The Difference Between a Screw and a Bolt

Whether a fastener is a screw or a bolt is not determined by its head. Some people think that anything you turn with a screwdriver is a screw, and anything you turn with a wrench is a bolt. Not true. A bolt fastens into something that’s threaded, such as a nut, or a pre-threaded component. A screw makes its own threads, such as into sheet metal or wood. Whether a fastener is a screw or a bolt is not determined by its head.

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