Buyer label offered ISO and SGS Certificate Good reputation Material : 50Mn , 42CrMo Excavator Slewing Rings Bearing Volvo: EC210, EC210B, EC330B, EC360B, EC460BDeere: 160C, 200C, 790, 790D, 790E, 792, 792D, 230LC, 230C, 270LC, 270C, 892E, 330LC, 330C, 370LC, 992D, 992E, 450LC, 450CHitachi: ZX160, ZX200, EX200-1, EX200-2, EX200-3, EX200-5, EX220-1, EX220-3, EX220-5, EX230-5, EX270-1, EX270-5, ...