DIN 933 hexagon head screw, M16 x 20, Article number 933816020ZNTF105. Property class / material: steel 8.8, surface finish zinc-nickel, silver. Hexagon Head Screw manufactured to DIN 933 with ISO metric (M) thread, coarse 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.