NSK spherical bearing is actually a variant of deep groove ball bearing, which is characterized by the spherical surface of its outer ring. It can be fitted into the corresponding concave spherical surface of the bearing seat to play the role of centering. Although its basic performance should be similar to that of the deep groove ball bearing, since most of the bearings are used in rough machinery, the installation and positioning are not accurate enough. When the axis of the shaft and the hole is neutral difference, or if the shaft is long and the deflection is large, the bearing itself precision is not high enough, and some of the structures are rough. Therefore, the performance of the actual performance of the same specifications of deep groove ball bearings to a considerable discount.