IS 2687: Cap nuts

11 Pages·1991·1.1 MB·English

by  Bureau of Indian Standards

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timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 2687 (1991): Cap nuts [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 2667: 1891

Indian Standard
CAPNUTS-SPECIFICATION
( Second Revision
UDC 621.882~38

@ BIS 1991
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 ,BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
December 1991 Price Group 2
Bolts, Nuts and Fasteners Accessories Sectional Committee, LMD 14
FOREWORD
This Indian Standard ( Second Revision ) was adopted by the Bureau of Indian Standards, after the
draft finalized by the Bolts, Nuts and Fasteners Accessories Sectional Comrnittee had been approved by the
Light Mechanical Engineering Division Council.
This standard was originally published in 1964 and revised in 1975. The present revision has been
necessitated consequent upon the revision of IS 1367 : 1967 ‘Technical supply conditions for threaded
steel fasteners’ to incorporate the changes agreed at International Level.
In this revision, the following changes have been made:
4
Contents of standard have been revised and aligned with the latest version of basic standards
related to fasteners.
)b
Precision grade P has been redesignated as Product Grade A as per IS 1367 ( Part 2 ) : 1979.
lc Minimum wrenching height m has been included.
4
Nut bearing faces have been specified more precisely by introducing dimension d, and d,.
4 All the non-preferred sizes have been deleted.
f 1 The width across flat dimension has been changed for thread size MIO, Ml2 from 17 and 19 to
16 and 18 mm respectively. The dimensions relating to old width across flats are given below:
.NomipxxeT hread Old Width Across Flat(s) dw e
c------~-_--~
i
Max=.Nom Min Min Min
10 17 16.73 15.3 18.9
12 19 18.67 17.2 21.1
Ed Technical supply conditions have been brought out in a table form.
h) Provision of threaded hole for sizes > M24 has been deleted.
>j Thread sizes have been a dded.

The standard has been fully revised by changing the contents and presentation.
The Cap Nuts of thread sizes Ml0 and Ml2 with old width across flats dimension shall be phased out of
production and use gradually.
In the preparation of this standard, assistance has been derived from DIN 917-1987 ‘Hexagon Cap Nuts’
issued by Din, Deutsches Institut fi.ir Normung.
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
with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )‘. The number of significant places
retained in the rounded off value should be the same as that of the specified value in this standard,
IS 2687 : 1991
Indian Standard
CAP NUTS - SPECIFICATION
( Second Revision )
1 SCOPE IS ivJ Title
This lndian Standard covers the requirements for ( Part I1 ) Electroplated coatings on
cap nuts of product Grade A in the size range threaded fasteners ( under
M4 to M48 with coarse pitch and fine pitch preparation )
threads. ( Part I3 ) : 1983 Hot dip galvanised coatings
on threaded fasteners ( second
2 REFERENCES
revision j
2.1 The following Indian Standards are necessary ( Part I4 ) : 1984 Stainless steel threaded faste-
adjuncts to this standard: ners ( second revision )
SI .oN Title ( Part 18 ) : 1979 Marking and mode of delivery
( second revision )
1367 Technical supply conditions
1369 : 1982 Dimensions for screw thread
for threaded steel fasteners:
runouts and undercuts ( second
( Part 1 ) : 1980 Introduction and general revision )
information ( second revision ) 2614 : 1969 Methods of sampling of faste-
( Part 2 ) : 1979 Product grades and tolerances ners (first revision )
( second revision ) 4218 IS0 Metric screw threads -
( Part 5 ) 5 1979 Tolerances (Jirst revision )
( Part 6 ) : 1980 Mechanical properties and test
methods for nuts with specified ( Part 6 ) : 1978 IS0 Metric screw threads -
proof loads ( second revision ) Limits of sizes for commercial
bolts and nuts ( diameter
( Part 10 ) : 1979 Surface discontinuities on nuts range 1 to 52 mm ) (jkt
( second revision ) revision )
3 TECHNICAL SUPPLY CONDITIONS
Dimensions Table 1
Tolerances Product Grade A
Indian Standard IS 1367 ( Part 2 ) : 1979

Screw Threads Tolerance 6H
Indian Standards IS 4218 ( Part 5 ) : 1979
IS 4218 ( Part 6 ) : 1978
Material Steel Stainless Non-ferrous
Steel Metal
Mechanical Property )I <M36 : 5 <36 : AI-50 Brass or
Properties Class gM36 : sa agreed >M36 : as agreed Al. Alloy
by purchaser by purchaser
& supplier & supplier
Indian IS 1367 IS 1367 Min
Standards ( Part 6 ) : 1980 ( Part 14 ) : 1984 300N/mms
As produced or Bright As produced
electroplated
Finish Electroplated
coatings: IS 1367
( Part I I )
Hot-dip galvanized
coatings : IS 1367
( Part 13 ) : 1983
UAny other property class or material as per the agreement between purchaser and supplier.
1

