Washer 1, DIN125 DIN127 DIN9021 DIN7349 DIN7980 DIN433 DIN440 2, B.S.3410 USS SAE etc 3, Stainless steel and Carbon steel Washer1, Stainless steel A2 and A42, Carbon steel   Surface in steel: Plain; Zinc blue; Zinc yellow; Black3, Packing as customers' requirement4,...