50MM SFU5010 Steel Ball Screw 1,Ball screw OEM service. 2,SFU5010 ball screw 3,Ball screw Made in China Ball screws are used in aircraft and missiles to move control surfaces, especially for electric fly by wire. They are also used in machine tools, robots and precision assembly equipment. High precision ball screws are used in steppers for semiconductor manufacturing. In contrast to conventional leadscrews, ballscrews tend to be rather bulky,