthe width across flats. The minimum side flat is 0,43

Figure 5 — Elbow times the nominal width across flats. Unless other-wise specified or shown, hex corners shall bechamfered 15° to 30” to a diameter equal to the widthacross flats, with a tolerance of _~,dmm.

9 Design

ISO 8434-4- RESW - S20 X 3- !512 X 2

Figure 6 — Reducing swivel adaptor

.-

1S0 8434-4- RESD - S20 X 3- S12 X 2- G 3/8A-E

Figure 7 — Reducing stud fitting

9.1 Fittings

The fittings shall conform to the requirements givenin figures 8 to 17 and tables 4 to 10.

9.2 Dimensions

Dimensions specified apply to finished parts, includingany plating or other treatments. The tolerance valuefor all dimensions not otherwise limited shall be~ 0,4 mm. The sealing seats of fittings shall be con-centric with straight thread pitch diameters within0,25 mm full indicator movement (FIM).

9.3 Passagetolerances

Where passages in straight fittings are machined fromopposite ends, the offset at the meeting point shallnot exceed 0,4 mm. No cross-sectional area at ajunction of passages shall be less than that of thesmallest passage.

9.4 Angular tolerances

Angular tolerances on axis of ends of elbows, teesand crosses shall be * 2,5° for tube sizes 10 mm andless, and + 1,5” for all larger sizes.

IS 15276:2002ISO 8434-4:1995

9.5 Contour details 11 Manufacture

Details of contour shall be chosen by the manufac-turer provided the dimensions given in tables 4 to 10are maintained. Wrench flats on elbows and tees shallconform to the dimensions given in the relevant ta-bles. Abrupt reduction of a section shall be avoided.Junctions of small external sections and adjoiningsections that are relatively heavy shall be blended bymeans of ample fillets.

9.6 Ports and stud ends

The dimensions of stud ends shall conform to thosegiven in ISO 6149-2, ISO 1179-2 or ISO 9974-2 for theS series, and ISO 6149-3, ISO 1179-2 or ISO 9974-2for the L series. For new designs in hydraulic fluidpower applications, only ports and stud ends in ac-cordance with the relevant parts of ISO 6149 shall beused. Ports and stud ends in accordance with therelevant parts of ISO 1179 and ISO 9974 shall not beused for new designs in hydraulic fluid power appli-cations.

10 Screw threads

10.1 Compression ends

The screw threads on the compression ends of thefittings shall be ISO metric in accordance withISO 261.

Threads shall be chamfered at the face of the fittingto an included angle of 45°. The diameter of thechamfer shall be equal to the minor diameter of thethread, with a tolerance of _~,Qmm.

11.1 Workmanship

Workmanship shall conform to the best commercialpractice to produce high-quality fittings. Fittings shallbe free from visual contaminants, all hanging burrs,loose scale and slivers that might be dislodged in useand any other defects that might affect the functionof the parts. All machined surfaces shall have a sur-face roughness value of Ra s 6,3 ~m, except whereotherwise specified.

11.2 Finish

The external surfaces and threads on all fittings, nutsand adaptors, except weld-on fittings and nipples,shall be protected with an appropriate coating to passa minimum 18-h neutral salt spray test in accordancewith ISO 9227, unless otherwise agreed upon by themanufacturer and user. Any appearance of red rustduring the salt spray test shall be considered failure.Fluid passages shall be excluded from the plating orcoating requirements but shall be protected from rust.Weld-on fittings and nipples shall be protected fromcorrosion by an oil film or phosphate coating.

11.3 Shaped fittings

Shaped fittings up to and including size 12 mm tubeoutside diameter may be machined from forgings orbarstock. Shaped fittings larger than size 12 mm tubeoutside diameter shall be made from forgings.

11.4 Corners

Unless otherwise noted, all sharp corners shall bebroken to 0,15 mm max.

10.2 Stud ends (connectionends)

The thread for stud ends (connection ends) of fittingsshall be chosen from ISO 261 (for ISO 6149 orISO 9974 stud ends) or ISO 228-1 (Class A) (forISO 1179 stud ends).

NOTE 3 Parallel threads require an undercut with a seal-ing washer, O-ring or similar device to ensure a leakproofjoint.

10.3 Thread undercuts and recesses

These shall be in accordance with the relevant stud

end standard.

12 Assembly instruction

The assembly of the fittings with the connectingtubes shall be carried out without external loads.

