... 1.Motorcycle Chains: 25H (04CH), 415, 415H, 420, 420H, 428, 428H, 520, 520H, 530, 530H, 05MA, 05MB, 05MC, 06MC ... A5,A66. O-ring chains and xw-chains: 420,428,520,525,530,630 (Racing Chains)7. Leaf chains: ... : 25NP,35NP,41NP,40NP,50NP10. Coupling chains The Chain technic treatment is as below:1.Shot peening2.Bluing3. ... .Heat treatment7.Carburizing8.Quenching9.Tempering10.Oiling11.Greasing Chain Link