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“The Right to Information, The Right to Live” “Step Out From the Old to the New”

IS 5369 (1975): General Requirements for Plain Washers and

Lock Washers [PGD 31: Bolts, Nuts and Fasteners
Accessories]

“!ान $ एक न' भारत का +नम-ण”

Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”

है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
UDC 621.882’4 ( Fifth Reprint FEBRUARY 1996 ) IS : 5369 - 1975

( Reaffirmed 2001 )
Indian Standard

GENERAL REQUIREMENTS FOR

PLAIN WASHERS AND LOCK WASHERS

(First Revision)

1. Scope- Covers the general requirements and permissible deviations for plain washers, lock
washers and similar parts.

2. Grades -Two grades of washers are specified, namely, Precision and Ordinary.

3. Dimensional Accuracy

3.1 The permissible deviations on the main dimensions and concentricity of the hole with respect
to the outside diameter of the precision grade washers shall be as specified in Tables 1 and 2.

3.2 The permissible deviations on the main dimsnsions and concentricity of the hole with respect to
the outside diameter of the ordinary grade washers shall be as specified in Tables 3 and 4.

1 TABLE 1 PERMISSIBLE DEVIATIONS FOR PRECISION WASHERS

( Clause 3.1 )

All dimensions in millimetres.

j?j$j @!Y$$.i, *@ $jjj$q

I
/ I
1 I Reference Permissible Deviation (Tolerance Zone ) 1 Permlssible j
Dimension Deviation
/ ,,z Lock )Nidth on Concen-
Over up to bl dl* tricity xt
j :
I
3 H13 ! h14 h13 2 IT12
hi4 H13 h14 h13 2 IT12
I
: 1: h14 H13 h14 h13 2 IT12
j _-_ ~. ~~ _
/
10 h14 H14 h14 h13 2 IT12
! :: h14 H14 h14 h13 2 IT12
lo” 50 h14 H14 h14 j h13 2 IT12
I____

/ ’ 80 -1 - H14 h15 2 IT13

8”: 1 120 - H14 h15
120 ! 180 - H14 h15 / : ) %“,
-___ ! ~___---

180 j 250 j - - h15 2 IT13

1 - j

*In case of punched holes the tolerance zones H13 and H14 for the hole diameter do not apply to the
punch exit side of the washers.
tFor calculating the magnitude of the concentricity tolerance, the reference dimension shall be d$.

_ .-. -- -. -__

Acicpted 29 September 1975 @ January 1976, BIS Gr 2

I I

BUREAU OF INDIAN STANDARDS

h!ANAK BHAVAN, 9 BAHADUA SHAH ZAFAR MARG
NEW DELHI 110002
IS : 5369 - 1975

TABLE 2 PERMISSIBLE DEVIATIONS FOR THICKNESS, PARALLELISM AND

FLATNESS FOR PRECISION WASHERS
( Clause 3.1 )
All dimensions in millimetres.

Washer Thickness Permissible ; Permissible Devia-

s-- Deviation for tion in Parallelism Flatness
Thickness ! of Bearing Faces Tolerance
c
Over S t

f
up to
l - --.~
I /-- I
- 0’1 0.05 I
i-5
I 1
I-------I----
l-5
4
f
f

f
(F2
0’3

0’6
8115

0.2
j
I
i:;
0.3

0.4
/
I

0’3 0.6
10 0’4 1

TABLE 3 PERMISSIBLE DEVIATIONS FOR ORDINARY WASHERS

( Clause 3.2 )
All dimensions in millimetres.