The manufacturer shall draw up assembly instructionsfor the use of the fittings. These instructions shall in-clude at least the following:

— details relating to the material and quality of suit-able tubes;

— details concerning the preparation of the selectedtube;

8

IS 15276:20021S08434-4: 1995

— instructions regarding the assembly of the fitting,

such as the number of wrenching turns or as-

sembly torque.

13 Procurement information

The following information shall be supplied by the

purchaser when making an inquiry or placing an order:

— description of fitting;

— material of fitting;

— material, outside diameter and wall thickness oftube;

— fluid to be conveyed;

— working pressure;

— working temperature.

14 Marking of components

Fitting bodies, weld-on nipples and nuts shall be per-

manently marked with the manufacturer’s name,

trademark or code identifier, unless otherwise agreed

upon by the user and manufacturer. Nuts shall alsobe marked with the tube outside diameter and fittingseries.

15 Identification statement (Reference to

this part of ISO 8434)

Use the following statement in test reports, cata-Iogues and sales literature when electing to complywith this part of ISO 8434:

“Dimensions and design for 24° cone connectors withO-ring weld-on nipples in accordance withISO 8434-4:1995, Metallic tube connections for fluidpower and general use — Part 4: 2P cone connec-tors with O-ring weld-on nipples. ”

IS 15276:2002ISO 8434-4:1995’

Compression end perISO 8434-1 7

Interface is as chosenby the manufacturer

Dimensions in millimetres,surface roughness in micrometres

Tube nut Der

T@’s,oPE

R 0.5

x J--,$2R 0,2

*O

1

24”*O” 30”

I

b\\\\\\\\\\\~ I

~

x

O-ring -J

Type A

Interface is as chosenby the manufacturer

l-mwJ ,“’:::’de

II i\\\\\\\\\\\\~ ..— ../1 .—..—

—

Type B

Figure 8 — Compression end and weld-on nipple details

IS 15276:20021S08434-4: 1995

-------- .––. -–e . . . . .lame 4 — utmensions OTwela-on mppies

Series

L

s

Tube OD

15

18

22

28

35

42

6

8

10

12

16

20

25

30

38

d,

* 0,1

15

18

22

28

35

42

6

8

10

12

16

20

25

30

38

4 ‘)+0,20–0,05

10

13

17

23

29

36

2,5

4

6

8

11

14

19

24

32

min.

18

21

25

31

40

47

9

11

14

16

20

24

29

35

43

4 I d,

max.

20

24

27

33

42

49

11

13

16

18

22

27

33

39

49

max.

17

20

24

30

37,7

44,7

J1,8

1,8

1,8

1,8

NOTE — The dimensions given in this table are for the lowest working pressures given in table 2. Refer to table 2 for tube

7,8

9,8

12

14

18

22,6

27,6

32,7

40,7

L,

* 0,2

22

23

24,5

27,5

30,5

30,5

19

19

20

20

26

28,5

33,5

35,5

39,5

J%

+1

35

37

39,5

42,5

49,5

50

32

32

33,5

33,5

40,5

47

53,5

57,5

64,5

Dimensions in millimetres

k,

+1

28

29,5

32

35

39

39

25

25

26

26

32

36,5

41,5

44

48,5

L4

f 0,1

1#5

1,5

1,5

1,5

1,9

1,9

1,1

1,1

1,1

1,1

1,5

inside diameters and wall thicknesses required for other working pressures.

1) Maximum permissible inside diameter of type A weld-on nipples. If the inside diameter of a tube is larger than~ + 0,5 mm, use of type B weld-on nipples is recommended.

11

lS 15276 :2002ISO 8434-4:1995

Figure 9 — O-ring

Table 5 — Dimensions of O-ringsDimensions in millimetres

Inside diameter Cross-section

Series Tube OD 4 4

nom, tel. nom. tel.

15 12 k 0,18 2 * 0,09

18 15 ~ 0,18 2 * 0,09

22 20 * 0,22 2 * 0,09L

28 26 * 0,22 2 f 0,09

35 32 * 0,31 2,5 * 0,09

42 38 * 0,31 2,5 k 0,09

6 4 * 0,14 1,5 ~ 0,08

8 6 * 0,14 1,5 + 0,08

10 7,5 ~ 0,16 1,5 ~ 0,08

12 9 ~ 0,16 1,5 ~ 0,08

s 16 12 ~ 0,18 2 i 0,09

20 16,3 & 0,18 2,4 * 0,09

25 20,3 * 0,22 2,4 * 0,09

30 25,3 * 0,22 2,4 * 0,09

38 33,3 * 0,31 2,4 * 0,09

NOTE — All designs shall meet the performance requirements of this part of ISO 8434 using O-rings t~ these dimensions.O-rings of other sizes may be used as long as the sealing function is ensured.

