Split cotter pins

Ferrous and non ferrous split cotter pins are covered by BS 1574. The designating size of a split cotter pin is the size of the hole for which it is intended to fit. When reference is made to a split cotter pin in a parts list, this nominal dimension is followed by the length required. The closed legs of the shank of the pin form a circular cross section. The legs should be straight and parallel throughout their nominal length. Figure 16.32 shows alternative pins in detail.

b Nominal length L

Enlarged view on section XX

Alternative shape eye permissible -

Alternative shape eye permissible -

Alternative shape of end permissible

Enlarged view on section XX

Alternative shape of end permissible

Fig. 16.32 Proportions of split cotter pins to BS 1574

Table 16.15 Split cotter pin dimensions

Nominal

Outside

Length

diameter of

Shank

diameter

Length

extended

pin (hole)

diameter

of eye

of eye

prong

diameter

d

c

b

a

1.0

0.9

1.8

3.0

1.6

1.2

1.0

2.0

3.0

2.5

1.6

1.4

2.8

3.2

2.5

2.0

1.8

3.6

4.0

2.5

2.5

2.3

4.6

5.0

2.5

3.2

2.9

5.8

6.4

3.2

4.0

3.7

7.4

8.0

4.0

5.0

4.6

9.2

10.0

4.0

6.3

5.9

11.8

12.6

4.0

8.0

7.5

15.0

16.0

4.0

10.0

9.5

19.0

20.0

6.3

13.0

12.4

24.8

26.0

6.3

Exact dimensions are given in BS 1574 but for drawing purposes the following extracts will be useful where the maximum allowable sizes for dimensions a, b, c and d are quoted. Many standard lengths are obtainable for each pin size and as a rough guide between 5 and 25 times the shank diameter.

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    How to draw cotter pins?
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