... SFU, SFT, SFE, DFU, DFI etc.Size of screw shaft: 1204, 1205,1605, 1610, 1616, 2005, 2010, 2040 ... light preloading and eliminates backlashShaft precision degree: Shaft Dia/Accuracy C7C101404 1405 1605 1610 2005 25050 ... to linear motion with little friction. A threaded shaft provides a helical raceway for ball bearings which ... acts as the nut while the threaded shaft is the screw. Precision Ball Screw