Hex Flange Bolt Standard : DIN912, ISO4762, ASTM A574, GBT70.1, etc. Material : Carbon Steel, Alloy steel, stainless steel Grade : 4.85.86.88.810.912.9A2A4 Surface Finish : Black Zinc Plated, Copper Plated, Phosphating, Mechanical Galvanising, Hot Dip Galvanised, Dacromat Coating Size : M6-M48;14-2