IS 6735: Fasteners - Spring lock washers for screws with cylindrical heads

14 Pages·1994·1.4 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 6735 (1994): Fasteners - Spring lock washers for screws
with cylindrical heads [PGD 31: Bolts, Nuts and Fasteners
Accessories]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 6735 : 1994

Indian Standard
SRENETSAF - GNIRPS KCOL SREXISAW
ROF SWERCS HTIW LACIRDNILYC
HEADS - NOITACIFICEPS
(First Revision)
FirstR eprintF EBRUARY 1997
UDC621.882.449:621.882.215

8 BIS 1994
BUREAU OF INDIA N STANDARDS
MANAKBHAVAN, 9 BAHADUR SHAHZAFARMARG
NEW DELHI 110002
March 1994 Price Group 4
,stloB Nuts and srenetsaF seirosseccA lanoitceS ,eettimmoC ML 14
FOREWORD
sihT naidnI dradnatS ( tsriF noisiveR ) was detpoda yb eht uaeruB fo nardnI Standards retfa eht tfard
dezilanif yb eht ,stloB Nuts and srenetsaF seirosseccA lanoitceS eettimmoC had neeb devorppa yb eht
thgiL lacinahcel/h gnireenignE noisiviD .licnuoC
sihT standard was yllanigiro dehsilbup ni 1972. nI eht tneserp ,noisiver gniwollof rojam segnahc evah
neeb :edam a
)a eltiT and epocs evah neeb .deifidom
)b tnenamreP tes tset has neeb deifidom and dengila htiw NID 267 ( traP 26 ) : 1987.
)c tnenamreP daol tset has neeb detaroprocni ni enil htiw NID 267 ( traP 26 ) : 1987.
)d eerF thgieh fo spring kcol rehsaw has neeb .detaroprocni
)e derreferp-noN sezis evah neeb derevoc rednu etarepes .elbat
)f gnirpS ecrof tset has neeb detaroprocni ni eht xennA A rof .noitamrofni
leetS spring kcol washers evres ot tcaretnuoc eht ssol ni tnerehni noisnet desuac yb gnittes ro peerc of
a tun/tlob ylbmessa dedivorp that yeht era yltneiciffus tneiliser ot esaercni eht llarevo ecneiliser fo eht
ylbmessa and that rieht tnerehni springiness nac etasnepmoc rof yna ssol ni noisnet os that eht
gnipmalc ecrof deriuqer ot erusne eht ytilibailer fo eht ylbmessa is .deniatniam
erehT yam eb a evitaler tnemevom neewteb tlob and tun fi eht noitcirf neewteb eht depmalc -opmoc
stnen is emocrevo yb esrevsnart .secrof fI this seod ,rucco gninesool fo eht ylbmessa tonnac eb
detneverp yb spring kcol washers.
,suhT nehw using eseht ,stnenopmoc ti dluohs eb dekcehc rehtehw eht spring kcol washers yam yllufesu
eb deilppa as eht stnemele gniniatniam eht gnipmalc .ecrof
nI eht noitaraperp fo this noisiver assistance has neeb devired :morf
NID 7980 : 1987 gnirpS‘ kcol washers htiw erauqs sdne rof eseehc daeh ’swercs
NID 267 ( traP )62 : 1987 srenetsaF‘ - lacinhceT yreviled snoitidnoc - leetS spring washers rof
tun/tlob .’seilbmessa
IS 6735 : 1994
Indian Standard
FASTENERS-SPRINGLOCKWASHERS
FORSCREWSWITHCYLINDRICAL
HEADS-SPECIFICATION
(F irst Revision )
5
nevig ni eht tnaveler gnitalportcele standard ot
1 SCOPE
diova negordyh .tnemelttirbme
sihT standard srevoc stnemeriuqer rof spring
kcol washers elbatius rof esu htiw tun/tlob 7 NOITANGISED
seilbmessa gnivlovni srenetsaf fo ytreporp sessalc
ehT spring kcol washers shall eb detangised yb
less than 8.8 ni eht ezis egnar 2 ot 48 .mm
eht ,erutalcnemon lanimon ,ezis eht rebmun fo
2 SECNEREFER this standard and eht ecafrus ,noitcetorp fi .yna
ehT gniwollof naidnI Standards era yrassecen Examp Ie:
stcnujda ot this standard:
spring kcol rehsaw fo lanimon ezis 10 ,mm
A
and htiw etahpsohp gnitaoc shall eb -angised
ZS No. Title
det as :swollof
1501 dohteM rof srekciv hardness
gnirpS kcoL rehsaW 10 - SI 6735 etahpsohP
( traP 1 ) : 1984 tset rof cillatem :slairetam
traP 1 VH 5 ot VH 100 .detaoc
( dnoces revision ) 7.1 ehT noitangised rof HL spring kcol washers
4072 : 1975 leetS rof spring washers tsr;fr( shall eb deifidom as :swollof
revision ) gnirpS kcoL rehsaW HL - 10 SI 6735
etahpsohP .detaoc
6821 : 1973 sdohteM rof sampling -non
dedaerht srenetsaf 8 LARENEG STNEMERIUQER
3 SNOISNEMID 8.1 ehT talf secaf fo washers and eht renni and
retuo seirehpirep shall eb htooms and eerf morf
ehT snoisnemid fo eht spring kcol washers shall ,gnilrunk ,snoitarres ,skram-eid peed sehct~arcs

