... Hardness:HRC45-50 3.Technology:straight knurling .milling groove bearing pin and shaft1.Material:Y40um /11442.Hardness:HRC45-°-50°3.Surface treatment ... , duplicator, a plastic machine, shredders, punching machine, currency counting machines and various electronic products. Material : carbon steel , stainless steel , aluminum ,brass , ... relation with you for long term, thank you ! bearing pin and shaft