are a common type of
rolling-element bearing, a kind of
bearing. The term ball bearing sometimes means a bearing
assembly which uses spherical bearings as the rolling elements. It also
means an individual ball for a bearing assembly. The remainder of this entry
uses the term ball
for the individual component and ball bearing or just "bearing" for
the assembly.
Ball bearings typically support both axial and radial
loads and can tolerate some misalignment of the inner and outer races.
Ball bearings tend to have lower load capacity for their size than other
kinds of rolling-element bearings due to the smaller contact area that
spherical shapes provide.