The spherical ball bearings is being processing to become the spherical shape by outer raceway,there are double-row ball bearings with two deep groove raceway in the inner ring,which has the ability of aligning function.This type of bearings can mainly carry radial load,meanwhile they can carry little axial load.But normly,they can't carry the pure axial load,the limited rotate speed is more slowly that deep groove ball bearingsThis type of bearings are mainly used in the willowy double bearing shaft in the influence of load,as well as the double bearing bore can't strictly promise the same bearing parts,the rake of central line of inner ring compared with the central line of outer ring can't be more than 3 degrees .