Locknut

lock nut

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. See illus. under nut.
Also, locknut.


Origin:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
locknut (ˈlɒkˌnʌt)
 
n
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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