The spiral is usually a cylinder or a round hole with uneven helical stripes on the surface. The cylinder is called a screw, the round hole is a nut, and the helical stripes are a thread.

Ball screws are high-efficiency feed screws that contain balls that rotate between the screw and nut. Compared with the traditional slide screw, the driving torque is less than one-third, which is most suitable for saving the power of the driving motor.

Most of the transmission components used in the feed system used in precision machinery today use ball screws and linear slide rails, which can bring excellent feed positioning accuracy to the linear transmission. In fact, "transmission components" are not only "ball screws" or "linear slides", but the real "transmission components", because they are not only related to manufacturing, but also appear in life all the time.

A ball screw is a kind of transmission mechanical component in which a steel ball moves between screw and nut to convert the sliding contact of the traditional screw into rolling contact.