1) High mechanical efficiency 
Ball screw has a traditional sliding screw unmatched for more than 90% efficiency, torque sliding screw needed only 1/3 or less. Therefore, the linear motion is converted to rotary motion (reverse operation) is easy. 
2) Adjustable axial clearance 
If the conventional axial sliding of the small gap adjusting screw, the rotation becomes difficult; ball screw and an axial gap is small even if the tone, smooth rotation can be realized. Moreover, by applying a preload to the ball screw may be an axial gap adjustment 
0, while increasing the rigidity of the screw. 
3) Long life 
Using a rolling contact with, even if long-term use will not wear, can maintain accuracy.