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WordReference Random House Unabridged Dictionary of American English © 2024machine′ bolt′, - Mechanical Engineering, Buildinga threaded fastener, used with a nut for connecting metal parts, having a thread diameter of about ¼ in. (6.4 mm) or more and a square or hexagonal head for tightening by a wrench. Cf. cap screw, machine screw, stove bolt. See illus. under bolt 1.
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