ISO 4762 socket head screw with hex drive, M16 x 20, Article number 47621016020. Property class / material: steel 10.9, surface finish plain. Socket Head Screw with Hex Drive manufactured to ISO 4762 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.