UC300 Series Inch Bore Bearing Insert are a variation of our standard Radial Ball Bearings which have been modified to fit easily into various types of Mounted Unit Housings and Pillow Blocks. VNC Insert Bearings are supplied with the complete housing however replacement bearings can be purchased separately. Internal construction of single row deep groove bearings in mounted units. The ball bearings used in mounted units are quite similar to the 6200 and 6300 series of single row deep groove radial ball bearings. These bearings are designed to operate under radial and to a lesser degree thrust loads and combined loads. They have considerably greater load carrying capacity than double row self aligning bearings used in some other types of mounted units.UC300 Series Inch Bore Bearing Insert ball bearing units consist of a double sealed single row deep groove ball bearing and any one of many types of housings.The outer ring of the self-contained ball bearing is ground to a sphere along with the matching bore of the corresponding housing to provide self alignment capabilities. Cylindrical outer ring ball bearings are also available