The stepper screw motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. The base size is 20mm, 28mm, 35mm, 42mm, 57mm, 60mm, and 86mm. The screw length and end processing can be customized as required. Nuts and shapes of different materials can be customized as required. Common ones are externally driven ball screw motors and through-type trapezoidal screw motors.