夜夜爱夜夜做夜夜爽丨а√资源新版在线天堂丨国产超碰人人做人人爱ⅴa丨欧美群交射精内射颜射潮喷丨精品国产天堂综合一区在线

軸套材料：

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

滲碳鋼(Carburizing steel): 20Cr ( 5120 )??20CrMo(4118)??20CrNiMo(8620H)

銅(Copper):ZCuZn24AI6Mn3Fe3??ZCuAI9Fe4Ni4Mn2

彈簧鋼(Spring steel):65Mn??50CrVA??60Si2MnA

產(chǎn)品特點：內(nèi)孔有徑向潤滑槽