castellated nut

American

noun

a tall lock nut, having on its outer face radial slits allowing for insertion of a cotter pin or wire in both the nut and a hole in its bolt, so as to prevent the nut from coming loose.

Etymology

Origin of castellated nut

First recorded in 1900–05

Example Sentences

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castellated nut

On every bolt use a castellated nut and a cotter pin, or an ordinary nut and a lock washer, so the bolt will not work loose.

From Aviation Engines Design?Construction?Operation and Repair by Victor Wilfred Pag?

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023