ISO 4762 socket head screw with hex drive, M16 x 55, oversize, Article number 476210160552O. Property class / material: steel 10.9, surface finish hot-dip galvanised. Socket Head Screw with Hex Drive manufactured to ISO 4762 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.