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Nov 10, 2016

A bolt is a form of grooved fastener with an external male thread. Bolts are thus 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 sometimes screws are regarded as bolts without a nut.

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