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.