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, ... , 6, 8 and 10Standard: DIN934(555, 936),ANSI18.2.2, BS916 2) Material: Carbon steel Diameter: 5-20mm. HYFJ-006 nut and bolt