... chains for ANSI 60-3 1) material:40Mn 2) plate thickness:2.42mm 3) color:natural,black,blue ... ,yellow ANSI 60-23Aseries duplex roller chains(12A-3R)1)material : 40mn2)pitch ... 428H,520,530,630,25,25H3)short pitch conveyor roller chain attachments:A-1,A-2.K- ... with attachment series,6)simplex,double,triplex chainsThe chain technic is as bellow1)shot peening2)bluing3)phosphating4 ...