Choosing the right bearing starts with accurate dimensions, load type and operating conditions. The outside diameter alone is not enough: width, internal clearance, sealing and accuracy also matter.
A bearing designation usually links its dimensional series with its design. When replacing an old part, record the complete code from the ring first and then confirm it with measured dimensions.
What to Focus On
- shaft and bore diameter
- housing bore diameter
- bearing width and available space
- radial and axial load
- speed, temperature, moisture and contamination
Recommended Procedure
- Clean the old bearing and record its full designation.
- Measure bore, outside diameter and width with a suitable gauge.
- Define the required seals, clearance and accuracy.
- Compare catalogue dimensions and limiting speeds before ordering.
Common Mistake
The most common mistake is ordering from three dimensions only. Bearings of the same size can have different clearance, load capacity or cage design.
Summary
Combining the full designation, accurate measurements and real operating conditions produces a safer replacement and a longer machine service life.