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Product Description A socket head cap screw is a screw with a round head and hexagon drive for tightneing with an Allen-style wrench. This screw carries a recessed internal socket drive to add strength. Used on machine parts or manufacturing equipment. From the Manufacturer A socket head cap screw is a screw with a round head and hexagon drive for tightneing with an Allen-style wrench. This screw carries a recessed internal socket drive to add strength. Used on machine parts or manufacturing equipment.