... Transmission Efficiency; D:Long Durability. 1. Low Backlash;2. Anti-friction,dustproof;3. All kinds of item, by customers requirements;4 ... , DFU,SFE,DFE,SFT, DFT,SFI,DFI,DFS,SFK,DFK,Inner loop,output loop,great load and great lead series ball ... move into a rolling bearing from sliding action. With little friction, ball screws are widely used in various industrial equipment and ...