1, with set screw outer spherical UC type bearings; 2, with tapered bore spherical UK class bearings; with spherical bearings are divided into bearing heart and bearing seat, in the name on the bearing center with the bearing seat, Such as with set screw spherical bearings UC205 with vertical seat UCP205. With seat spherical bearings due to the strong interchangeability, the bearing core can be freely assembled in the same size and shape of the bearing.