A ball bearing unite is comprised of a ball bearing inserted into various type of housing. The housing can be bolted onto machinery and the inner ring can be easily mounted on the shaft with set screw. This means the bearing unit can support rotating equipment without special design to allow for mounting. A variety of standardized housing shapes is available, including pillow and flange types. The outer diameter of the bearing is spherical just like the inner diameter of the housing and particle penetration is prevented by a double seal with 3 lips.