Ubc bearing 6300 series deep groove roller bearings ubc 6303 2z deep groove ball bearings from ubc accept radial and axial forces and are suitable for high rotational speeds because of their constructional features deep groove ball bearings are suitable for a wide range of applications they are heat treated so can be used in operating temperatures of up to 150 c shields on both sides protect the inner part of the bearings from the ingress of dirt and other foreign bodies if the oute