locknut

lock nut or lock·nut EXAMPLES|WORD ORIGIN noun Machinery. a nut specially constructed to prevent its coming loose, usually having a means of providing extra friction between itself and the screw. Also called jam nut. a thin supplementary nut screwed down upon a regular nut to prevent its loosening. Liberaldictionary.com

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Origin of lock nut First recorded in 1860–65 Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019 Examples from the Web for locknut Historical Examples of locknut

A locknut is used beneath the notched nut to hold the adjustment.

The Boy Mechanic, Book 2

Various

A locknut is used to hold the screw in any desired position.

Measuring Tools

Unknown

When the bolt has been screwed down sufficiently tight a locknut may be put on, or the first nut soldered to the end of the bolt.

The Boy Mechanic, Book 2

Various

British Dictionary definitions for locknut locknut noun a supplementary nut screwed down upon a primary nut to prevent it from shaking loose a threaded nut having a feature, such as a nylon insert, to prevent it from shaking loose Collins English Dictionary – Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012