Look for specialized heat-resistant materials and lubricants. 2. Measure or Decode Existing Bearings
If replacing an existing part, use the identification code typically stamped on the ring.
Buying ball bearings online requires matching your specific technical needs—like load type, speed, and environment—to standardized bearing codes and measurements. 1. Identify Your Technical Specifications
The bore size (Inner Diameter). For digits above 03, multiply by 5 to get the size in mm (e.g., "05" = 25mm).
Forces acting perpendicular to the shaft (e.g., wheels, pulleys). Deep groove ball bearings are standard for light to medium radial loads.
If the code is unreadable, use a vernier caliper to measure the Inner Diameter (ID) , Outer Diameter (OD) , and Width (W) in millimeters. 3. Choose Reputable Online Suppliers Bearing Selection Guide | How to Choose a Bearing