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lock nut

or locknut

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.
Origin of lock nut
1860-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for locknut
Historical Examples
  • A locknut is used to hold the screw in any desired position.

    Measuring Tools Unknown
  • A locknut is used beneath the notched nut to hold the adjustment.

  • 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.

British Dictionary definitions for locknut


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
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