... trapezoidal screws, high-speed screw, long screw, micro screw shape, spline shaft, worm gear, electric windows screw, light bars(1) achieved ... and precision grinding through the spiral groove ball screw, like a ball rolling surface, the surface roughness ... can be smooth motion performance. Trapezoidal screw,Ball screw shaft ,lead screw. We produce them. High precision stainless steel Trapezoidal screw