lock nut

lock nut

noun Machinery.
1.
a nut specially constructed to prevent its coming loose, usually having a means of providing extra friction between itself and the screw.
2.
Also called jam nut. a thin supplementary nut screwed down upon a regular nut to prevent its loosening. See illus. under nut.
Also, locknut.


Origin:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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