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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
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