Bolt standard available in DIN933,IFI C-6,C-10,DIN558, ... available in stainless, brass DIN931 Carbon Hex Cap Screws and Bolt:1, Over 15years manufacturer and export experience; 2, Cooperate with ... carbon, high tensile and alloy;4, Working process include: cold forged, hot forged, and machining, also CNC machine, can do OEM order ...