High Strength Alloy Steel Grade 12.9 Black Oxide Hex Allen Key Bolt Tapered Bolt Cylinder Head Bolt Hexagon Socket Head Screw

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In 1919, Dyke defined them as screws that are threaded all the way to the head. A socket cap screw, also known as a socket head capscrew, socket screw, or Allen bolt, is a type of cap screw with a cylindrical head and hexagonal drive hole.

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