... , trapezoidal screws, high-speed screw, long screw, micro screw shape, spline shaft, worm gear, electric windows screw, light bars(1) achieved the ... roughness in the following 0.8S Rolling the ball screw shaft surface in turn made precise later, after a special ... and can be smooth motion performance. Trapezoidal screw,Ball screw shaft ,lead screw. We produce them. High precision stainless steel ...