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A. The Ball Screw Assembly
The ball screw assembly consists of a screw and a nut, each with matching helical grooves, and balls which roll between these grooves between the nut and the screw when the nut or screw is rotating. The balls are deflected by the deflector into the ball return system of the nut and they travel through the return system to the opposite end of the ball nut in a continuous path, and exit from the ball return system into the ball screw and nut thread raceways continuously to recirculate in a closed circuit.
B. The Ball Nut Assembly
The ball nut determines the load and life of the ball screw assembly. The ratio of the number of threads in the ball nut circuit to the number of threads on the ball screw determines how much sooner the ball nut will reach fatigue failure (wear out) than the ball screw will.
 C. Ball Nuts Are Manufactured With Two Types of Return Systems(a)The External Ball Return System
In this type of return system, the ball is returned to the opposite end of the nut through a ball return tube which protrudes above the outside diameter of the ball nut. | 
