Axially symmetric races to support radial loads while maintaining high speeds and rotational accuracy Tapered bore compensates for flexing shafts and fits to tapered shafts C3 radial internal clearance for radial slack between the inner and outer rings is greater than CN (normal) to compensate for thermal expansion Steel cage evenly spaces the rollers for even load distribution and prevents contact to reduce friction, vibrations, and noise Three lubrication holes in the outer ring for lubrication in place