lock nut

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also lock nut  (lŏk′nŭt′)
1. A usually thin nut screwed down on another nut to prevent it from loosening.
2. A self-locking nut.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

lock′ nut`

1. a nut specially constructed to prevent its coming loose, usu. having a means of providing extra friction between itself and the screw.
2. a thin supplementary nut screwed down upon a regular nut to prevent its loosening.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in periodicals archive ?
The focus is adjustable with a double nut mechanism enabled by lock nut plus locking screws.
Initially, I thought it was an E Model (so many sub models) because of the "E" stamped TDC in front of the barrel lock nut. But that same barrel lock nut is depicted in Gun Digest's exploded long-gun drawings as a C or CL Model.
Unscrew the lock nut and washer from the base of the fill valve (the water inlet pipe).
"The lock nut is generally left in the car, which doesn't really make sense," says Gurdip.
that takes a special cam lock nut. The cam can be repositioned in relation to the flutes on the chucked step tool by loosening the cam lock nut and rotating the cam on the spindle.
These front mount receptacles with front lock nut are designed for thread mount applications that need specific keyway orientations due to the space constraint or any other unexpected engineering situations.
Remove and save the screw and lock nut from the eyelet on the W16/W3 cable.
The Quickchange clamp allows simultaneous access to the tool, lock nut, set screw, and pull stud.
Then the spindle lock nut may back off in the hub assembly and your HMMWV could lose a wheel while moving.