A bolt whose head has a hexagonal socket.

A type of bolt with a rounded head and a square shank which will not turn.

plural of Allen bolt

(climbing) A bolt permanently fixed to a rock face to allow climbers to attach ropes etc

Alternative form of bolthole

Alternative form of eyebolt

A type of firearm action in which the weapon's bolt is operated manually by the opening and closing of the breech with a small handle, most commonly placed on the right-hand side of the weapon.

(nautical) Rope sewn around the edges of a sail to prevent tearing or fraying.

(idiomatic, slang) A piece of machinery that is not worth more than its scrap value, often an old car.

a metal fixing in the shape of the letter U, which has a pin or screw bolt closure which fits across the two ends making a closed clamp