Disclosure to Promote the Right To Information

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“Step Out From the Old to the New”

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“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 7906-5 (2004): Helical Compression Springs, Part 5: HotCoiled Springs Made from Circular Section Bars [TED 21:Spring]

IS 7906 (Part 5) :2004

VmiRTm. n

Slvl 4 l%kHCt-Akim5”31’m7mnftmr*mqj3fM

mwF@-@Indian Standard

HELICAL COMPRESSION SPRINGSPART 5 HOT COILED SPRINGS MADE FROM CIRCULAR

SECTION BARS — SPECIFICATION

( Second Revision)

ICS 21.160

@ BIS 2004

BUREAU OF IN DIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

septelldxr 2004 Price Group 4

Automotive Springs and Suspension Sectional Committee, TED 21

FOREWORD

This Indian Standard (Part 5) (Second Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Automotive Springs and Suspension Sectional Committee had been approved by the TransportEngineering Division Council.

This standard was originally published in 1979 and revised in 1989. The second revision of the standard wasundertaken as a result of further experience gained in the manufacture and use of the components and otherdevelopments in the field.

The following technical changes have been incorporated:

a) Permissible deviations on nominal diameter of rods with a rolled surface and machined surface.

b) Permissible deviations of spring force.

c) Revision of reference standards which are necessary adjuncts to this standard.

d) Addition of IS 13190:1991 ‘Recommended practice for eddy current examination by rotating probemethod of round steel bars’ which was under preparation earlier.

This standard is one of the series of standards on helical coiled compression springs. The other parts in thisseries are as follows:

(Pm-t 1): 1997

(Part 2): 1997

(Pall 3): 1997

(Part 4): 1987

(Part 6): 1978

(Part 7): 1989

(Part 8): 1989

Design and calculations for springs made from circular section wire and bar

Specification for cold coiled springs made from circular section wire and bar

Data sheet for springs made from circular section wire and bar

Selection of standard cold coiled springs made from circular section wire and bar

Design and calculations for springs made from rectangular section bar steel

Quality requirements for cylindrical coil compression springs, used mainly as vehiclesuspension springs

Method of inspection of hot coiled compression springs made from circular section bars

In the preparation of this standard, assistance has been derived form DIN 2096 Part 1-1991 ‘Helical compressionsprings made of round wire and rod; Quality requirements for hot formed compression springs’, issued by theDeutsches Institut fur Normung (DIN).

The composition of the Committee responsible for the formulation of this standard is given at Annex A.

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

.

(

IS 7906 (Part 5) :2004

Indian Standard

HELICAL COMPRESSION SPRINGSPART 5 HOT COILED SPRINGS MADE FROM CIRCULAR

SECTION BARS — SPECIFICATION

( Second Revision)

1 SCOPE

1.1 This standard (Part 5) covers hot coiledcylindrical compression springs made from round barsteel which are hardened and tempered after coiling.

1.2 This standard is applicable to springs having thefollowing parameters:

a)b)c)d)e)

Bar diameter, d from 8 to 60 mm,Outside diameter, De <460 mm,Unloaded length, & <800 mm,Number of active coils, n c 3, andCoil ratio, w from 3 to 12.

case the lot size exceeds 5 000, then the1.3 Indimensional tolerances as given in IS 7906 (Part 7)shall be applicable.

2 REFERENCES

The following standards contain provisions whichthrough reference in this text, constitute provision ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent editions of the standardsindicated below:

IS No.

1500:1983

2500

(Part 1): 2000

(Part 2): 1965

3195:1992

3431:1982

Title

Method”for Brinell hardness test formetallic materials (second revision)

Sampling inspection procedures

Attribute sampling plans indexedby acceptable quality level (AQL)for lot-by-lot inspection (thirdrevision)

Inspection by variables for percentdefective

Steel for manufacture of volute andhelical springs (for railway rollingstock) (third revision)

.Steel for the manufacture of volute,helical and laminated springs forautomotive suspension (secondrevision)

IS No.

