Ubc bearing 6300 series deep groove roller bearings ubc 6309 2rs 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 seals on both sides are made of rubber encased sheet steel and closed with a sealing lip on the inner ring and offer a high