... offered Material : 50Mn , 42CrMo Focus on Customers Excavator part slewing ring Kato , Komatsu , Hitachi Excavator part slewing ringCaterpillar : CAT320B CAT320C CATE200B CAT320 SH120A1 ... -5,DH320,DH10L,DH300-5,DH280,DH290 Kato , Komatsu , Hitachi Excavator part slewing ring