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Product Description A flat head socket cap screw is a screw with a flat head and hexagon drive for tightening 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 flat head socket cap screw is a screw with a flat 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.