Bearing number confusion leads to wrong replacements and costly downtime. Over 40% of bearing failures start with incorrect identification.

Tapered roller bearing numbers follow standardized codes where the last two digits ×5 equals the bore diameter in mm. Prefixes indicate series while suffixes show special features like seals or clearances.

Let me break down how to read these critical codes so you can always identify bearings correctly.

How do I find my taper roller bearing number?

Bearing numbers hide in plain sight. Knowing where to look prevents installation mistakes and ordering errors.

Locate tapered roller bearing numbers¹ on the cone’s large end or cup’s outer diameter. Clean the surface thoroughly as markings may be faint or obscured by grease.

Comprehensive Identification Guide

1. Common Marking Locations

2. Number Format Examples

3. When Numbers Are Missing

   • Measure bore, OD, and width
   • Count roller quantity
   • Note contact angle

4. Professional Identification Tools

   • Bearing cross-reference books
   • Digital calipers
   • Manufacturer catalogs

How do you read wheel bearing numbers¹?

Wheel bearing codes follow similar patterns but have unique identifiers. Misreading causes safety risks.

Wheel bearing numbers combine standard bearing codes with vehicle-specific prefixes. The last digits still indicate bore size while middle numbers show design variations.

Wheel Bearing Number Breakdown

1. Standard vs Wheel Bearing Codes

2. Common Wheel Bearing Prefixes

3. Special Wheel Bearing Features

4. Decoding Example: BR930456A
   • BR = Timken wheel bearing
   • 930 = Design series
   • 45 = Bore diameter code
   • 6 = Version
   • A = ABS compatible

Conclusion

Mastering bearing number interpretation ensures correct replacements and prevents equipment failures. Always verify numbers before ordering.