A wrench made from a straight or bent hexagonal rod, used to turn an Allen screw.

Related Terms

OPEN-END WRENCH

A wrench consisting of fixed jaws at one or both ends of a handle.

MONKEY WRENCH

A wrench having one jaw fixed and the other adjustable, both of which are perpendicular to a straight handle.

IMPACT WRENCH

A compressed-air or electrically operated wrench that gives a rapid succession of sudden torques.

HEXAGONAL-HEAD BOLT

A standard wrench head bolt with a hexagonal head.

STILSON WRENCH

A STILSON wrench used to clamp and fasten on round or worn surfaces. It finds its grip and is self-locking but leaves marks on the surface. Not to be used on nuts in good condition.
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TORQUE WRENCH

Wrench with adjustable torque limit. Used to ensure even and uniform tension is applied while tightening.

PLUG SPANNER

A dedicated socket wrench used for fitting spark plugs.

ADJUSTABLE WRENCH

A wrench with one jaw which is fixed and another which is adjustable; the size is adjusted by a knurled screw.

ALLIGATOR WRENCH

A wrench having fixed jaws forming a V, with teeth on one or both jaws.

BOX WRENCH

A closed-end wrench designed to fit a variety of sizes and shapes of bolt heads and nuts.

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