12

IS 15276:2002ISO 8434-4:1995

S1 across flats SZacross flats

/

Elastomerend per ISO 1179-2or ISO 9974-2

~ ‘o-ring

1) Aschosen by the manufacturer.

x “

4-“\,,~)---./’

Y “

wL Thrust wire

Figure 10 — S and L series swivel stud straight adaptor (SWSDS) with stud end per ISO 1179-2 or

ISO 9974-2

13

IS15276:2002

ISO

8434-4:1995

Ta

ble

6—

Dim

en

sion

so

fS

an

dL

serie

ssw

ivel

stud

straig

ht

ad

ap

tors

with

stud

en

ds

pe

rIS

O1

17

9-2

or

ISO

99

74

-2

Om

bmlxlw

-..-N

C-

U(-.Y

L *-

WW

CD

WO

W-..

-NN

~mO

NN

CD

WO

KIO

CO

e,--

---N

NC

9C7

IS 15276:2002ISO 8434-4:1995

s, across flots Sz across flats

/

Figure 11 —

O-ring forstud end

ISO 6J69-2L6 (L7) / ‘“U ~.ring

I

L5-1

1) As chosen by the manufacturer: see figure 10.

Swivel stud straight adaptor (SWSDS) with stud end per ISO 6149-2 (S series) or ISO 6149-3(L series)

Table 7 — Dimensions of swivel stud straight adaptors with stud ends per ISO 6149-2 (S series) orISO 6149-3 (L series)

Dimensions In mdllmetres

d,Series

4 d,*Tube OD

J% f% 4 S1 s?

* 0,1 & 0,5 & 0,2

15 M18 x1,5 23,8 10 44 12,5 31,5 24 27

18 M22 X 1,5 26,8 13 44,5 13 31,5 27 32

22L

M27 X 2 31,8 17 48,5 16 32,5 32 36

28 M33 X 2 40,8 22 51 16 35 41 41 1)

35 M42 X 2 49,8 28 WfI 16 42,5 50 50

42 M48 X 2 54,8 34 6& 17,5 46,5 55 60

6 M12 x1,5 16,8 2,5 38 11 27 17 17

8 M14 X 1,5 18,8 4 40,5 \ 11 29,5 19 19

10 M16 x 1,5 21,8 6 44,5 12,5 32 22 22

12 M18x I,5 23,8 8 48 14 34 24 24

s 16 M22 X 1,5 26,8 11 52 15 37 27 30

20 M27 X 2 31,8 14 61,5 18,5 43 32 36

25 M33 X 2 40,8 18 66,5 18,b 48 41 46

30 M42 X 2 49,8 23 70 19 51 50 50

38 M48 X 2 54,8 30 81,5 21,5 60 55 60

1) Alternative hex size: 46 mm. /’

15

IS 15276:2002ISO 8434-4:1995

--40d,2

d Swivel elbow (SWE)

51 across flats

---l R

.s2 across tlats

A0d,2

b) Swive( branch tee (SWBT)

1) As chosen by the manufacturer; see figure 10.

52 across flats

A0d12

d Swivel run tee (SWRT)

O-ring

Figure 12 — Swivel elbow (SWE), swivel branch tee (SWBT) and swivel run tee (SWRT)

16

IS 15276:2002ISO 8434-4:1995

Table 8 — Dimensions of swivel elbows, swivel branch tees and swivel run teesDimensions in miliimetr(.- -.

Seriesd,~ d, ~ k J-s LIO L,,

Tube OD~11)

.72

* 0,5 ~ 0,3 min.

