Purpose of cotter pin is

Fasten the shaft

Prevent cotter from dropping off

Prevent nut from loosening

Keep splines from loosening

A cotter pin is a simple fastener that’s used to secure a bolt in place.
Consisting of a U-shaped piece of metal, it’s inserted through the hole of a bolt, after which the ends are twisted together.
The cotter pin secures the bolt in place so that it’s less likely to loosen and come out.

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