They are available open or sealed. The bearings are insensitive to angular misalignment of the shaft Self Aligning Ball Bearings relative to the housing , which can be caused, for example, by shaft deflection.Self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. 

This bearing should only be used in light SKF vkn 600 Bearing axial load applications due to the small axial capacity.