If replacing an existing part, use the identification code typically stamped on the ring.
High-speed applications (e.g., fans, motors) require precision or ceramic hybrid bearings to handle heat. Operating Environment:
Forces acting parallel to the shaft. Choose thrust ball bearings for exclusively axial forces.
"ZZ" means two metal shields; "2RS" means two rubber seals.
Bearing type (e.g., "6" is a deep groove ball bearing).
Robustness/series (e.g., extra light, light, or medium).
Forces acting perpendicular to the shaft (e.g., wheels, pulleys). Deep groove ball bearings are standard for light to medium radial loads.
Look for specialized heat-resistant materials and lubricants. 2. Measure or Decode Existing Bearings