PERMISSIBLE ANGLE VARIATIONS FOR SQUARE HOLE PERMISSIBLE VARIATION

AND EXTERNAL SQUARE ?2’ ON TAPER tf

II Reference
Dimension
! Permissible Deviation
--
(Tolerance Zone )
!
Permissible
Deviation
I ______ on Concen-
b2 dl* d? tricity xt
I Over up to al
~_ ____._
6 H15 - - H14 2 IT16
: H15 - - H14 h16 2 IT16
:i H15 rtl - H14 h16 2 IT16
lo !
I
!
18 H15 A2 jsl6 H14 h16 2 IT16
I - f 2.5
:: js16 H15 h16 2 IT16
E 80 - *3 js16 H15 h16 2 IT17
I
,
I *4 - H15 h16 / 2 IT17
1:: f5 - H15 h16 1
I / ii! 5 2 IT17
180 - - - h16 j 2 IT17
I , - ---
*In case of punched holes the tolerance zones H14 and H15 for the hole diameter do not apply to the ounch exit side
of the washers.
tFor calculating the magnitude Of the concentricity tolerance, the reference dimension shall be d?. _

2
 IS : 5369.1975

TABLE 4 PERMISSIBLE DEVIATIONS FOR THICKNESS, PARALLELlSM AND

CONVEXITY FOR ORDINARY WASHERS

( C/a/se 3.2 )

All dimensions in millimetres.

I
! Warper Thickness i Permissible Permissible Devla-
Flatness
8 Deviation for tion in Parallelism
Tolerance
Thickness of Bearing Faces
s t e
Over up to

/----
I
I 4 6 *1 0.5 0.6
f 1’2 0.6
/ 1: :8 f 1.5 1.0 ;:;
4

4. Material - The material of plain washers and lock washers shall be according to the respective
product standard.

5. Finish - The plain washers and lock washers shall be supplied in natural finish unless otherwise
specified by the purchaser. At the request of the purchaser, washers may be phosphate-coated,
nickel-plated, tinned, galvanized, copper-plated or cadmium-coated. In such cases, the dimensions of
the washers shall apply before coating. The properties of the washer shall not, however, be impaired
by the protective coating specified by the purchaser.

6. Other Requirements

6.1 The washers shall be free from cracks, burrs, pits and other defects. All sharp edges shall be
removed. In particular, precision grade washers shall not have any tool marks.

6.2 The supply requirements in the case of metallic washers shall conform to IS: 1387-1967 ‘General
requirements for the supply of metallurgical materials (first revision) ‘.

7. Sampling and Acceptance -The sampling procedure for the testing and inspection of washers
shall be in accordance with IS : 6821-1973 ‘ Methods for sampling non-threaded fasteners’.

8. Testing of Material and Coating- The material constituting the washers and lock washers
has to be tested only if special requirements are specified for the material; similarly- it applies to
testing of coating.

9. Packing - Unless otherwise specified the precision grade washers shall be packed in cartons of
100, 500 and 1 CC0 or multiples thereof. The ordinary grade washers shall be packed in cartons of
2’5 kg, 5 kg or bags of 50 kg. Each carton or bag shall contain washers of one size only.

IO. Marking - The label on the carton or bag shall carry the size, number of pieces and the
manufacturer’s mark or trade-mark.

IO.1 Certification Marking - Details available with the Bureau of Indian Standards.

3
IS : 5369.1975

EXPLANATORY NOTE

This standard was first published in 1969. In the present revision the changes and additions
made are enumerated below:

a) ‘Bright ’ and ‘ Black ’ washers have been re-designated as ‘ Precision ’ and ‘Ordinary ’ washers
respectively. The new designations correspond more closely to the practical situation.

b) The old terms ‘ bright’ and ’ black’ no longer have any justification, since depending on
the manufacturing method and intermediate material like coating, a washer described as
‘ bright’ or ‘ black’ need not be so in appearance.

The permissible dimensional, positional and form variations specified in the, earlier version
have been altered and conform to IS0 tolerances, and the method of representation also
follows the internationa! system.

d) A clause is also included on testing of material and coating. It may be added that testing
of material in the case of washer is rarely necessary unless in exceptional circumstances,
for example, when special requirements are to be met by the material.

4 The clause on packing has been revised making a distinction between packing ‘ ordinary ’
and ‘ precision ’ washers.

In the preparation of this standard, considerable assistance has been derived from DIN 522
Scheiben; Technische Lieferbedingungen (Washers, technical conditions of delivery), 1974 issued.
by Deutsches lnstitut fur Normung (DIN 1.

4
Reprography Unit, MS, :iew Deihi, ixiia