NU 230 ECM bearing
150 × 270 mm · dynamic rating 510 kN · static rating 600 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NU 230 ECM specification
| Designation | NU 230 ECM |
| Type | Cylindrical roller bearing |
| Series | NU2 light |
| Bore diameter d | 150 mm |
| Outside diameter D | 270 mm |
| Basic dynamic load rating C | 510 kN (510,000 N) |
| Basic static load rating C0 | 600 kN (600,000 N) |
| Ratio C0/C | 1.18 |
| Speed guide, grease lubrication | 2,800 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 NU 230 ECM means
| Code | Meaning |
|---|---|
| NU | No flange on the inner ring, two flanges on the outer ring — inner ring can float axially |
| 230 | light dimension series — bore code "30" = 30 × 5 = 150 mm |
| EC | Optimized internal design with more and/or larger rollers |
Basic rating life of the NU 230 ECM
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 NU 230 ECM with C = 510 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 102 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NU 230 ECM
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 NU 230 ECM is used
Cylindrical roller bearings are chosen for: High radial load and high speed; separable arrangements. Typical equipment: Gearboxes, traction motors, rolling mills, generators. Some variants carry axial load; common in railway drive systems.
Other sizes in the same series
The NU 230 ECM belongs to the “NU2 light” series. The next size down, the NU 228 ECM, has a bore of 140 mm and a dynamic rating of 450 kN. The next size up, the NU 232 ECM, has a bore of 160 mm and a rating of 585 kN (+15%).
Common problems on bearings like the NU 230 ECM
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 NU 230 ECM
What are the dimensions of a NU 230 ECM bearing?
The NU 230 ECM has a bore of 150 mm and an outside diameter of 270 mm. It is a cylindrical roller bearing. Series: NU2 light.
What is the load rating of a NU 230 ECM bearing?
In the Rotec AI catalogue the NU 230 ECM has a basic dynamic load rating C of 510 kN and a basic static load rating C0 of 600 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NU 230 ECM bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the NU 230 ECM.