... : 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- ... ,PC200-5,PC220-5,PC200-6,PC220-6(S6D95),PC200-7(S6D102),PC220-6(6D102),PC200-7, ... ,DH10L,DH300-5,DH280,DH290 Kato , Komatsu , Hitachi Excavator part slewing ring