A ball screw is a transmission device used in CNC machine tools and other precision equipment. Ball screws use the principle of cooperation between balls and screw threads to transmit force and motion. The ball thread nut is equipped with balls inside, and the balls roll between the ball thread and the screw thread, thereby reducing sliding friction and improving transmission efficiency and accuracy. Compared with traditional threaded screw transmission, ball screws have the following advantages: 1. High efficiency: Since the balls roll instead of slide, the friction loss is small and the transmission efficiency is high. 2. High precision: The ball thread and screw thread of the ball screw have high precision, small transmission error, and can achieve high positioning accuracy. 3. High stiffness: Due to the small contact area of the balls, the ball screw has high stiffness and can withstand larger loads. 4. High-speed movement: Ball screws can achieve higher speeds due to their small friction. Therefore, ball screws are widely used in CNC machine tools, automation equipment, robots and other fields in applications that require high precision, high stiffness and high-speed motion.