... thickness:1.5-9.5mm A series 50 short pitch industrial roller chain 1.material:40MN/A32.pitch range:1270-76.20mm3.plate ... . O-Ring Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8 ... chains: A0,A1,A3,A4,A5,A66. O-ring chains and xw-chains: 420,428,520,525,530,630 (Racing Chains ...