日日日夜夜操-日日爽天天-日日夜人人澡人人澡人人看免-日日夜夜婷婷-亚洲天堂一区二区三区四区-亚洲天堂在线播放

Material composition
The steel-based copper-alloy bearing is produced by compounding the rolled tin bronze and other alloy plates in steel or cast die cavity with special process. It is in possession of the abrasion resistance of copper alloy and high mechanical strength of steel.Compared with traditional copper pieces, it can reduce more than 25% cost. So, it is widely applied in the sliding pairs of various machines and mechanical equipment.
The processing of this series of products is customized as per the drawings.