... .4mm 3.plate thickness:3.20mm 80 roller chain A Series 16A-1 1.material:40MN/A32.pitch:25. ... chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105 ... 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