cotter pin

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English[edit]

A split pin (UK usage) / cotter pin (USA usage) holding a rod in place with a washer.
A split pin (UK usage) / cotter pin (USA usage) installed within a castellated nut.

Noun[edit]

cotter pin (plural cotter pins)

  1. (US) A split pin, the ends of which project through an object being fastened and are bent back to hold it in place.
  2. (UK) A pin or wedge inserted through a slot to hold machine parts together; a cotter.


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