30211 bearing
55 × 100 mm · dynamic rating 111 kN · static rating 106 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
30211 specification
| Designation | 30211 |
| Type | Tapered roller bearing |
| Series | 302 standard-angle |
| Bore diameter d | 55 mm |
| Outside diameter D | 100 mm |
| Basic dynamic load rating C | 111 kN (111,000 N) |
| Basic static load rating C0 | 106 kN (106,000 N) |
| Ratio C0/C | 0.95 |
| Speed guide, grease lubrication | 6,700 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 30211 means
| Code | Meaning |
|---|---|
| 302 | Tapered roller bearing, standard contact angle series |
| 11 | bore code "11" = 11 × 5 = 55 mm |
Basic rating life of the 30211
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 30211 with C = 111 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 22.2 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 30211
Brand-by-brand equivalents for this exact designation are not yet in the Rotec AI cross-reference tables. The Cross-Reference tool accepts SKF, FAG, NSK, NTN, Timken, Koyo and NRB designations, and shows what is catalogued.
Where the 30211 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 30211 is size 10 of 28 in the Rotec AI catalogue for the “302 standard-angle” series. The next size down, the 30210, has a bore of 50 mm and a dynamic rating of 93.1 kN. The next size up, the 30212, has a bore of 60 mm and a rating of 120 kN (+8%).
Common problems on bearings like the 30211
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 30211
What are the dimensions of a 30211 bearing?
The 30211 has a bore of 55 mm and an outside diameter of 100 mm. It is a tapered roller bearing. Series: 302 standard-angle.
What is the load rating of a 30211 bearing?
In the Rotec AI catalogue the 30211 has a basic dynamic load rating C of 111 kN and a basic static load rating C0 of 106 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 30211 bearing?
Brand equivalents for the 30211 are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.