IS : 549 - 1974

(Reaffirmed 1996)
Edition 3.4
UDC 621.886.55 (1991-01)

Indian Standard
SPECIFICATION FOR
SPLIT PINS
( Second Revision )
(Incorporating Amendment Nos. 1, 2, 3 & 4)

1. Scope — Prescribes requirements for split pins of nominal size 0.6 to 20 mm.
2. Nomenclature
2.1 Nominal Length ( l ) — The nominal length is the distance from underside of the eye to the
extreme end of the short leg ( see also Appendix A ).
Bolts, Nuts and Fasteners Accessories Sectional Committee, EDC 27 [ Ref: Doc: EDC 27 (2128) ]

2.2 Nominal Size — The nominal size is the diameter of the hole for receiving the split pins.
3. Dimensions
3.1 The dimensions of the split pins shall be as given in Table 1.
3.2 The preferred length size combinations shall be as given in Table 2.
3.3 The permissible tolerances on the dimensions shall be as indicated in Table 1.
4. Material — Unless otherwise specified, split pins shall be manufactured from half round mild
steel wires conforming to IS : 10794-1984 ‘Mild steel wire for cotter pins’.
5. Finish — Split pins shall be supplied with bright self colour finish unless otherwise specified by
the purchaser. The end of each leg shall be bevelled and shall be free from burrs. The eyes shall be as
round in shape as possible and shall blend into the legs without sharp notches.
6. Designation
6.1 A split pin shall be designated by the nominal size, nominal length, the number of this standard
and material (for other than steel only).
Example 1:
A split pin of nominal size 5, nominal length 50 mm and made of steel, shall be designated as:
Split Pin 5 × 50 — IS : 549
Example 2:
A split pin of nominal size 10, nominal length 80 mm and made of brass, shall be designated as:
Split Pin 10 × 80 — IS : 549 — Brass
7. Shank — The shank shall be straight with both legs parallel throughout the nominal length.
8. Sampling — Sampling and acceptance criteria shall conform to IS : 6821-1973 ‘Methods for
sampling non-threaded fasteners’.
9. Test
9.1 Bending Test — The split pins with nominal diameters up to and including 5 mm shall withstand
being bent twice through an angle of 180° round a former diameter equal to nominal diameter
without showing any sign of fracture.
9.2 The split pins with nominal diameters over 5 mm shall withstand being bent once through an
angle of 180° round a former diameter equal to nominal diameter without showing any sign of
fracture.
10. Packing — Split pins shall be packed in cartons and/or wooden boxes with quantity as specified
below:
Nominal Diameter Quantity in
mm Each Carton/Wooden Box
(Numbers)
Up to and including 2 1 000
2.5, 3.2 and 4 500
5 and 6.3 200
8 and 10 100
13, 16 and 20 50

Packages shall be made in such a way that they are protected against mechanical damage in transit.

Adopted 3 January 1974 © BIS 2002 Price Group 2

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN , 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
 IS : 549 - 1974
TABLE 1 DIMENSIONS OF SPLIT PINS
( Clauses 3.1 and 3.3 )
All dimensions in millimetres.

Nominal Size
Dimension 0.6 0.8 1 1.2 1.6 2 2.5 3.2 4 5 6.3 8 10 13 16 20
Max 0.5 0.7 0.9 1 1.4 1.8 2.3 2.9 3.7 4.6 5.9 7.5 9.5 12.4 15.4 19.3
2

d
Min 0.4 0.6 0.8 0.9 1.3 1.7 2.1 2.7 3.5 4.4 5.7 7.3 9.3 12.1 15.1 19
Max 1.6 1.6 1.6 2.5 2.5 2.5 2.5 3.2 4 4 4 4 6.3 6.3 6.3 6.3
a
Min 0.8 0.8 0.8 1.2 1.2 1.2 1.2 1.6 2.0 2.0 2.0 2.0 3.1 3.1 3.1 3.1
b ≈ 2 2.4 3 3 3.2 4 5 6.4 8 10 12.6 16 20 26 32 40
Max 1 1.4 1.8 2 2.8 3.6 4.6 5.8 7.4 9.2 11.8 15 19 24.8 30.8 38.6
c
Min 0.9 1.2 1.6 1.7 2.4 3.2 4 5.1 6.5 8 10.3 13.1 16.6 21.7 27 33.8
Over — 2.5 3.5 4.5 5.5 7 9 11 14 20 27 39 56 80 120 170
Bolts
Corresponding
Up to 2.5 3.5 4.5 5.5 7 9 11 14 20 27 39 56 80 120 170 —
Diameter d1 Over — 2 3 4 5 6 8 9 12 17 23 29 44 69 110 160
Clevis Pins*
Up to 2 3 4 5 6 8 9 12 17 23 29 44 69 110 160 —
v Min 3 3 4 5 5 6 6 8 8 10 12 14 16 20 25 32
*For railway applications and in cases where split pins in clevis pins are subjected to alternating transverse forces, it is recommended to use the next larger split pin size to that
specified in above table.
 IS : 549 - 1974
TABLE 2 PREFERRED LENGTH — SIZE COMBINATION
( Clause 3.2 )
All dimensions in millimetres.
1 Nom NOMINAL SIZE
± 1/2 IT 17 0.6 0.8 1 1.2 1.6 2 2.5 3.2 4 5 6.3 8 10 13 16 20
4
5
6
8
10
12
14
16
18
20
22
25
28
32
36
40
45
50
56
63
71
80
90
100
112
125
140
160
180
200
224
250
280
Note — Sizes between the bold lines are preferred.

11. Marking — Each carton shall be labelled with the manufacturer’s name or initials or
trade-mark, description of contents, particulars of quantity and size of split pins.
11.1 ISI Certification Marking — Details available with the Indian Standards Institution.

APPENDIX A
( Clause 2.1 )
SPLIT PIN LENGTH GAUGE
A-1. Length Gauge — The lengths of the split pins may be determined by means of a split pin
gauge as illustrated below:

3
IS : 549 - 1974

EXPLANATORY NOTE
This standard is in full agreement in regard to dimensions with ISO/R 1234-1971 ‘Split pins —
Metric series’, issued by the International Organization for Standardization.

This edition 3.4 incorporates Amendment No. 3 (December 1983) and Amendment No. 4
(January 1991). Side bar indicates modification of the text as the result of incorporation of the
amendments.