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 Pag?, Victor Wilfred

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