A separate and distinct component of the ball bearing mounted unit is the insert bearing. This component is a standard 6200 or 6300 series radial ball bearing which has been adapted to fit into the housing. Although it is generally sold assembled within the housing, it may also be purchased as a stand-alone item as a replacement bearing for an bearing unit. It may also be inserted into a customer-supplied housing or into a housing that is an integral component of the application equipment.