Bearing sleeve
Release date：2013-08-16 10:17 ???
Design characteristics：
With spiral grooves a pitch (two left,two right,180°apart),"8"groove on
Material：
Diercet harden steel：GCr15(52100) 42CrMo(4140) 45(1045)
Carburizing steel：20Cr(5120) 20CrMo(4118) 20CrNiMo(8620H)
Copper：ZCuZn24Al6Mn3Fe3 ZCuAl9Fe4Ni4Mn2
Spring steel：65Mn 50CrVA 60Si2MnA
