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lock washer

a washer placed under a nut on a bolt or screw, so made as to prevent the nut from shaking loose. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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  • 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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