Bolt
small metal rods used as fasteners having a head and often helical threading and being usually secured by a nut or by riveting From Wikipedia, the free encyclopedia
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A bolt is a form of grooved fastener with an external helical male thread that engages the interior female thread of a nut. Bolts are closely related to and often confused with screws.[1]
A screw is different from a bolt because it does not take a nut, and its helical thread is used to penetrate (cut into) a softer material (such as wood).
This distinction is not always clear, and screws are someimes regarded as bolts without a nut.
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References
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