Roller Chain 1.Quality standard:ISO9001 certificate 2 ... ).Materialsteel,20Mn2, Q235, Alloy3).Modle:simplex,duplex,triplex and so on4).Long service life5).Big Pitch , 20A ... equipment .We are the manufacturer of sprockets and machinery transmission parts.Main products include chains,sprockets ... belt pulleys, gears, bushes & hubs, pulleys, and others.We can supply different types of chainswith good ...