1
: a nut screwed down hard on another to prevent it from slacking back
2
: a nut so constructed that it locks itself when screwed tight against another part
Examples of locknut in a Sentence
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Secure the air intakes at the barrel's base by threading the pipe locknuts onto the close nipples.
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Joe Kohl-Riggs, Popular Mechanics, 27 July 2023
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Joe Kohl-Riggs, Popular Mechanics, 27 July 2023
Cite this Entry
“Locknut.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/locknut. Accessed 10 Sep. 2025.
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