How to Find an Equivalent Bearing Number Across Brands
The base number sets the size, the suffix sets the features. How to match SKF, NTN, FAG, NSK and INA numbers, with insert bearing examples.
Every bearing brand has its own part numbers, so the number on a worn bearing is often not the one on the shelf. The good news is that the size is standard. This guide shows how to find an equivalent bearing and what to double-check before ordering.
1. The base number sets the size
Under the ISO boundary dimension standard, the same base number from different brands has the same bore, outside diameter and width. A 6205 from any maker fits the same space. The part that differs is the suffix.
2. Suffixes are not standard
Seals, shields, clearance and cage are coded differently by each brand. For example a bearing with two contact rubber seals is 2RS1 at SKF, DDU at NSK, LLB at NTN and 2RSR at FAG. Match the feature, not the letters.
3. Insert bearings have their own names
Mounted insert bearings are sold under different series names. In the metric 2-series, an AEL205 eccentric collar insert is also listed as SA205, an AELS205 as CSA205 and a UEL205 as HC205 or NA205. INA lists them as GRAE25-XL-NPP-B, RAE25-XL-NPP and GE25-XL-KRR-B. The shaft size is the same, so check the locking type and seals.
4. Spherical roller bearings need the suffix too
A 22210 with a pressed steel cage and C3 clearance is 22210EAW33C3 at NTN and 22210E/C3 at SKF. Brass cage versions use different suffixes again. Send the full number with its suffix.
5. Confirm before you order
Use an interchange chart to find candidates, then confirm the exact version with your supplier. If you only have the old bearing, send a photo of every marking on both rings.
- Base number and series
- Full suffix
- Shaft size and housing
- Brand or equivalent grade
- Quantity
Key Takeaways
- The base number fixes the size, the suffix fixes the features
- Match seals, clearance and locking, not the letters
- Use a chart for candidates and confirm before ordering
This article is general guidance. For a recommendation for your own application, contact our engineering team. Bearing interchange chart →