... Chains: 25H (04CH), 415, 415H, 420, 420H, 428, 428H, 520, 520H, 530, 530H, 05MA, 05MB, 05MC, 06MC 2. O- ... Ring Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6 ... A66. O-ring chains and xw-chains: 420,428,520,525,530,630 (Racing Chains)7. Leaf chains: LH ... treatment7.Carburizing8.Quenching9.Tempering10.Oiling11.Greasing roller chain a series