Allen bolt

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

Definition of Allen bolt

: 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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First Known Use of Allen bolt

1972, in the meaning defined above

History and Etymology for Allen bolt

Allen Manufacturing Co., Hartford, Connecticut

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Time Traveler for Allen bolt

The first known use of Allen bolt was in 1972

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Comments on Allen bolt

What made you want to look up Allen bolt? Please tell us where you read or heard it (including the quote, if possible).


readily or continually undergoing change

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