... time 3.Made Style:Manufacture and OEM Industiral Roller chain ,Main products as the following: 1.Motorcycle Chains ... chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5, ... 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below:1.Shot peening2.Bluing3 ... .Carburizing8.Quenching9.Tempering10.Oiling11.Greasing roller chain a series