Standards ASTM B160 F1554 ASME SB160 SF1554 Dimensions DIN 931 933 934 7991 976 125 ASME B1821 B183 Fasteners size Bolt Screw Size M3 M56 36 to 2 Custom Sizes Nuts Size M3 M56 36 to 2 Custom Sizes Washers Size M3 M56 36 to 2 Custom Sizes Machine Screws Size M16 M12 Self Tapping Screw Size No2 No 14 Length 3 mm to 200 mm Threads UNF BSW BSF METRIC UNC or as required Surface Coating Ptfe Coated Fasteners Phosphate Coating Teflon Coating Zinc Coating Hot Dipped Galvanizing Coating Cadmium Coating Xylon Coating Finishing SelfColour Passivated Bright Zinc Plated BZP Hot Dip Galvanised HDG Sherardized some special one like DACROMET Geometry and Mechanically Applied coating Dacroment nickel plated anodizing plated zincnickel Zinc blue black yellow white black oxide