Captain Harley Posted April 1, 2019 Share Posted April 1, 2019 In what year was allen head bolts/screws invented? Thank you Link to comment Share on other sites More sharing options...
keiser31 Posted April 1, 2019 Share Posted April 1, 2019 Google is your friend....https://en.wikipedia.org/wiki/Hex_key Link to comment Share on other sites More sharing options...
carbking Posted April 1, 2019 Share Posted April 1, 2019 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." Jon. Link to comment Share on other sites More sharing options...
hwellens Posted April 1, 2019 Share Posted April 1, 2019 Here is an ad. Been around about 100 years Link to comment Share on other sites More sharing options...
Captain Harley Posted April 2, 2019 Author Share Posted April 2, 2019 Thanks guys! I knew Phillips Head screws came out in 1936, but always wondered about the Allen Head design. Captain Harley 😉 Link to comment Share on other sites More sharing options...
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