NU 238 ECML bearing
190 × 340 mm · dynamic rating 800 kN · static rating 965 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NU 238 ECML specification
| Designation | NU 238 ECML |
| Type | Cylindrical roller bearing |
| Series | NU2 light |
| Bore diameter d | 190 mm |
| Outside diameter D | 340 mm |
| Basic dynamic load rating C | 800 kN (800,000 N) |
| Basic static load rating C0 | 965 kN (965,000 N) |
| Ratio C0/C | 1.21 |
| Speed guide, grease lubrication | 3,400 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 238 ECML means
| Code | Meaning |
|---|---|
| NU | No flange on the inner ring, two flanges on the outer ring — inner ring can float axially |
| 238 | light dimension series — bore code "38" = 38 × 5 = 190 mm |
| EC | Optimized internal design with more and/or larger rollers |
Basic rating life of the NU 238 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 238 ECML with C = 800 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 160 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NU 238 ECML
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 NU 238 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 238 ECML is size 28 of 29 in the Rotec AI catalogue for the “NU2 light” series. The next size down, the NU 236 ECML, has a bore of 180 mm and a dynamic rating of 720 kN. The next size up, the NU 240 ECML, has a bore of 200 mm and a rating of 880 kN (+10%).
Common problems on bearings like the NU 238 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 238 ECML
What are the dimensions of a NU 238 ECML bearing?
The NU 238 ECML has a bore of 190 mm and an outside diameter of 340 mm. It is a cylindrical roller bearing. Series: NU2 light.
What is the load rating of a NU 238 ECML bearing?
In the Rotec AI catalogue the NU 238 ECML has a basic dynamic load rating C of 800 kN and a basic static load rating C0 of 965 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NU 238 ECML bearing?
Brand equivalents for the NU 238 ECML are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.