Cotter pin may refer to:
In U.S. usage:
- Split pin, a metal fastener with two tines that are bent during installation used to fasten metal together, like with a staple or rivet
- Hairpin cotter pin, more commonly known as an "R-clip"
- Bowtie cotter pin, a vibration-proof type of R-clip that is shaped like a bowtie
- Circle cotter, a ring-shaped cotter pin
In British usage:
- Cotter (pin), in mechanical engineering a pin or wedge passing through a hole to fix parts tightly together
This usage difference is often a cause of confusion when companies of both countries work together.
The original design for the cotter pin was designed by Dr. Rudolf Cotter in 1834. The original design employed a bolt with a hole drilled through and shank of metal placed with in the hole.
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