15 12 10 32,5 28 21 9 19 27

18 15 13 35,5 31 23,5 9 24 32

22L

19 17 38,5 35 27,5 10 27 36

28 24 22 41,5 38 30,5 10 36. 41 2)

35 30 28 51 45 34,5 12 41 50

42 36 34 56 51 40 12 50 60

6 4 2,5 27 23 16 9 12 (14) 17

8 5 4 27,5 24 17 9 14 (17) ‘19

10 7’ 6 30 25 17,5 9 17 (19) 22

12 8 8 31 29 21,5 9 17 (22) 24

s 16 12 11 36,5 33 24,5 11 24 30

20 16 14 44,5 37 26,5 12 27 36

25 20 18 50 42 30 14 36 46

30 25 23 55 49 35,5 16 41 50

38 32 30 63 57 41 18 50 60

1) Dimensions in parentheses are for fittings manufactured from barstock.

2) Alternative hex size: 46 mm.

17

IS 15276:2002ISO 8434-4:1995

sz across flats SI across flats

\ /

1) As chosen by the manufacturer: see figure 10,

Figure 13 — Reducing swivel straight adaptor (RESWS)

Table 9 — Dimensions of L and S series reducing swivel straight adaptorsDimensions in millimetres

SeriesWorking pressure Tube OD d10 d12 42 L,3 $ 1) ~2 1)

MPa (bar) OD OD, * 0,5

18 15 12 12 37 9 24 32

16 (160)22

15 12 17 41 918 15 15 41 9

27 36

15 12 22 43 928 18 15 22 43 9 32 (36) 41 (46)

22 19 19 45 10

L 15 12 28 46 9

10 (1 00) 3518 15 28 46 922 19 28 48 10

41 (46) 50

28 24 28 48 10

15 12 34 49,.5 918 15 34 49,5 9

42 22 19 34 51,5 10 50 6028 24 34 51,5 1035 30 34 53,5 12

18

lS 15276 :20021S08434-4: 1995

Series

s

Working pressure

M Pa (bar)

63 (630)

40 (400)

2.5 (250)

1) Alternatwehexsizem parentheses,

Tube OD d10

OD OD1

8 6 4

106 48 5

6 412 8 5

10 7

6 4

168 510 712 8

6 48 5

20 10 712 816 12

6 48 5

2510 712 816 1220 16

6 48 510 7

30 12 816 1220 1625 20

6 48 5

10 7

3812 816 1220 1625 2030 25

61 34,5

-+-l-+-8 I 377 37

11111111

1414141412

181818181816

23232323232320

3030303030303030

39393939

4343434345

45,545,545,545,547,549,5

51515151535557

54;554,554.554,556,558,560,562,5

L 13

9

99

999

9999

999911

99991112

9999111214

999911121416

L.~,1) $2 1)

314 19

17 22

19 24

22 30

27 I 36

-1-32 (36) 46

i

50 60

19

IS 15276:2002ISO 8434-4:1995

\

O-ring

:1

1i11111111I_

I

LSee table 4 and figure 8

Tube nut per ISO 8434-1

7

Figure 14 — Weld-on reducing nipple (WDRE)

Table 10 — Dimensions of L and S series weld-on reducing nipplesIlmenqinnc In milllmaatrsc— --------..- . ,,,,..,,,,-.,--

SeriesWorking pressure Tube OD 4 e 44 L 15 L,6 L 17

MPa (bar) OD OD1 + 0,2 *1 *1

18 15 12 1,5 23 37 29,5 16

16 (160)22

18 15 1,515 12 1,5

24,5 39,5 32 18

22 18 228 18 15 1,5 27,5 42,5

1535

1221

1,5

L 28 24 2

10 (loo) 3522 18 218 15 1,5

30,5 49,5 39 25

15 12 1,5

35 31 228 24 2

42 22 18 2 30,5 5018

3915

281,5

15 12 1,5

.

20

lS 15276 :20021S08434-4: 1995

Series Working pressure Tube OD 4 e L 14 L 15 L 16 L 17

M Pa (bar) OD ODI * 0,2 *1 il

8 6 2 2 19 32 25 11

10 8 363

2,5(630) 6 2 2 20 33,5 26 12

10 4 312 8 3 2,5 20

633,5 26

2 213

12 8 2

1610 6 28 5 1,5 26 40,5 32 15

6 3 1,5

16 10 312 8 2

20 10 6 240 (400)

28,5 47 36,58 5

171,5

6 3 1,5

20 13s

3,516 10 3

2512 8 210 6 2 33,5 53,5 41,5 20

8 5 1,56 3 1,5

25 20 2,520 16 216 12 2

30 12 9 1,5 35,510

57,5 447

221,5

8 5 1,56 4 1

25 (250) 30 24 325 20 2,520 16 2

3816 12 212 9 1,5 39,5 64,5 48,5 26

10 7 1,58 5 1,56 4 1

21

IS 15276:2002ISO 8434-4:1995

a) Tube nut (N)

