lock nut

or locknut

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.

First recorded in 1860–65

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

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

Then a coupling is cut while screwed on a pipe, so that a lock nut about 1⁄2 inch wide is made.

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

The second nut is technically known as a “jam nut,” or “lock nut.”

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