Hexagon Socket Cap Screw Standard: DIN 912 ISO4762-1977Fasteners Material: Carbon Steel for grade 4.8, 8.8, 10.9, 12.9. Stainless Steel ( S. S201, S. S304 ) without Magnetic Finish: Plain ( Self color ), Zinc ( zinc blue, zinc white, zinc yellow ). Black Fasteners Mechanical performance: 8.8/10.9/12.9Size: Diameter M3-M36 Length: 6-200mm Hexagon Socket Cap Screw