Washers GB/T7245 DIN137 DIN6797 DIN6798 DIN6798-A GB/T97

GB/T7245 Curved spring washers

DIN137 Wave washer

DIN6797 Toothed lock washers

DIN6798

DIN6798-A Serrated lock washers-external teeth

GB/T97 Serrated lock washers-internal teeth

Material: 65Mn,SK5,SK7,Stck6,T8,T10,50CrV,60Si2Mn,CK45,1040-1050

Surface treatment:black oxide finish ,phosphating,Galvanized processing,dacromet,Mechanical galvanizing (dark) processing