A series 50 short pitch industrial roller chain 1.material:40MN/A3 2.pitch:12 ... .7-76.2mm 3.plate thickness:1.5-9.5mm A series ... 50 short pitch industrial roller chain 1.material:40MN/A32.pitch range ... Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6, ...