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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for allen key

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.

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1961's 21st Century Lexicon
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