Bolt

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]

Nut and bolt

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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References
  1. "Definition of BOLT". www.merriam-webster.com.
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