Castellated nut

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A castellated nut (center) used on the hub of an automobile wheel, with a cotter pin installed to keep the nut from loosening.
A castellated nut (center) used on the hub of an automobile wheel, with a cotter pin installed to keep the nut from loosening.

Castellated nuts are nuts designed to be used with cotter pins. The bolt onto which such a nut is threaded should have a hole drilled through it, and the nut should be turned so that its castellations line up with this hole before a cotter pin is installed. The cotter pin then locks the nut in place by preventing it from turning.

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