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

    Practical Lithography Alfred Seymour

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