What is a cotter joint?

Cotter joint These types of joints are used to connect the end of a rod or bar to a shaft. The end of the bar has a hole in it and it is called a lug. The hole carries a shaft.

This shaft is locked in place by a smaller pin that passes through the side of the lug and partly or completely through the shaft itself. This locking pin is named a cotter, which sometimes is also applied to the whole joint The obvious example is on a bicycle where both pedal bars are separately locked by a cotter pin, on their common driving shaft having the sprocket wheel Steel is the most common material used for this application. There are no specific manufacturing companies who make only cotter pins, nor are there any dimensional standards by which they are designed.

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