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lock washer

noun
1.
a washer placed under a nut on a bolt or screw, so made as to prevent the nut from shaking loose.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for lock washer
  • Each anchor bolt shall be furnished with two nuts, two flat washers, and one lock washer.
  • The setscrew does not have a lock washer or other mechanism to keep it in place.

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