The outer spherical ball bearing is actually a variant of the deep groove ball bearing, characterized by its outer diameter surface being spherical, which can be matched into the corresponding concave spherical surface of the bearing seat for centering. Outer spherical bearings are mainly used to withstand combined radial and axial loads, mainly radial loads, and are generally not suitable for bearing axial loads alone. Although its basic performance should be similar to that of deep groove ball bearings, due to the fact that this type of bearing is mostly used in relatively rough machinery, the installation and positioning are not precise enough, the axis alignment between the shaft and the seat hole is poor, or the shaft is long and has large deflection, and the accuracy of the bearing itself is not high enough, and some structures are also relatively rough. Therefore, the actual performance of deep groove ball bearings with the same specifications should be given a considerable discount.