ISO 10642 flat head screw with hex drive, M20 x 40, Article number 799110200402. Property class / material: steel 10.9, surface finish hot-dip galvanised (iso fit). Flat Head Screw with Hex Drive manufactured to ISO 10642 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.