Allen bolt

noun Al·len bolt \ˈa-lən-\

Definition of Allen bolt


  1. :  a bolt with a hexagonal socket in its head that is designed to be used with an Allen wrench The Allen bolt is integral to the crank and remains in it when the crank is removed from the spindle. — Eugene A. Sloane, Sloane’s New Bicycle Maintenance Manual, 1981

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Origin and Etymology of allen bolt

Allen Manufacturing Co., Hartford, Connecticut

First Known Use: 1972

Seen and Heard

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to criticize severely

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