轴套材料：

直淬钢(Dierct harden steel): GCrlS ( 52100)  42CrMo (4140 )  45(1045)

渗碳钢(Carburizing steel): 20Cr ( 5120 )  20CrMo(4118)  20CrNiMo(8620H)

铜(Copper):ZCuZn24AI6Mn3Fe3  ZCuAI9Fe4Ni4Mn2

弹簧钢(Spring steel):65Mn  50CrVA  60Si2MnA

产品特点：外圆有两条椭圆槽