DIN 934 hexagon nut, M30, en 10204 3.1 certificate, Article number 9341030CGEO500. Property class / material: steel class 10, surface finish zinc flake, silver. Hexagon Nut manufactured to DIN 934 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.