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castellated nut
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.
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Word History and Origins
Origin of castellated nut1
First recorded in 1900–05
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Example Sentences
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 Project Gutenberg
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