locknut

/ ˈlɒkˌnʌt /

noun

a supplementary nut screwed down upon a primary nut to prevent it from shaking loose
a threaded nut having a feature, such as a nylon insert, to prevent it from shaking loose

When the bolt has been screwed down sufficiently tight a locknut may be put on, or the first nut soldered to the end of the bolt.

A locknut is used beneath the notched nut to hold the adjustment.

A locknut is used to hold the screw in any desired position.

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