ANSI/ASME B18.8.1 Cotter Pin Application Size Table Chart

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Cotter Pins per ANSI/ASME B18.8.1

A cotter is a pin or wedge passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning, but in the U.S. it refers to a different fastener .

Typical applications are in fixing a crank to its crankshaft , as in a bicycle, or a piston rod to a crosshead , as in a steam engine. Note: the angle of the wedge determines the position of the parts being held, therefore on a bicycle the pedal arms will only be at 180 degrees to each other if the angle of the cotter pin's wedge is the same on both pins.

NOMINAL
SIZE
A
Diameter
C
Head Diameter
D
Prong Length
LENGTH
.03125 0.032 0.060 0.010 0.125 to 3 by 1/8
.046875 0.048 0.090 0.020 0.125 to 3 by 1/8
.0625 0.060 0.120 0.030 0.25 to 3 by 1/8
.078125 0.076 0.160 0.040 0.25 to 3 by 1/8
.09375 0.090 0.190 0.040 0.375 to 3 by 1/8
.109375 0.104 0.220 0.050 0.375 to 3 by 1/8
.125 0.120 0.250 0.060 0.5 to 3 by 1/8
.140625 0.134 0.280 0.060 0.5 to 3 by 1/8
.15625 0.150 0.310 0.070 0.625 to 3 by 1/8

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