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.
- 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.