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jam nut

 - 2 dictionary results

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.
Also, locknut.


Origin:
1860–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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