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Captain Harley

Allen Head Bolts/Screws....

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According to Google:


"In 1909–1910, William G. Allen patented a method of cold-forming screw heads around a hexagonal die (U.S. Patent 960,244). ... Hallowell does describe, however, the same inspiration also mentioned in connection withAllen for a wave of adoption of the hex socket head, beginning with set screws and followed by cap screws."



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Thanks guys!  I knew Phillips Head screws came out in 1936, but always wondered about the Allen Head design.


Captain Harley 😉

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