nut and bolt Hexagon Nuts with black,zinc ,HDG Standard: DIN934(555, 936),ANSI18.2.2, BS916 2) Material: Carbon steel nut and boltSize ... range: M3 to M30 hex nut Materials: carbon and alloy steel Platings: black oxide, zinc, chrome, galvanized, nickel, dacromet, ... delta-tone, geomet and ruspert Grade: 4, 6, 8 and 10Standard: DIN934(555, 936),ANSI18.2.2, BS916 ...