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lock nut

or lock·nut

See more synonyms for lock nut on Thesaurus.com
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.
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Origin of lock nut

First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for lock nut

Historical Examples

  • The lock-nut D holds the screw securely once the pressure is adjusted.

    Practical Lithography

    Alfred Seymour