eb as nevig ni selbaT AI and .B1 ,cte hguohtla slight deef llor marks shall eb
.elbissimrep
4 LAIRETAM
8.2 Washers shall osla eb eerf morf ,srrub rust,
ehT spring kcol washers shall eb edam morf
tip marks, esool elacs and stcefed that thgim
elbatius leets gnidrocca ot SI 4072 : 1975 ot teem
tceffa rieht .ytilibaecivres
eht stnemeriuqer .deificeps
8.3 ehT secnaraelc and selgna fo eht tuc sdne
5 TAEH TNEMTAERT
shall eb ni hcus eerged os that eht washers od
ehT spring kcol washers retfa gnilioc shall eb ton esuac lapping nehw yeht era yletelpmoc
ylbatius taeh detaert ot a hardness fo VH 430 desserpmoc and shall ton eb elbail ot elgnat ro
ot 530. knil rehtegot nehw ni eht eerf .noitidnoc
9 GNILPMAS AND ECNATPECCA
6 HSINIF
ehT sampling and ecnatpecca airetirc shall eb
gnirpS kcol washers shall eb deilppus ni larutan
ni ecnadrocca htiw SI 6821 : 1973.
hsinif unless esiwrehto deificeps yb eht -ahcrup
.res At eht tseuqer fo eht ,resahcrup washers
STSET
yam eb etahpsohp ,detaoc lekcin ,detalp ,dennit 10
,dezinavlagortcele reppoc detalp ro muimdac 10.1
Hardness Test
.detalp ehT lanoitcnuf seitreporp fo eht spring
kcol washers shall ton eb deriapmi as a tluser fo ehT hardness shall eb detset ni ecnadrocca htiw
eht evitcetorp .sgnitaoc esehT detaoc washers SI 1501 ( traP 1 ) : 1984. roF gnitlcehc hardness,
shall eb detcejbus ot etairporppa tnemtaert as eht washers shall eb ylthgil dnuorg ot assure eht

