- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lock nut
The lock-nut D holds the screw securely once the pressure is adjusted.Practical Lithography