locknut
noun
- a thin nut screwed down hard on an ordinary nut to prevent the latter from working loose
- a specially designed nut that locks itself when screwed down tight
See locknut in American Heritage Dictionary 4
also lock nut (lŏkˈnŭtˌ)
noun- A usually thin nut screwed down on another nut to prevent it from loosening.
- A self-locking nut.
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