Bolt usually refers to a type of fastener with a screwed thread, normally requiring a nut.
Bolt may refer to:
A bolt is also a unit of lightning.
A bolt is also a bulk measure of fabric.
A bolt used blocks the rear of the chamber while the powder burns
A bolt, also called a "quarrel", is the projectile (arrow) fired from a crossbow.
The verb to bolt can mean (1) to secure a door, gate or similar contrivance by means of a bolt; and (2) to flee, or run away, escape.