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noun, Machinery.
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.
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


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