The SKF self-aligning ball bearing has two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. The bearing is insensitive to angular misalignment of the shaft relative to the housing, which can be caused, for example, by shaft deflection. It can reduce noise and vibration levels, for example, in fans. Very loose conformity between balls and outer ring keeps friction and frictional heat at low levels.

Excellent high-speed performance
Minimum maintenance
Excellent light load performance