... . 40Mn quality alloy steel2. carbonized harden 3. competitive price4. trend to long cooperation 5.antirust6.long-life duration and high strength7.pre-stretched ... 420H,428,428H,520,520H,6303)short pitch conveyor roller chain attachments:A-1,A-2.K-1,K-2,K ... and with H series5)agricultural chains:C212A series,ZGS38 combine chain series,3558T, rice harvester chains attachments6)simplex, duplex, triplex ...