Allen screw

noun
Al·​len screw | \ ˈa-lən- How to pronounce Allen screw (audio) \

Definition of Allen screw

hardware
: a screw with a hexagonal socket in its head that is designed to be used with an Allen wrench

First Known Use of Allen screw

1917, in the meaning defined above

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The first known use of Allen screw was in 1917

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