Insert ball bearing units is composed of outer spherical ball bearing and pillow block. In application, it doesn't need bearing housing. Dimension is small and structure is simple, which is easy for use. The insert ball bearing units is solid type, which is rigid and can change with other types. They are able to compensate for initial errors of alignment. Besides, they are sealed at both sides, which can be used in agricultural machinery, construction equipment, conveyor systems, textile machines and fans as well as in machines for food and beverage processing and packaging.