(Mech.)	a secondary nut, screwing down upon the primary nut to secure it.
	a nut which is screwed up tightly against another nut on the same bolt or screw, in order to prevent accidental unscrewing of the first nut.

See also: Check, Nut

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.

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References in periodicals archive

Initial examination revealed brake master cylinder piston rod (p/n 0541143) was broken below its clevis check nut (p/n 0541140).

Brake Master Cylinders

The Thumb Nut series of thumbscrews with internal female thread can be used as a stand-alone thumbscrew or in conjunction with the company's Instant Thumbscrew Knob to create a thumbscrew with a check nut, thereby facilitating locking down an adjustment.

Female threaded thumb nuts

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Check nut