Insert adjustment plates between two nuts to apply preload in a staggered manner, reducing the increase in rotational torque and heat generation caused by differential sliding or rotation phenomena; the outer diameter of the nut is about 70%-80% of the recirculating type nut with a curved pipe. This model has a small outer diameter of the nut, allowing for compact design. Additionally, due to its special recirculating structure, it achieves high-speed and quiet transmission.