Hex flange forging nuts 1, material: CK45;SAE1045;GB45 or according to your requiry 2, surface: natural color after ball blast Hex flange forging nuts1, material: CK45;SAE1045;GB45 or according to your requiry2, surface: natural color after ball blast3, non-standard fasteners4, we can do all type as your requiry5, we have passed ISO9001:2008