Cotter Pins

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A cotter pin, also known as a split pin, is a metal fastener with two tines that are bent during installation. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.

Cotter Pins Applications 

Cotter pins are most commonly used to lock castle and slotted nuts or secure a clevis pins as well as wheel or machine components on an axle.  Cotter pins are easy to install and remove. A split pin has two long tines that are bent to hold it in place. Hairpin clips, also called r clips, are designed to slip on with no bending required.

 

American cotter (split) pin sizes

Nominal diameter

Hole size

For bolt size

in

mm

in

mm

in

mm

132

0.79

364

1.19

   

364

1.19

116

1.59

   

116

1.59

564

1.98

14

6.35

564

1.98

332

2.38

516

7.94

332

2.38

764

2.78

38

9.53

764

2.78

18

3.18

   

18

3.18

964

3.57

12

12.70

964

3.57

532

3.97

58

15.88

532

3.97

1164

4.37

34

19.05

316

4.76

1364

5.16

1, ​1 18

25.4, 28.58

732

5.56

1564

5.95

​1 14, ​1 38

31.75, 34.93

14

6.35

1764

6.75

​1 12

38.10

516

7.94

516

7.94

​1 34

44.45

38

9.53

38

9.53

   

716

11.11

716

11.11

   

12

12.70

12

12.70

   

58

15.88

58

15.88

   

34

19.05

34

19.05

   

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