22318 E bearing
90 × 190 mm · dynamic rating 637 kN · static rating 695 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
22318 E specification
| Designation | 22318 E |
| Type | Spherical roller bearing |
| Series | 223 medium |
| Bore diameter d | 90 mm |
| Outside diameter D | 190 mm |
| Basic dynamic load rating C | 637 kN (637,000 N) |
| Basic static load rating C0 | 695 kN (695,000 N) |
| Ratio C0/C | 1.09 |
| Speed guide, grease lubrication | 3,600 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 22318 E means
| Code | Meaning |
|---|---|
| 223 | Spherical roller bearing, double row self-aligning, medium series (higher capacity) |
| 18 | bore code "18" = 18 × 5 = 90 mm |
| E | Optimized internal design |
Basic rating life of the 22318 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 22318 E with C = 637 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 127.4 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 22318 E from other brands
These parts share the main boundary dimensions of the 22318 E and are commonly used as its equivalent. Published load ratings differ a little between makers because internal designs differ.
| Brand | Part | C (kN) | C0 (kN) | Dynamic rating vs SKF |
|---|---|---|---|---|
| SKF | 22318 E | 637 | 695 | Reference |
| FAG | 22318-E1A-XL-MA-T41A | 610 | 630 | 96% of SKF |
Check clearance class, cage, seals and any special suffix before ordering. A matching main size does not guarantee the parts are interchangeable in every detail.
Where the 22318 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 22318 E is size 11 of 23 in the Rotec AI catalogue for the “223 medium” series. The next size down, the 22317 E, has a bore of 85 mm and a dynamic rating of 577 kN. The next size up, the 22319 E, has a bore of 95 mm and a rating of 699 kN (+10%).
Common problems on bearings like the 22318 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 22318 E
What are the dimensions of a 22318 E bearing?
The 22318 E has a bore of 90 mm and an outside diameter of 190 mm. It is a spherical roller bearing. Series: 223 medium.
What is the load rating of a 22318 E bearing?
In the Rotec AI catalogue the 22318 E has a basic dynamic load rating C of 637 kN and a basic static load rating C0 of 695 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 22318 E bearing?
Equivalent parts include FAG 22318-E1A-XL-MA-T41A. Check clearance, cage and seal suffixes before substituting.