30228 bearing
140 × 250 mm · dynamic rating 451 kN · static rating 570 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
30228 specification
| Designation | 30228 |
| Type | Tapered roller bearing |
| Series | 302 standard-angle |
| Bore diameter d | 140 mm |
| Outside diameter D | 250 mm |
| Basic dynamic load rating C | 451 kN (451,000 N) |
| Basic static load rating C0 | 570 kN (570,000 N) |
| Ratio C0/C | 1.26 |
| Speed guide, grease lubrication | 2,600 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 30228 means
| Code | Meaning |
|---|---|
| 302 | Tapered roller bearing, standard contact angle series |
| 28 | bore code "28" = 28 × 5 = 140 mm |
Basic rating life of the 30228
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 30228 with C = 451 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 90.2 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 30228
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 30228 is used
Tapered roller bearings are chosen for: Combined radial and axial load; stiffness. Typical equipment: Wheel hubs, gearboxes, rail wheelsets, construction/agri equipment. Usually adjusted/preloaded; paired arrangements common.
Other sizes in the same series
The 30228 belongs to the “302 standard-angle” series. The next size down, the 30226, has a bore of 130 mm and a dynamic rating of 451 kN. The next size up, the 30232, has a bore of 160 mm and a rating of 566 kN (+25%).
Common problems on bearings like the 30228
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 30228
What are the dimensions of a 30228 bearing?
The 30228 has a bore of 140 mm and an outside diameter of 250 mm. It is a tapered roller bearing. Series: 302 standard-angle.
What is the load rating of a 30228 bearing?
In the Rotec AI catalogue the 30228 has a basic dynamic load rating C of 451 kN and a basic static load rating C0 of 570 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 30228 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 30228.