DIN 933 hexagon head screw, M20 x 130, en 10204 3.1 certificate, Article number 933B7201301. Property class / material: astm a193 b7, surface finish zinc plated. 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.