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locknut

British  
/ 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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

One of the parts was a locknut that secures the rotor on the Kiowa attack helicopter.

From Washington Times • Dec. 13, 2014

A locknut keeps the packing nut from loosening.

From Time Magazine Archive

You must first back off the locknut when tightening or loosening the packing nut.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.