DIN 609 hexagon head fit bolt, M12 x 50, Article number 6091012050GEO500A. Property class / material: steel 10.9, surface finish zinc flake, silver. Hexagon Head Fit Bolt manufactured to DIN 609 with ISO metric (M) thread, coarse pitch, partially 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.