General Mill Supplies -- MRO - Fasteners - Screws - Socket Cap Screws

A socket cap screw is also known as socket head cap screw, socket screw or allen bolt is a type of cap screw with a cylindrical head and hexagonal drive hole. Socket cap screws are commonly used in machine parts, die fixturing and clamping. The socket head enables driving where there is not sufficient space for wrenches or sockets.

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