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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. 2018.
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Examples from the Web for lock washer
Historical Examples
  • On every bolt use a castellated nut and a cotter pin, or an ordinary nut and a lock washer, so the bolt will not work loose.

    Aviation Engines

    Victor Wilfred Pag

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10
12
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