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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
First recorded in 1860-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for lock nut
Historical Examples
  • A lock nut should be used in conjunction with this set screw.

  • A lock nut, O, should be provided for this screw so that it will remain in adjustment.

  • When this adjustment is secured the lock nut is screwed in place so the needle valve will keep the adjustment.

    Aviation Engines

    Victor Wilfred Pag
  • The second nut is technically known as a “jam nut,” or “lock nut.”

    The Scientific American Boy

    A. Russell (Alexander Russell) Bond
  • Then a coupling is cut while screwed on a pipe, so that a lock nut about 1⁄2 inch wide is made.

    Elements of Plumbing Samuel Dibble
  • A lock nut (H), which has corresponding projections (IJ) is slipped over the post as shown at , and is given a quarter turn.

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