Fastener SuperStore, Inc. Machine Screw 422708

4-40 X 3/8 Machine Screws / Torx(R) / Flat Head / 18-8 Stainless Steel A straight shank fastener with external threads designed to go through a hole or nut that is pre-tapped to form a mating thread for the screw. Machine screws form a fastening superior in strength to spaced thread screws. Zinc yellow screws are popular in electronics applications. Stainless steel machine screws are used in applications which require general atmospheric corrosion resistance, in food processing machinery and refrigeration equipment. Stainless is also superior to steel in withstanding some elevation in application operating temperature while maintaining its strength.