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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
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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10
12
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