Self-Aligning Ball Bearing has two rows of balls and a common concave sphered raceway in the outer ring. The bearing is consequently self-aligning and insensitive to angular misalignmengts of the shaft relative to the housing. It is particular suitable for applications where considerable shaft deflections or misalignment are to be expected.additionally,the self-aligning ball bearing has the lowest friction of all rolling bearings,which enables it to run cooler even at high speeds.