08B B Series Roller Chain 1.material:40MN/A3 2.pitch:12. ... thickness:1.60mm 4.color:natural.black.blue.yellow 08B B Series Roller Chain 1.material:40MN/A32.pitch:12.700mm3 ... chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6,SC8,SC105. PIV ...