1 Rolling Element Bearings Figure 11-1, Mechanical Engineering Design , Juvinall & Marshek Bearing Terminology ? Tapered Bore: Seat the bearing onto a tapered shaft or to accommodate a tapered sleeve which can be used to fix a bearing to a shaft. ? Shields or Seals: Between the inner and outer rings to capture lubricating grease around the balls and prevent intrusion of contaminants.( Z-shield