Locknut



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.
/ˈlɒkˌnʌt/
noun
1.
a supplementary nut screwed down upon a primary nut to prevent it from shaking loose
2.
a threaded nut having a feature, such as a nylon insert, to prevent it from shaking loose

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