The outer ring of the selfcontained ball bearing in ground to a sphere, and the bore of
housing in machined to a matching radius, This permits self-aligning between the two
members. Which is the most popular type of Insert Ball Bearing Units with set screw
locking. The bearing units have various types of perfect sealing devices and can operate
satisfactorily under hard working conditions, especially for machines operated in industry
or muddy surroundings.