Bolt (fastener)
Threaded fastener with an external male thread requiring a matching female thread
Bolt (fastener)
A bolt is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to a matching nut. The bolt has an external male thread requiring a matching nut with a preformed female thread.
Read on Wikipedia · Image Pavel Krok, CC BY-SA 2.5
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