1
IS 6735 : 1994
lavomer fo a dezirubraced ro detalp .ecafrus ehT eerf thgieh fo eht washers retfa esaeler fo
ehT seulav shall eb ,derusaem erehw ,elbissop ni daol shall ton eb less than eht seulav deificeps ni
eht elddim fo eht rehsaw ecafrus at eht tniop fo selbaT 2A and .B2
tcatnoc htiw eht gnitroppus .ecafrus
10.3 tnenamreP daoL tseT
10.2 tnenamreP teS tseT
neT spring kcol washers, dedaerht no a tlob and
ehT spring kcol rehsaw shall eb desserpmoc detarapes morf eno rehtona yb decaf-lellarap
neewteb ,denedrah talf dnuorg washers ( htiw a washers ( denedrah ot muminim 500 VH ,) shall
hardness fo ton less than 60 CRH ) rof owt ton kcarc ro erutcarf retfa 48 sruoh -noitidnoc
setunim using eht noisserpmoc sdaol deificeps ni gni at tneibma erutarepmet rednu eht -serpmoc
selbaT 2A and .B2 nois sdaol deificeps ni selbaT 2A and .B2
elbaT
1A Dimensions for Spring Lock Washers for Screws with Cylindrical-Heads
( Clause 3 )
All dimensions in millimetres.
-
Nominal ad ! s Mass ( 7’85 1F or Thread
Size Max 1 Basic Limit k&m3 1 I Size
Min Max 1Deviations I Mir I
-I -
_-
T-
3l’ 3’1 3’4 5’6 1 kO.1 2 2’36 0’2 0’105 3
4 4’1 4’4 7 1’2 kO.1 2’4 2’53 0’2 0’195 4
5 5’1 5’4 8’8 1’6 LO.1 3’2 3’78 0’2 0’37 5
6 6’1 6’5 9’9 J . 6 +_O’l 3’2 3’78 0’3 0’425 6
8 8’1 8’5 12’7 2 LO.1 4 4’72 0’5 1’05 8
10 10’2 10’7 16 2’5 kO.1 5 5’9 0’8 1’96 10
12 12’2 12’7 18 2’5 kO.15 5 5’9 0’8 2’28 12
16 16’2 17 24’4 3’5 &0’2 7 8’25 1 5’94 16
20 20’2 21’2 30’6 4’5 +_0’2 9 10’6 1 12’3 20
24 24’5 25’5 35’9 5 io.2 10 11’8 1’6 18’1 24
30 30’5 31’7 44’1 6 f0’2 12 14’2 1’6 32 30
36 36’5 37’7 52.2 7 +0’25 14 16’5 1’6 52’5 36
42 1) 2 ~42’5 43’7 60’2 8 +_0’25 16 18’9 2 80 42
481’ 1) 49 50’5 67 8 50’25 16 18’9 2 90 48
1 ___
1) Test values for the spring force test as described in Annex A have not as yet been specified for these nominal
sizes.
*) Test values for the test for permanent set as described in Annex A have not as yet been specified for these
nominal sizes.

2
SI :5376 4991
Table 1B Dimensions for Spring Lock Wasbers for Screws with Cylindrical
Heads of Non-preferred Sizes
( Clause 3 )
llA snoisnemid ni .sretemillim
- - -
Nominal zd s h r Mass ( 7’85 For Thread
Size xaM kg/dm3 1 Size
niM cisaB timiL Min Max per 1000
noitaiveD units in kg
3
_____^
3’S’ 3’6 3’9 6’1 1 l’OtZ 2 2’36 0‘2 0‘114 3’5
14 14’2 14’7 21’1 3 kO.2 6 7’1 1 3’8 14
18 18’2 19 26’4 3’5 5 0’2 7 8’25 1 6’6 18
22 22’5 23’5 32’9 4’5 kO.2 9 10’6 1 13’6 22
27 27’5 28’5 38’9 5 kO.2 10 / 11’8 1.6 20’6 27
33 33’5 34’1 47’1 6 f0’2 12 I 14’2 1’6 35 33
- -
I) tseT seulav rof eht gnirps ecrof tset sa debircsed ni xennA A evah ton sa tey neeb deificeps rof siht lanimon
.ezis
-

Table 2A Compression Load a nd Free Height Table 2B Compression Load and Free Height

of Washers After Compression of Washers of Non-preferred Sizes
( Clause 10.2 and 10.3 ) After Compression
( Clause 10.2 and 10.3 )
Nominal COMpreSSiOn Min$nzg;tFree
Size Load
mm N mm Nominal Compression Minimum Free
Size Load Height
3 1 760 1’6
mm N mm
4 3 050 1’9
5 5 050 2’5 3’5 2 370 2’6
6 7 050 2’6
Y 12 900 3’2 14 41 300 4’8
10 20 600 4
18 69 000 5.8
12 30 000 4
16 56 300 5’6 22 110 000 7’2
i”
20 88 000
24 127 000 21 167 000 8
30 204 000 9’6 33 255 000 9‘6
36 298 000

