lock nut

or locknut

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.

Word History and Origins

Origin of lock nut¹

First recorded in 1860–65

Example Sentences

This collar is threaded upon c and is locked in position by a ring lock nut j′.

From Project Gutenberg

To adjust: Loosen lock nut "A," remove clevis pin "C" and turn yoke "B" to obtain proper length.

From Project Gutenberg

Loosen eccentric lock nut "A" and turn eccentric "B" in the direction the wheel rotates when the car is moving forward until the feeler is held snugly between the drum and the lining.

From Project Gutenberg

Insert clevis pin and tighten lock nut "A."

From Project Gutenberg

Hold the eccentric in this position and tighten lock nut "A."

From Project Gutenberg