... Hardness: HRC26-36, Products:Our products including Wheel Bolt & Nut, Truck Bolt & Nut, Hub Bolt & Nut, Plow Bolt & Nut, Track Pin & Bushing, King Pin Kits ... Class, Hardness: HRC26-36,fully hardened and tempered to match bolt strengthMaterial:S45/40Cr.Surface:Black oxide, Blue Zinc plating, Trivalent ... 32-51120,4323872,135-32-11211,4247132 manufacture forged bolts/Truck bolt for Hino, Mitsubishi,volvo