3703:1980

7001:1989

7906(Part 1): 1997

(Part 3): 1975

(Part 7): 1989

13190:1991

Title

Code of practice for magnetic par-ticle flaw detection (first revision)Shot peening of steel parts —Specification (first revision)Helical compression springs:Design and calculations for springsmade from circular section wire andbar (fh-st revision)Data sheet for springs made fromcircular section wire and barQuality requirements for cylindri-cal coil compression springs usedmainly as vehicle suspensionspringsRecommended practice for eddycurrent examination by rotatingprobe method of round steel bars

3 TERMINOLOGY

The following symbols and units shall apply (see also

Fig. 1):

Symbol

AD

Ad

ADe

ADi

AF

ALo

Ant

Term

Permissible deviation of themean coil diameter, D, ofthe unloaded spring

Permissible deviation of thenominal diameter, d

Permissible deviation of theexternal coil diameter, De, ofthe unloaded spring

Permissible deviation of theinternal coil diameter, Di, ofthe unloaded spring

Permissible deviation of thespring force, F, at a specifiedspring length, L

Permissible deviation of the

Unit

mm

mm

mm

mm

N

mmLength, LO,of the unloaded spring

Permissible deviation of the —total number, nt,of turns

1

IS 7906 (Part 5) :2004

Symbol

AR

De+ DiD=-—————

2

De

Di

d

dMax

el

‘2

F, to Fn

Fp

Fc theo

LO

L1 tO Ln

L,

Ln=Lc+S,

Lp

L,

n

nl

~=~

AS

s, tosn

SC=.LO– Lc

Term

Permissible deviation of thespring rate, R

Mean coil diameter

External coil diameter

Internal coil diameter

Wire or rod diameter prior tothe coiling of the spring

Upper deviation of nominaldiameter

Permissible deviation ofgeneratix from the vertical,measured on the unloaded spring(see Fig. 1)

Permissible deviation fromabsolute parallelism of twoground spring ends of theunloaded spring, measured at theexternal diameter, D

e

Spring forces, correlated tothe spring length, L, to Ln

Spring force, correlated to thetest length, Lp

Theoretical spring force, corre-lated to the solid length, Lc

Length of the unloaded spring

Lengths of the loaded spring,correlated to the spring forces,F1 to Fn

Solid length, shortest possiblespring length (all the coils incontact with one another)

Shortest permissible test length

Unit Symbol Term Unit

N/mm S,= Ln – Lc Safety gap, sum of the minimum mm

mm

mm

mm

mm

mm

mm

mm

N

N

N

mm

mm

mm

mm

Length of loaded spring, correlated mmto the test force, Fp

Length of spring during mmpresetting

Number of active turns —

Total number of turns —

Spring rate N/mm

Spring deflections, correlated mmto the spring forces, F1 to Fn

Solid spring deflection, correlated mmto thetheoretical spring force, Fc ~h,O

clear distance between adjoiningactive turns at the spring length, L,

Sp Spring deflection, correlated to mmtest force, Fp

D~.~ Coiling ratio —

L---------A

FIG.1 COMPRESSIONSPRINGWITHENDSCLOSEDAND GROUND WITHTHEORETICAL

CHARACTERISTICLINE

4 DESIGN

4.1 Material

The steel of different g~ades as given in IS 3195 andIS 3431 shall be used as the starting material forsprings. Any other material of special composition forspecial applications may be used in accordance withthe requirements of the user.

4.2 Direction of Coiling

Helical compression springs have a right-handed(clockwise) winding as a general rule. Springs forapplication in nested sets (assemblies) or where onespring is worlchg inside the other, the direction ofcoiling is alternatively left and right. The outer springsare generally with right-hand coiling. If the springs arerequired to have a left-hand (anticlockwise) coiling,the same must be mentioned in the order and enquiryor appropriately in data sheet as given in IS 7906(Part 3).

4.3 Spring Ends

For transmitting axial loads on the connecting body,the spring ends shall be so formed that for any positionof the spring, the spring action is axial as far aspossible. This is generally achieved by decreasing thepitch at the runout coil. The spring end is then groundso that a flat seating surface is obtained. Other typesof spring ends are shown in Fig. 2 to Fig. 5.

