... 1.material:40MN/A3 2.pitch:25.4mm 3.plate thickness:3.20mm 80 roller chain A Series 16A-1 ... , 520, 520H, 530, 530H, 05MA, 05MB, 05MC, 06MC 2. O-Ring Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains ... chains: 25NP,35NP,41NP,40NP,50NP10. Coupling chainsThe Chain technic treatment is as below:1.Shot peening2.Bluing3. ... .Carburizing8.Quenching9.Tempering10.Oiling11.Greasing Roller driving chain