3
SI 5376 : 1994
.-I-
WRENCH JAW
bI
+-
-VICE JAW
.GIF 1 TSIWT a
TEST
10.4 tsiwT tseT )a noitacidnI fo ecruos fo ,erutcafunam
A noitrop fo eht rehsaw shall eb deppirg ni eciv )b lanimoN ,ezis and
jaws and neht lauqe noitrop shall eb deppirg ni
hcnerw jaws as nwohs ni .giF 1. segdE fo eht )c .ytitnauQ
hcnerw jaws shall eb sharp and lellarap ot eht
eciv jaws. ehT hcnerw shall neht eb detator ni 12.2 SIB noitacifitreC Marking
a noitcerid that sesaercni eht eerf thgieh fo eht
spring rehsaw llit eht rehsaw is detsiwt hguorht ehT tcudorp yam osla eb dekram htiw dradnatS
an elgna fo 90”. ehT rehsaw shall wohs on sign Mark.
fo .erutcarf
11 GNIKCAP 12.2.1 ehT esu fo eht dradnatS Mark is denrevog
yb eht snoisivorp fo uaeruB fo naidnI Standards
Unless esiwrehto ,deificeps spring kcol washers
,tcA 1986 and eht seluR and snoitalugeR edam
shall eb dekcap ni snotrac fo 100, 500 ro 1 000.
.rednuereht ehT sliated fo snoitidnoc rednu
hcaE notrac shall niatnoc spring kcol washers
hcihw eht ecnecil rof eht esu fo~ dradnatS Mark
fo eno ezis .ylno
yam eb detnarg ot srerutcafunam ro srecudorp
12 GNIKRAM yam eb deniatbo morf eht uaeruB fo naidnI
12.1 hcaE notrac gniniatnoc eht spring kcol Standards.
washers shall eb dekram htiw eht :gniwollof
ANNEX A
( Foreword, Tables 1A and 1 B )

l-A GNIRPS FORCE TSET ehT yrotanalpxE setoN ebircsed a elbatius tset
ecived and edulcni selpmaxe fo spring
A spring ecrof tset yam eb deirrac tuo ni redro .scitsiretcarahc
ot assess eht springiness fo spring washers, this
tset gnittimrep eht laudiser spring ecrof ot eb ehT laudiser spring ecrof seulav tneserper
.denimreted lanoisivorp ,snoitacificeps htiw hcihw -irepxe
ecne has ot eb .deniag elbaT 3 sezirammus eht
ecalP eht rehsaw ot eb detset ni a tset ecived laudiser spring secrof .deriuqer
and ylppa eht noisserpmoc daol deificeps ni
selbaT 4A and ,B4 eht tset ecived gnieb 2-A YROTANALPXE SETON OT GNIRPS
dengised ot timrep as mrofinu an noitacilppa fo FORCE TSET
eht daol as .elbissop ehT erusserp netalp shall
ehT laudiser spring secrof deificeps era desab no
evah a ecafrus hardness fo at tsael 60 IIRC.
stset and eht tnaveler lacinhcet ,erutaretil tub
retfA owt ,setunim eht daol deilppa ot eht
spring rehsaw shall eb ylwols and ylidaets era ton as yet yltneiciffus substantiated rof meht
ot eb edam yrotadnam rof ecnatpecca -cepsni
desaeler hguorht a levart fo 20 ,mp hcihw shall
noit at .tneserp erofeB yrotadnam data nac eb
eb derusaem using a noisicerp gnirusaem ecived
,deificeps rehtruf ecneirepxe- and tset stluser era
( ees 2-A .)
dedeen ot niatbo a yllacitsitats substantiated
.noitaulave
ehT laudiser spring ecrof shall hcaer eht seulav
deificeps ni selbaT 4A and ,B4 eud ecnawolla ehT emas noisserpmoc sdaol desu rof eht
gnieb edam rof yna noitamrofed fo eht tset tnenamrep tes and tnenamrep daol stset ylppa
.ecived as rof eht spring ecrof ,.tset

