... 4.ISO9001:2008 Detailed Production Description(16B-2) durable duplex roller chains &chain manufacturer B series1)material : 40mn2)pitch : 25. ... )motorcycle chains :428,428H,530,530H,630,630H3)short pitch conveyor roller chain attachments:A-1,A-2.K-1,K-2 ... pitch transmissions v& conveyor chains :2040,2050,2060,20805)leaf chains:LH series,AL series6)stainless steel roller chains7)simplex,double,triplex ...