A crossed roller FAG bearing is a special type of bearing with a split inner ring and a rotating outer ring. Since the divided inner ring or outer ring is installed with the roller and spacer, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to install the cross roller ring. Since the rollers are arranged in a cross, only one set of Cross Roller Rings can withstand loads in all directions, and the rigidity is 3 to 4 times higher than that of conventional models. At the same time, since the inner ring or outer ring of the crossed roller bearing is divided into two structures, the bearing clearance can be adjusted, and even if a preload is applied, high-precision rotational motion can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.

In a crossed roller bearing, since the cylindrical rollers are arranged perpendicular to each other through spacers, a single crossed roller bearing can withstand loads in all directions, including radial load, axial load, and moment load. The size of the inner and outer rings is minimized, especially the ultra-thin type is a small size close to the limit, and has high rigidity, so it is most suitable for the joint part or rotating part of industrial robots, the rotary table of machining center, It is used for robot rotating parts, precision rotary tables, medical equipment, measuring instruments, IC manufacturing equipment, etc.