4
IS 6735 : 1994
Table 3 Residual Spring Force
( Clause A-l )
Type of Washer Compression Load Correspood- Residual Spring Force After Release Through
ing to the Proof Load for Travel of 20 pm as a Percentage of the
Property Class Compression Load
for lanimon sezis 4 ol 5
6.V) 20%
30% for lanimon sezis 6 ot 12
40% for lanimon sezis 14 ot 20
50% for lanimon sezis evoba 20
‘) gnirpS kcol washers hcihw era ylno dednetni rof tun/tlob seilbmessa gnivlovni srenetsaf fo a ytreporp ssalc
ssel naht 6’8 era osla ot eb detset at noisserpmoc sdaol gnidnopserroc ot ytreporp ssalc 6.8 foorp .sdaol
Table 4A Compression Load and Minimum mvl dna a hardness fo !ton less than 700 .VH
ehT washer snoisnemid ( edisni ,retemaid -tuo
R.esidual Spring Force
( Clauses l-A and A-2 ) edis retemaid dna ssenkciht ) llahs eb lacitnedi
ot those of the gnips washer ot eb tested. tolP
the feiler citsiretcarahc of the test ecived
Nominal Compression Minimum Residual
Size Load I) Spring ecroF gnitrats at the snoisserpmoc sdaol deificeps ni
N N selbaT 4A and .B4 tI is laitnesse that lellarap
decaf washers gnivah eht emas snoisnemid as
4 3 050 600
eht spring kcol washers ot eb detset eb desu
5 5 050 1 000
nehw gnidrocer eht feiler citsiretcarahc fo eht
6 I 050 2 100
tset ,ecived as dezis-tnereffid washers lliw evig
8 12 900 3 900 tnereffid .scitsiretcarahc
10 20 600 6 200
As an ,elpmaxe ni .giF 3, eht suounitnoc enil
12 30 000 9 000
stneserper eht latot feiler citsiretcarahc fo
16 56 300 22 500
spring kcol rehsaw plus tset ecived rof a
20 88 000 35 200
SI leetS-21A-3603 spring kcol rehsaw
24 127 000 63 000 derusaem rednu a noisserpmoc daol fo 30 kN,
30 204 000 102 000 and eht dehsad ,enil eht feiler citsiretcarahc fo
36 298 000 149 000 ecived .ylno A tnemges fo eht feiler -siretcarahc
I) gnidnopserroC ot ytreporp ssalc 6.8. cit fo eht spring kcol rehsaw deniatbo yb
noitcartbus fo eht owt sevruc is dettolp as a
Table 4B Compressiou Load asd Minimum niahc .enil
Residual Spring Force of Washers of oT diova yna ytilibisrever rorre fo eht ecrof
Non-preferred Sizes gnirusaem ecived and eht levart ,eguag eht
( Clauses l-A and 2-A ) seulav fo noisserpmoc daol deificeps ni
selbaT 2A and B2 yam eb dedeecxe yb %5 nehw
gniylppa eht .daol ehT starting tniop rof -usaem
Nominal co~pD~ds;io Minimum Residual
Size Spring Force gnir eht 20 mp levart shall ,revewoh eb eht
N N noisserpmoc daol deificeps ( ees .giF 4 .)
14 41 300 16 500
hguohtlA eht 20 mp levart is ni tsom sesac
18 69 000 27 600
regral than eht elbaborp tnuoma fo gnittes fo a
22 110 000 55 000
tun/tlob ylbmessa eud ot ecafrus ssenhguor and
27 167 000 83 000 ,sgnrtaoc this levart nac eb decudorper ni eht
33 255 000 127000 tset htiw ylevitaler retaerg ycarucca than a 5 mp
1j gnidnopserroC ot ytreporp ssalc 6.8. ro 10 mp .levar$
,suhT eht laudiser spring secrof nevig ni
When determining the spring characteristic of selbaT 4A and B4 tneserper rewol timil seulav
spring lock washers as part of the spring force rof eht gnipmalc secrof fo tun/tlob seilbmessa
test, the effect of the elastic deformation of the gnitibihxe an yllanoitpecxe hgih eerged fo
test device is to be allowed for by deducting the gnittes at gnitrap .senil ehT eerf thgieh fo
spring travel originating in the test device from spring kcol washers retfa lavomer fo eht foorp
the overall travel ( i.e. that of spring washer ,daol hcihw was ylsuoiverp eht elos spring
and test device ). The relief characteristic for citsiretcarahc ,deitceps sevig ylno elttil -acidni
ihe test ecived is ot eb denimreted as .swollof noit fo eht ytiliba fo a spring kcol rehsaw ot
ecalP a plain rehsaw daetsni fo a spring rehsaw tcaretnuoc eht gninesool fo a tun/tlob ,ylbmessa
ni eht tset ecived ( ees .giF 2 rof elpmaxe ,) eht as eht tsetaerg feiler slevart era ni eht yrev talf
plain rehsaw gnieb deppalr no htob sides and tnemges fo eht citsiretcarahc erehw eht secrof
gnivah a ecnarelot no msilellarap ton gnideecxe era yrev small. ehT evruc dettolp ni .giF 3,
5