I
Table 1 Dimensions for Cap Nuts
( Clause 3 )
7
e
1

_) OTHER DIMENSIONS AS
FOR LEFT HAND FIG.
m’s t$Jpt4M WRENCHING
FOR SIZES UP TO Ml0 FOR SIZES Ml2 8, ABOVE
llA snoisnemid ni .sertemillim
-- -- .___- - --- --- -
,
Coarse Pitt’ h I I
Series 1 4M SM _ - -_ 6Ul___ 8M Ml0 MI2 6lM I 02fh __ 42M 03M ____- 63M 24M M48
Series 2 - - - 8M x 1 0lM x 1 21M x 5’1 6lM x 5’1 02M x 2 42M x 2 03M x 2 63M x 3 24M x 3 84M x 3
- ___- - _
d
seireS 3 - - - - 0lM x 52’1 21M x 52’1 02M x 5.1 - - - -
- - _- _- -___ _ -
Pl) 7’0 80 1 52’1 5’1 57’1 2 5’2 3 5’3 4 5’4 5 -
- _ - -- ___~_
Min 4 5 6 8 01 21 61 02 42 03 63 24 84
- __ y- -
da
Max 6’4 57’5 57’6 57.8 8.01 31 3’71 6.12 9’52 4.23 9.83 4’54 8’15
-- -- -
bw niM 8’5 8.6 8.8 3’11 3’41 2’61 2’22 2.82 2’33 7’24 1’15 6’06 4.96
-. _- p- ._
d niM 66’7 97’8 50.lI 83’41 77.71 30’02 57.62 59’23 - 55’93 58’05 97’06 20’27 06’28
-. _- .
seireS 1 I 50’1 2’1 5’1 78’1 52’2 - I - - - -
44 seireS : , - - - 5.1 5.1 - -
xaM seireS z I - - 78’1 - - - - - -
- -- _ - -__
seireS I - - - - 4’6 3.7 3.9 7.01 41 61 5*81
f23) seireS 2 , - - - - _- 6’5 6.5 3.7 3.7 7’01 7.01 7.01
seireS 3 , - - - - - 9’4 - 6.5 - - - -
- - -- _- ~_
Max = moN 5.5 7 9 21 41 61 02 52 03 44 25 85
r‘ ._ _ - . -- l --.___ _-
niM 2.5 46.6 46.8 75’11 75’31 75’51 84.91 42 84 84’92 83.33 83’34 62.15 62.75
-- -. - .- ~- -
’n Min _ 57’2 5’3 5.4 . - 6 7 8 ---___ 01 5.21 51 -- 71 22 . - 62 92

8 OI 1 2 51 02 52 03 53 04 06 07 08 09
-- .- . -~
Max = moN 7 8 1 0 31 61 81 42 03 63 64 55 56 57
~.-
Min 87.6 87’7 87.9 37.21 37’51 37’71 76’32 61.92 53 54 8’35 8.36 1.37
-- -
Min -__ 61’4 69’4 17.6 -- 12’9 - 56’01 51’31 56’61 8502 85.32 85’72 5.53 _ 5’14 5.74
Max 46.4 44’5 92.7 97’9 ; 53’11 58.31 53.71 24’12 24’42 24.82 5’63 5’24 5.84
.- -__ -_ -- ____-
7 Min 1 1 5.1 2 2 2 I 5’2 3 3 4 4 4
- -
)1 P = Coarse hctip sa rep IS 8124 rof seireS .1
)2 roF sezis < 0lM daerht tucrednu ro daerht tuonur 2e Max = .P5’1
13 roF sezis > MI0 daerht tucrednu sf Max ( trohs ) sa rep IS 9631 : .2891
IS 2687 : 1991
4 DESIGNATION 5 GENERAL REQUIREMENTS
4.1 The Cap Nuts shall be designa ted by the 5.1 With respect to surface discontinuities, the
nomenclature, thread size and number of this cap nuts shall conform to IS 1367 (Part 10) : 1979.
standard.
5.2 In respect of requirement not covered in this
4.1.1 A Cap Nut of thread size M8 shall be standard, the nuts shall conform to IS 1367
designated as: ( Part 1 ) : 1980.
Cap Nut IS 2687 - M8 6 SAMPLING
4.2 When Stainless Steel, Brass or Aluminium 6.1 Sampling and criteria for acceptance shall be
Alloy is used for manufacture bf cap nuts, the in accordance with IS 2614 : 1969.
word ‘Stainless Steel’, ‘Brass’ and ‘Aluminium’
shall be added at the end of the designation. 7 MARKING AND MODE OF DELIVERY
4.2.1 A Cap Nut of thread size Ml0 and made 7.1 The marking of the cap nuts and mode of
of Brass shall be designated as: delivery shall be in accordance with IS 1367
Cap Nut IS 2687 - Ml0 - Brass ( Part 18 ) : 1979.
Standard Mark
ehT esu fo eht dradnatS Mark is denrevog yb eht snoisivorp fo eht Bureau of Indian
Standards Act, 1986 and eht seluR and snoitalugeR edam .rednuereht ehT dradnatS Mark no
stcudorp derevoc yb an naidnI dradnatS syevnoc eht ecnarussa that yeht evah neeb
decudorp ot ylpmoc htiw eht stnemeriuqer fo that standard rednu a llew denifed metsys fo
,noitcepsni gnitsot and ytilauq lortnoc hcihw is desived and desivrepus yb SIB and detarepo
yb eht .recudorp dradnatS dekram stcudorp era osla ylsuounitnoc dekcehc yb SIB rof -noc
ytimrof ot that standard as a rehtruf .draugefas sliateD fo snoitidnoc rednu hcihw a ecnecil
rof eht esu tfo eh dradnatS Mark yam eb detnarg ot srerutcafunam ro srecudorp yam eb
deniatbo morf eht uaeruB fo naidnI Standards.
I I