The Hillman Group The Hillman Group 3712 0-80 x 1/2 In. Stainless Steel Pan Head Phillips Machine Screw (50-Pack) Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten metal parts together If nuts are needed, use with nuts of the same finish and threading for proper fit Fasten with a screwdriver to reduce the risk of over-tightening to protect the screw and fastened material Stainless steels are used for their corrosion resistance, high-temperature strength, scaling resistance and low-temperature toughness