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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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British Dictionary definitions for locknut

locknut

/ˈlɒkˌnʌt/
noun
1.
a supplementary nut screwed down upon a primary nut to prevent it from shaking loose
2.
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
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