2

IS 7906 (Part 5) :2004

4.4 Total Number of Coils, nt

The total number of coils (@ varies depending on theend construction of the spring. For differentconstruction the number of coils is given below:

Types of Ends Total Number ofAccording to Coils, nt

Fig. 1 and Fig. 2 n+ 1.50Fig. 3 ??+ 1.00Fig. 4 n+ 1.50Fig. 5 n+ 1.67

4.5 Detailed design calculations for springs arecovered by IS 7906 (Part 1).

5 WIRE OR ROD DIAMETER BEFORECOILING

5.1 Roads with Rolled Surface (see Table 1)

Table 1 Nominal Diameter and PermissibleDeviations

S1No.(1)

O

ii)

iii)

iv)

v)

vi)

Nominal D]ameterd

(2)

8<d< 11.5

12<d <21.5

22 <d <29.5

30<d <39

40<d<50

52<d<60

Permissible DeviationsAd

(3)

*(3.15

5.2 Roads with Machined Surface, that is ~thTurned, Peeled or Ground Surface (see Table 2)

Table 2 Permissible Deviations of the NominalDiameter

N Nominal Diameter Permissible DeviationsNo. d Ad

(1) (2) (3)

i) 8<d<10 ? 0.05

ii) 10<d<20 ? 0.08

iii) 20<d<30 * c).KI

iv) 30<d<40 * 0.12

v) 40<d *IJ15

6 MANUFACTURING

6.1 Preparation of Bars

6.1.1 Springs for non-critical application can bemanufactured from as rolled bars.

6.1.2 Springs for critical applications, or wherespecific fatigue life is to be met, or where load-ratecharacteristics are important are generally made fromcentreless ground bars. In case the springs are to bemanufactured from centreless ground bars, the-samemust be. mentioned in the order and enquiry orappropriately in data sheet as given in IS 7906(Part 3).

6.1.2.1 If specified in the drawing/data sheet/purchase order, all ground bars should be subjectedto crack detection, by any one of the followingmethods:

@ .(f) @FIG.2 ENDS FIG.3 ENDSOPENCLOSEDAND AND UNGROUNDGROUND

-.

@

FIG.4 PIGTAIL FIG.5 ONE END

ENDS FORGEDANDGROUND AND ONE

END OPEN

3

IS 7906 (Part 5) :2004

a) Magnetic particle method as given as IS 3703;

b) ;ddy current method as given in IS 13190.

6.1.3 Before coiling, both ends of the bars should beproperly tapered (if specified in the spring drawing) togive the finished spring a firm bearing. The taperlength should be approximately equal to 0.75 of themean circumference of the spring. The taper portionshould be smoothly tapered with the tips rounded offand tip thickness at the edge should be approximately1/4 of the bar diameter.

6.2 Coiling and Heat Treatment

The bars for coiling should be uniformly heated in anindirectly heated furnace and soaked sufficiently. Theheated bars should be immediately coiled and pitched,taking care to ensure.that the red hot material remainsin contact with air for minimum possible time so as toavoid oxidation. The springs shall be uniformly heattreated for developing the required physical propertiesof materials and shall have the following finalhardness:

Material Hardness

Carbon steels 360 to 420 HB

Silica-manganese steels 380 to 460 HBChrome-alloy steels 400 to 460 HB

NOTES1 The hardness should be measured only on inactive coils.2 The hardness of the spring shall be measured on the outsidesurface after removal of the decarburized layer.

6.2.1 For springs made from unground bars, the limitfor decarburization may be fixed by agreementbetween the purchaser and the supplier.

6.2.2 Hardness checking shall be done in accordancewith IS 1500.

6.2.3 For springs made from centreless ground bars,the total depth of decarburization shall not exceed1 percent of the bar diameter.

6.3 Scragging

Each and every spring should be scragged 3 times inquick succession. The scragging height should be asindicated in the spring drawing/data sheet. In casethere is no such indication the springs should bescragged home. The scragging load in such casesshould not exceed 1.5 times the theoretical axial loadcorresponding to the block length.

