ISO 4762 socket head screw with hex drive, M4 x 20, Article number 47621204020GEO500B. Property class / material: steel 12.9, surface finish zinc flake, silver. 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.