... -M20; 2). Grade: 4.8, 6.8, 8.8, 10.9, 12.9 3) Finish: zinc plated, balck Feature1). Size:M5-M20; 1 ... /4"-5"2). Grade:4.8, 6.8, 8.8, 10.9, 12.93). Material:stainless steel, carbon steel, brass, high tensile ... , black oxide5). Standards:DIN933, DIN931, IFI C-6, IFI C-10, DIN558, DIN601, ISO4014, ISO4017, DIN7990, DIN7991, DIN6914, ASTM A325, IFI ...