Linear cross bearings provide more precise motion control, higher loads and greater stiffness than spherical bearings. Microprocessor based manufacturing, diagnostic equipment and automatic control require higher precision motion control. In these applications, linear cross bearings can meet this requirement better than spherical bearings. Among them, cross roller bearings or sliding bearings are increasingly used in chip manufacturing, robotics, visual inspection and high-tech microscopy and other fields. In these crossed roller bearings, the cylindrical bearing is 90. Crisscross crisscross motion between two parallel axes.