... welcome 4.ISO9001:2008 Detailed Production Description140 duplex roller chain factory(28A-2R)1)material : 40mn2)pitch:44.45mm3)plate ... thickness:5.4mm4)color : nature,black,blue,yellow5)factory price without middle man6)standard:ISO/ DIN /ANSI7)good ... v& conveyor chains :2040,2050,2060,20805)leaf chains:LH series,AL series6)stainless steel roller chains7)simplex,double,triplex ...