6.4 End Grinding

Springs having ends as shown in Fig. 1 and Fig. 2.Springs should be ground to ensure square seating ofthe spring. The ends should not have any sharp edgesor burrs. Unless otherwise specified, the tip shall notprotrude beyond the outside diameter by more than 20

percent of the bar diameter.

6.5 Shot Peening

For increasing the fatigue life, the springs shall be shotpeened. After shot peening, the Almen arc height shallconform to those given in IS 7001 with a minimum archeight of 0.4 mm.

6.6 Surface Protection

The springs may be covered with suitable protectivecoating, immediately after shot peening to protectagainst corrosion. The protective coating to beapplied/anti-corrosive treatment to be given to thesprings, is subject to agreement between the purchaserand the manufacturer, and should be specified in thepurchase orderldrawingldata sheet.

6.7 Crack Detection

6.7.1 This is not applicable for springs made fromrolled bars.

6.7.2 If specified in the purchase order/datasheet/drawing, springs made from ground bars shouldbe subjected to magnetic crack detection, thepercentage of springs to be checked and theacceptance criteria should be mutually agreed tobetween the purchaser and the supplier. This crackdetection must be immediately carried out after shotpeening.

7 TOLERANCES

For reasons of economy in production, tolerancescould be prescribed only for those parameters whichare necessitated by the particular application. If closertolerances than those specified here are required, theseshall be agreed to between the manufacturer and thepurchaser.

7.1 Tolerances on Bar Diameter, Ad

7.1.1 Tolerance on bar diameter d, before coiling,‘both for rolled bars and ground bars shall be accordingin to IS 3195 or IS 3431 as applicable.

7.1.2 After coilinglheat treatment the tolerance onfinished bar diameter for springs made fromcentreless ground bars, shall be f 0.5 percent of thebar diameter or k 0.25 mm, whichever is higher.

7.2 Tolerance, AD on Coil Diameter D, De$ Di forUnloaded Springs

Tolerance shall be as given in Table 1. Only onediameter shall be indicated for tolerance in the orderor enquiry [see also IS 7906 (Part 3)] as follows:

a) De, when the spring is working in a guide, andb) D,, when the spring is working over a guide

(arbor).

The numerical values of the permissible deviations inTable 3 below apply solely to the end turn.

4

Because the active turns of the spring exhibit widertolerances than those specified in Table 1 for the endturns, it is recommended, in the case of springs whichoperate inside a sleeve or over a mandrel, to specify inaddition either the minimum diameter of the sleeveand the maximum diameter of the mandrel,respective y, on drawings and in enquiryldata sheetipurchase order.

7.3 Permissible Deviation of Ant, Total Number ofTurns

This requirement is applicable in cases where totalnumber of coils is not a means of manufacturingcompensation.

7.3.1 The following relationship is applicable tosprings made from as rolled bars:

A“t=k O.015nt

7.3.2 The following relationship is applicable tosprings made from centreless ground bars:

Ant= f 0.012 n!

7.4 Tolerances on Squareness and Parallelism forSprings with Ground Ends Made from as Rolled orGround Steel Bars

These shall be as given in Table 4.

IS 7906 (Part .5): 2004

7.5 Tolerance, A LOon Unloaded Length, Lo of theSpring

In the case of springs with stipulated axial loads andtheir associated spring height, the length L of theunloaded spring must in principle be regarded only asa guideline value. However, in cases where the length~ is tolerance, the following formulae apply to thepermissible deviation:

a) In-case of sprin s made from as rolled bars:

‘~=fOO1’l!Lo+sJ:+b) In case of spri~gs made from round bars:

? 9

1ALO=f O.012 (h+sc)~+l1

In the above cases, only the spring rate R may bespecified additionally.

7.6 Tolerance on Spring Rate, AR

The spring rate shall be tolerance only if it has adecisive influence on functional tiehaviour of thespring. In such cases, only one additional spring force,F, shall be tolerance in addition to the tolerance onthe spring rate, R.

