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Button Socket Head Cap Screw
A button socket head cap screw is a button shaped head with a hexagonal drive hole. The term socket head capscrew typically refers to a type of threaded fastener whose head diameter is nominally 1.5 times that of the screw shank (major) diameter, with a head height equal to the shank diameter. Forged heat-treated alloy examples are high strength fasteners intended for the most demanding mechanical applications.