DIN 935 hexagon slotted castle nut, M20 x 1.5, Article number 935201501. Property class / material: steel class 6, surface finish zinc plated. Hexagon Slotted Castle Nut manufactured to DIN 935 with ISO metric (M) thread, fine pitch, fully threaded. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution.