The development of modern industrial robots tends to be lightweight, bearings to be installed in a limited space, must be small in size and light in weight. Thin-wall bearings are widely used in robots, and industrial robot bearings, as one of the key components of industrial robots, are suitable for joint parts or rotating parts of industrial robots, robot rotation parts, etc. The use of thin wall bearings with equal section can save space, reduce weight, significantly reduce friction, and provide good rotation accuracy. It makes the light and miniaturization of the host possible.