The tolerance shaIl be as follows:

For spring made from as rolled bars

(1AR=+ O.065 :+1 XR

‘Table 3 Tolerances on Coil Diameter for Unloaded Springs(Clause 7.2)

S1 D, or Di AD. or ADi

“No. A Af 3 f \

Springs Made of Rods with a Rolled Springs Made of Rods with a Machined

Surface;for a Coiling Ratio, w Surface for a Coiling Ratio, w

fA \ ~

Over up to Up to 8 Over 8

(1) (2) (3) (4) (5) (6) (7)

i) 50 t0.8 *1.2 k0.6 ?0.8ii) 50 65 *1 *1.5 ?0.7 *1

iii) 65 80 * 1.2 k 1.8 k ().8 * 1.2

iv) 80 100 f 1.5 k 2.3 *1 ~ 1.5

v) 100 125 i 1.7 * 2.6 f 1.1 * 1.7

vi) 125 160 *2 *3 * L3 &2

vii) 160 2oi3 ? 2.2 ? 3.3 * 1.5 * 2.2

VIII 200 250 h 2.6 * 3.9 i 1.8 k 2.6

ix) 250 300 +3.1 k 4.6 +2.1 +3.1

x) 300 460 ~4 * 5.5 k 2.5 -14

Table 4 Tolerance on Squareness and Parallelism(Clause 7.4)

SI Feature Springs with Forged Springs with

No. or Rolled Flattened Ends Ground Ends

(1) (2) (3) (4)

i) Deviation in squareness, e, 0.03 LO(corresponds to 1.7°) 0.01Lo(0.57”)ii) Deviation in parallelism, e? 0.025 De (corresponds to 1.5°) 0.015 De (0.9”)

5

IS 7906 (Part 5) :2004

For spring made from ground bars:

[)AR= IO.045 ~+1 XR

7.7 Block Length, LC of Spring (Solid Length)

The length of the completely compressed springdependent on the type of its ends as given below:

Types of Ends According Block Length

to Figures

a) Fig. 1 and Fig. 2

1) Springs made ~ <(nt –0.3) dwfrom as rolledbars

2) Springs made LC< (n, ‘().4 )dh4.xfrom ground bars

b) Fig. 3 Lc< (n, + l)~Max

is

c) Fig. 4 &<(n[–1.15)dM.x

d) Fig. 5 &<l.OlntdM,~+t

The actual (existing) total number of turns, rounded toone decimal place after the decimal point must enterin the equation for m.

NOTE — The solid height of the spring may not be specified asa rule on the spring drawing. In case the solid height is speciallyrequired depending on the spring application only then it is tobe specified as a maximum value. In normal case the solid heightis not to be checked.

7.8 Permissible Deviatkmof the Spring Force

The relationship below applies to springs made of rodswith a rolled surface:

[ 0 (~+’)RlAF = tO.015 (L +Sp

The following relationship applies to springs made ofrods with a machined surface:

‘F=fOO’2[(L0+s’(:+l)RlIn special cases, the tolerance zone of the spring forcefor springs which operate together in pairs or groupscan be sub divided into test groups.

7.9 Minimum Space Between Individual WorkingCoils Under Maximum Permissible Test Load

The sum of the minimum spaces between theindividual working coils at L“ is given by:

S. >0.02 De . n

That is the clear distance between adjoining turns per

()

tut-n ~ shall be greater than or equal to 2 percent of

the external coil diameter, De.

Within S., the spring characteristics can be stronglyprogressive.

7.10 Workmanship

The surface of springs shall be free from injuriousdefects within normal limitations of hot coiled springs.

7.11 Bow

Bow shall be half the permitted tolerance of theout-of-squareness and the maximum shall occur in themiddle one-third of the spring.

7.12 Uniformity of Pitch

The pitch of the coils shall be sufficiently uniform sothat -when the spring is compressed to a heightrepresenting a deflection of 85 percent of nominal totaltravel, none of the coils shall be in contact with oneanother, excluding the inactive end coil. Under 85percent deflection the maximum spacing between anytwo adjacent active coils shall not exceed 40 percentof the nominal free coil spacing.

