... : 50Mn , 42CrMo Focus on Customers Excavator part slewing ring Kato , Komatsu , Hitachi Excavator part slewing ringCaterpillar : CAT320B CAT320C CATE200B ... ZX230,ZX240,EX300-1,EX3003,EX220-1,UH083,UH063,Komatsu : PC60-6,PC60-7, PC100-5,PC120-5 ... ,PC300-7,PC350-6,PC360-6,PC400-6,PC450,PC200-1,PC300-2,PC40,DH55-7,DH220- ... DH320,DH10L,DH300-5,DH280,DH290 Kato , Komatsu , Hitachi Excavator part slewing ring