... :1.5-9.5mm A series 50 short pitch industrial roller chain 1.material:40MN/A32.pitch ... life duration and high strength7.pre-stretched and anti-fatigue8.sound quality,reasonable price and prompt ... : 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5 ... (Racing Chains)7. Leaf chains: LH series8. Double pitch conveyor chains with attachments: 2040,2050,2060,20809 ...