... according to the customer's requirements. 1.Mod: M1, M1.5, M2, M2.5, M3, M4, M5, M6, M7, M8, M10. M12 2.Length: 500 ~ 4000mm. 3 ... alloy, bronze, brass, chrome, 40Cr, 20CrMnTi, Steel 1020, Steel 1045. 5.Surface treatment: Carburizing, hardening and tempering, nitriding, high frequency treatment ...