Allen key

an L-shaped tool consisting of a rod having a hexagonal cross section, used to turn a screw (Allen screw) with a hexagonal recess in the head. A different size of key is required for each size of screw

a hex head spanner designed to fit into and turn an Allen screw; also known as Allen wrench

The Allen key, screw, and wrench got their names from Allen Manufacturing Company in Hartford.
Word Origin



Read Also:

  • Allen screw

    a screw turned by means of an axial hexagonal hole in its head.

  • Allen test

    allen test Allen test n. A test for occlusion of the radial or ulnar artery, in which one of these arteries is compressed after blood has been forced out of the hand by clenching it into a fist; failure of the blood to diffuse into the hand when opened indicates that the artery not compressed […]

  • Allen wrench

    a wrench for Allen screws, formed from a piece of hexagonal bar stock bent to a right angle. noun See Allen key

  • Allen’s law

    allen’s law Allen’s law Al·len’s law (āl’ənz) n. The principle that, in contrast to a normal physiology, the more carbohydrate taken by a diabetic, the less carbohydrate is utilized.

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