8 COMPLEMENTARY ADJUSTMENT FORMANUFACTURING

To enable springs to be held within limits of axialloads, the manufacturer requires complementaryadjustments during production. These shall bespecified by the following methods:

Prescribed Parameters

(1)

One axial load and the correspondingload length are specified

One axial load with correspondingload length and the spring rate

One axial load with correspondingload length and unloaded length

Two axial loads and correspondingload lengths

Length of the unloaded spring and thespring rate

Manufacturer’s

Discretion for(2)

L>

Lo, d,n

n and d orn and D.~,Di, D

LO,n,d or~, n and D,,Di D

d, n

9 SAMPLING

Sampling shall be done in accordance with IS 2500(Part 1) and IS 2500 (Part 2).

10 TEST

10.1 Static Load Testing

The percentage of springs to be subjected to this testmust be specified in purchase order/data sheet.

This testing is carried out on the spring in the normaldirection of loading with the spring standingvertically. In each case, before carrying out the statictest, the spring shall be compressed three times inquick succession to the block length or to a length

6

IS 7906 (Part 5) :2004

corresponding to the maximum permissible staticstress value, whichever is more. If then it is scraggedfurther, there shall be no further change in height. It isrecommended to gradually approach the prescribedload length and read off the corresponding axiaI load.An instrument error of ~1 percent in the loadindication shall be allowed.

10.1.1 Springs which are liable to buckle shall betested over or in a guide. The method of testing shallbe as agreed to between the purchaser and themanufacturer.

10.2 Characteristic Cume

The theoretical characteristic curve force deflectiondiagram (see Fig. 6) of a cylindrical helicalcompression spring, calculated according to IS 7906(Part 1), is a straight line. In practice, however, the startand finish of the spring characteristics show adeparture from linearity. If it is intended to check thespring rate by finding the characteristic of the spring,this shall be carried out over the range 0.3 to 0.7 F. soas to cover the linearity with certainty. Fn herecorresponds to the minimum permissible test lengthLn. The spring rate is given by:

% I L,

L S2 L2t

F.

t 0.7 F“ILuu F,~ 0.3 F.-.:

E 0 0.3$. 0.7s. S. s,%

% L.

L.

Lo

SPRING DEFLECTION S —

FIG.6 SPRINGCHARAmERISTICCURVE

~= F2– Fi Fz – F1 AF AF— = =—= —L1 – Lx S2 – S1 AL AS

where AF is the force increment due to the lengthreduction or to the deflection increment.

10.3 Test Load for Compressing to Block Length

When compressing to block length, & for testpurposes, the maximum spring force load to be appliedwould be 1.5 times the theoretical axial load springforce corresponding to block length, L..

10.4 Springs subjected to alternating loads shall .befatigue tested when manufactured from centrelessground bars subject to agreement between thepurchaser and the manufacturer.

10.5 Special tests, such as, tests for endurance, crampand temperature relaxation are subject to agreementbetween the purchaser and the manufacturer.

11 MARKING

11.1 The following markings shall appearappropriately on the spring:

a) Manufacturer’s name or trade-mark, andb) Year of manufacture.

These markings shall be stamped on springs madewithwire diameters of 15 mm and above and shall be soapplied that they are not detrimental to the life and thefunctioning of the springs.

11.2 BIS CertYlcation Marking

The product may also be marked with the StandardMark.

11.2.1 The use of Standard Mark is governed by theprovisions of the Bureau of Indian Standards Act,1986 and the Rules and Regulations made thereunder.The details of conditions under which the licence foruse of Standard Mark maybe granted to manufacturersor producers may be obtained from the Bureau ofIndian Standards.