—

b) Straight fitting (S)

C) Elbow (E)

e) Cross (K)

d) Tee (T)

Figure 15 — Components for use with weld-on nippIes and swivel nut fittings (see ISO 8434-1 fordimensions)

22

IS 15276:20021S08434-4: 1995

a) Stud fitting (SIJS)with stud endwith elastomeric seal per ISO 1179-2

c) Bulkhead straight

b) Stud fitting (SOS) with stud end withO-ring seal per ISO 6149-2 or ISO 6149-3

Iiilfitting (BHS) d) Locknut

e) Bulkhead elbow (BHE)

Figure 16 — Components for use with weld-on nipples and swivel nut fittings (see ISO 8434-1 fordimensions)

-.

a) Weld-on bulkhead fitting (WOBH) b) Weld-on straight fitting (WDS)

Figure 17 — Components for use with weld-on nipples and swivel nut fittings (see ISO 8434-1 fordimensions)

23

IS 15276:2002ISO 8434-4:1995

Annex A(normative)

Port and stud end working pressures and combinations of tube outsidediameters and port and stud end thread sizes

See table A.1 for values for fluid power applications and general use, and table A.2 for values for general use only.

Table A.1 — Values for fluid Dower and aeneral use.

ISO 6149-2 (S series) or ISO 6149-3(L series) with non-adjustable stud ends

ISO 1179-21)

Tube ODSeries

4Thread

Working ThreadWorking

pressurez) pressurez)

mm mm MPa (bar) MPa (bar)

15 10 M18 x 1,5 25 (250) G l/2A 25 (250)

18 13 M22 X 1,5 16 (160) G l/2A 16 (160)

22 17 M27 X 2 16 (160) G 3/4AL

16 (160)

28 23 M33 X 2 10 (100) GIA 10 (100)

35 29 M42 X 2 10 (100) Gil/4A 10 (100)

42 36 M48 X 2 10 (100) Gil/2A 10 (100)

6 2,5 M12 x1,5 63 (630) G l/4A 63 (630)

8 4 M14 X 1,5 63 (630) G1/4A 63 (630)

10 5 M16 x1,5 63 (630) G 3/8A 63 (630)

12 6 M18x I,5 63 (630) G 3/8A 63 (630)

s 16 10 M22 X 1,5 40 (400) G1/2A 40 (400)

20 12 M27 X 2 40 (400) G 3/4A 40 (400)

25 16 M33 X 2 40 (400) GIA 40 (400)

30 22 M42 X 2 25 (250) Gil/4A 25 (250)

38 28 M48 X 2 25 (250) Gil/2A 25 (250)

NOTE — Working pressures are for those fittings where the smallest 4 (inside diameter) is used. See table 2 for workingpressures for fittings with larger A dimensions.

1) Type E with elastomeric sealing.

2) With a design factor of 4 to 1.

24

lS 15276 :2002ISO 8434-4:1995

Table A.2 — Values for general use only

ISO 9974-21)

Tube ODSeries

4

Thread Workingpressurez)

mm mm M Pa (bar)

15 10 M18 x 1,5 25 (250)

18 13 M22 X 1,5 16 (160)

22 17 M26 X 1,5L

16 (160)

28 23 M33 X 2 10 (loo)

35 29 M42 X 2 10 (100)

42 36 M48 X 2 10 (100)

6 2,5 M12 x1,5 63 (630)

8 4 M14 X 1,5 63 (630)

10 5 M16 x 1,5 63 (630)

12 6 M18x I,5 63 (630)

s 16 10 M22 X 1,5 40 (400)

20 12 M27 X 2 40 (400)

25 16 M33 X 2 40 (400)

30 22 M42 X 2 25 (250)

38 28 M48 X 2 25 (250)

NOTE — Working pressures are for those fittings where the smallest ~(inside diameter) is used. See table 2 for working pressures for fittings withlarger ~ dimensions.

1) Type E with elastomeric sealing.

2) With a design factor of 4 to 1.

25

Bureau of Indian Standards

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should ascertain that they are in possession of the latest amendments or edition by referring to the latest issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

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