... :2008 Detailed Production Description(16B-2) durable duplex roller chains &chain manufacturer B series1)material : 40mn2)pitch : 25.4mm3)plate thickness ... :428,428H,530,530H,630,630H3)short pitch conveyor roller chain attachments:A-1,A-2.K-1,K-2,SA ... chains:LH series,AL series6)stainless steel roller chains7)simplex,double,triplex chains If you are interested in our products.Pls ...