Spherical roller bearings have double-row rollers, the outer ring has a common spherical raceway, the inner ring has two raceways, and is inclined at an angle relative to the bearing axis. This ingenious structure makes it have self-aligning performance, so it is not easily affected by the angle of the shaft and the bearing box seat to the error or the bending of the shaft. In addition to bearing radial loads, this bearing can also support axial loads in both directions.

Spherical roller bearings have cylindrical and conical internal bores, and tapered cone bores have a taper of 1:30 and 1:12. This tapered inner bore bearing is equipped with an adapter sleeve or a withdrawal sleeve The conical inner hole self-aligning ball bearing can be easily and quickly assembled on the optical axis or the stepper shaft.