Most people have encountered an Allen wrench (or Allen key). It’s the L - or S -shaped tool with a six-sided head that can ...

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An Allen wrench, AKA an Allen key or hex key, is a small hand tool used to fasten screws or bolts with a hexagonal socket.

The tool is, therefore, commonly known as a hex wrench or hex key. So how did Allen enter into it? Like most non-proprietary consumer products, it was an attempt at branding. In 1910, William G.