22308 E bearing
40 × 90 mm · dynamic rating 155 kN · static rating 140 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
22308 E specification
| Designation | 22308 E |
| Type | Spherical roller bearing |
| Series | 223 medium |
| Bore diameter d | 40 mm |
| Outside diameter D | 90 mm |
| Basic dynamic load rating C | 155 kN (155,000 N) |
| Basic static load rating C0 | 140 kN (140,000 N) |
| Ratio C0/C | 0.90 |
| Speed guide, grease lubrication | 8,000 rpm |
| Life exponent p | 10/3 (roller bearing) |
Values come from the Rotec AI bearing catalogue and are indicative. Confirm against the manufacturer's current catalogue before ordering. Not every dimension (such as width) is listed here.
What the designation 22308 E means
| Code | Meaning |
|---|---|
| 223 | Spherical roller bearing, double row self-aligning, medium series (higher capacity) |
| 08 | bore code "08" = 8 × 5 = 40 mm |
| E | Optimized internal design |
Basic rating life of the 22308 E
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 10/3 (roller bearing). For a 22308 E with C = 155 kN, the table shows what that gives at different load levels. It is the ISO 281 basic life only: it does not include lubrication, contamination, misalignment or reliability modifiers.
| C / P | P as share of C | L10 (million rev) | L10 at 1,500 rpm | L10 at 3,000 rpm |
|---|---|---|---|---|
| 3 | 33.3% | 39 | 430 | 220 |
| 5 | 20.0% | 214 | 2,400 | 1,200 |
| 8 | 12.5% | 1,024 | 11,400 | 5,700 |
| 12 | 8.3% | 3,956 | 44,000 | 22,000 |
For example, a C / P of 5 means the equivalent load is 31 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 22308 E
Brand-by-brand equivalents for this exact designation are not shown here. The Cross-Reference tool accepts SKF, FAG, NSK, NTN, Timken, Koyo and NRB designations, and shows what is catalogued.
Where the 22308 E is used
Spherical roller bearings are chosen for: Very high radial load with misalignment capability. Typical equipment: Crushers, mills, conveyors, wind main shafts, paper machines. Robust for shock/dust; lubrication and sealing are crucial.
Other sizes in the same series
The 22308 E belongs to the “223 medium” series. The next size up, the 22309 E, has a bore of 45 mm and a rating of 190 kN (+23%).
Common problems on bearings like the 22308 E
Most field failures trace back to lubrication, contamination, fits and alignment rather than the bearing itself. These guides explain how to recognise and prevent them:
Questions about the 22308 E
What are the dimensions of a 22308 E bearing?
The 22308 E has a bore of 40 mm and an outside diameter of 90 mm. It is a spherical roller bearing. Series: 223 medium.
What is the load rating of a 22308 E bearing?
In the Rotec AI catalogue the 22308 E has a basic dynamic load rating C of 155 kN and a basic static load rating C0 of 140 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 22308 E bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 22308 E.