7

1S 7906 (Part 5) :2004

ANNEX A

(Ffvewrmd )

COMMITTEE COMPOSITION

Automotive Springs and Suspension Sectional Committee, TED 21

OrganizationTata Motors Ltd, Jamshedpur

Akal Springs Pvt Ltd, LudhianaAll India Springs Manufacturers Association, MumbaiAshok Leyland Ltd, Chennai

Association of State Road Transport Undertakings, New Delhi

Central Institute of Road Transport, Pune

Central Mechanical Engineering Research Institute, Durgapur

Conventry Springs& Engineering Co Pvt Ltd, Kolkata

Controilerate of Quality Assurance (CQA) (OFV) Vehicle Factory,Jabalpur

Gabriel India Ltd, Mumbai

Jai Parabolic Springs Ltd,ChandigarhJamna Auto Industries Ltd, Yamuna Nagar

Kemen Springs Pvt Ltd, Mumbai”Mack Springs Pvt Ltd, ThaneMahindra & Mahindra Ltd, Nashik

Manrti Udyog Ltd, Gurgaon

Ministry of Heavy Industry& Public Enterprises, New Delhi

Research Designs & Standards Organization, Lucknow

Stumpp, Schuele & Somappa Pvt Ltd, Bangalore

The Automotive Research Association of India, PoneUpper India steel Mfg & Engg Co Ltd, LudlrianaVehicle Factory, Jabalpur

BIS Directorate General

Representative (s)SIiRI A. G. PRADHAN(Chtu”rman)

SHRI K.GOPALAKRISHNA (Alternate)GENERAL MANAGER

SHRIA. A. MIRCHANDANISHRIAPPALARAJU

SHRI U.JAIKRJSHNA(Alterna?e)SHRI A. S. LAKRA

SHRJP. M. PHATE (Alternate)SHRIN. R. KACHARE

SHRtP. S. MUNOLJ(Alternate)DR J. BASU

DRT. K. PAUL (Alternate)SHRIA. BAFNA

SHRIA. S. KOHLI (Alternate)GENERALMANAGER

SHRIK. SUNDARARAMAN

SHRI S. K. BHAUMICK(Alternate)SHRI SUNILHAROLIYASHRID. S. GILL

SHRIB. K. KHANDELWAL(Alternate)SHRIP. K. MtRCHANDAN1SHRI D. V. SHARMASHRIRAVINDRADESHMUKH

SHRIKAILASHIAT (Altemure)SHRtD. N.”DAvE

SHRIG. VIJAYAN(Alternate)SHRIS. K. BHARJJ

SHRIR. K. TRtPATHI(Alternate)JOINT DIJUXYDR(STANDARDS)

ASSISTANTDESIGNENGJNEER(Afternate)SHRIB. S. MDOKHERJEE

SHRIN. C. SRSNIVASAN(AUemate)SHRIS. RAIUSHRI R. P. ENGIRASHRIM. K. MISHRA

SHRIR. LODWAL (Alternate)

SHRJK.K. VASHKSHTHA,Director & Head (TED)[Representing Dkeetor General (Ex-ojicio)]

Member SecrelarySHRJP. K. SHARMA

Director (TED), BIS

8

Bureau of Indian Standards

91S is a statutory institution established under the Bureau of Indian .Standards Act, 1986 to p~omote

harmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BLS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course ofimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright 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 reviewed

periodically; a standard along with amendments is 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 edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No. TED 21 (339).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters :

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams : Manaksanstha

Telephones :23230131, 23233375,23239402 (Common to all offices)

Regional Offices : Telephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar ‘Marg

{

23237617NEW DELHI 110002 23233841

Eastern : 1/14 C.I.T. Scheme VII M, V. I. P. Road, Kankurgachi

{

23378499,23378561KOLKATA 700054 23378626,23379120

Northern : SCO 335-336, Sector 34-A, CHANDIGARH 160022

{

603843609285

Southern : C.I.T. Campus, IV Cross Road, CHENNAI 600113

{

22541216,2254144222542519,22542315

Western : Manakalaya, E9 MlDC, Marol, Andheri (East)

{

28329295,28327858MUMBAI 400093 28327891,28327892

Branches : AHMEDABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD,

GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR. LUCKNOW. NAGPUR.NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM. VISAKHAPATNAM.

Punted at Prabhat Offset Psess. New Delhi-2