precision ground and hard chromed plated to close tolerance. The chromed hardness is controlled at 66-70 HRC. Standard material in CK45(DIN) or S45C(JIS). The rod is manufactured to withstand a corrosion resistance standard of minimum 120 hours of Neutral Salt Spray (NSS) test achieving rating 9 in accordance to ISO 4540 / ISO 9227. Special high corrosion resistance rod in stainless steel or CK45 with Nickel + hard chrome plated is also available. Check with us if you have such requirement