NU 234 ECML bearing
170 × 310 mm · dynamic rating 695 kN · static rating 815 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NU 234 ECML specification
| Designation | NU 234 ECML |
| Type | Cylindrical roller bearing |
| Series | NU2 light |
| Bore diameter d | 170 mm |
| Outside diameter D | 310 mm |
| Basic dynamic load rating C | 695 kN (695,000 N) |
| Basic static load rating C0 | 815 kN (815,000 N) |
| Ratio C0/C | 1.17 |
| Speed guide, grease lubrication | 3,800 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 234 ECML means
| Code | Meaning |
|---|---|
| NU | No flange on the inner ring, two flanges on the outer ring — inner ring can float axially |
| 234 | light dimension series — bore code "34" = 34 × 5 = 170 mm |
| EC | Optimized internal design with more and/or larger rollers |
Basic rating life of the NU 234 ECML
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 234 ECML with C = 695 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 139 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NU 234 ECML
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 234 ECML 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 234 ECML belongs to the “NU2 light” series. The next size down, the NU 232 ECM, has a bore of 160 mm and a dynamic rating of 585 kN. The next size up, the NU 236 ECML, has a bore of 180 mm and a rating of 720 kN (+4%).
Common problems on bearings like the NU 234 ECML
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 234 ECML
What are the dimensions of a NU 234 ECML bearing?
The NU 234 ECML has a bore of 170 mm and an outside diameter of 310 mm. It is a cylindrical roller bearing. Series: NU2 light.
What is the load rating of a NU 234 ECML bearing?
In the Rotec AI catalogue the NU 234 ECML has a basic dynamic load rating C of 695 kN and a basic static load rating C0 of 815 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NU 234 ECML bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the NU 234 ECML.