30205 bearing
25 × 52 mm · dynamic rating 38.1 kN · static rating 33.5 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
30205 specification
| Designation | 30205 |
| Type | Tapered roller bearing |
| Series | 302 standard-angle |
| Bore diameter d | 25 mm |
| Outside diameter D | 52 mm |
| Basic dynamic load rating C | 38.1 kN (38,100 N) |
| Basic static load rating C0 | 33.5 kN (33,500 N) |
| Ratio C0/C | 0.88 |
| Speed guide, grease lubrication | 13,000 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 30205 means
| Code | Meaning |
|---|---|
| 302 | Tapered roller bearing, standard contact angle series |
| 05 | bore code "05" = 5 × 5 = 25 mm |
Basic rating life of the 30205
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 30205 with C = 38.1 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 7.62 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 30205
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 30205 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 30205 is size 4 of 28 in the Rotec AI catalogue for the “302 standard-angle” series. The next size down, the 30204, has a bore of 20 mm and a dynamic rating of 34.1 kN. The next size up, the 30206, has a bore of 30 mm and a rating of 50 kN (+31%).
Common problems on bearings like the 30205
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 30205
What are the dimensions of a 30205 bearing?
The 30205 has a bore of 25 mm and an outside diameter of 52 mm. It is a tapered roller bearing. Series: 302 standard-angle.
What is the load rating of a 30205 bearing?
In the Rotec AI catalogue the 30205 has a basic dynamic load rating C of 38.1 kN and a basic static load rating C0 of 33.5 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 30205 bearing?
Brand equivalents for the 30205 are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.