NU 236 ECML bearing
180 × 320 mm · dynamic rating 720 kN · static rating 850 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NU 236 ECML specification
| Designation | NU 236 ECML |
| Type | Cylindrical roller bearing |
| Series | NU2 light |
| Bore diameter d | 180 mm |
| Outside diameter D | 320 mm |
| Basic dynamic load rating C | 720 kN (720,000 N) |
| Basic static load rating C0 | 850 kN (850,000 N) |
| Ratio C0/C | 1.18 |
| Speed guide, grease lubrication | 3,600 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 236 ECML means
| Code | Meaning |
|---|---|
| NU | No flange on the inner ring, two flanges on the outer ring — inner ring can float axially |
| 236 | light dimension series — bore code "36" = 36 × 5 = 180 mm |
| EC | Optimized internal design with more and/or larger rollers |
Basic rating life of the NU 236 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 236 ECML with C = 720 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 144 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NU 236 ECML from other brands
These parts share the main boundary dimensions of the NU 236 ECML and are commonly used as its equivalent. Published load ratings differ a little between makers because internal designs differ.
| Brand | Part | C (kN) | C0 (kN) | Dynamic rating vs SKF |
|---|---|---|---|---|
| SKF | NU 236 ECML | 720 | 850 | Reference |
| FAG | NU236-E-XL-M1-C3 | — | — | — |
Check clearance class, cage, seals and any special suffix before ordering. A matching main size does not guarantee the parts are interchangeable in every detail.
Where the NU 236 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 236 ECML belongs to the “NU2 light” series. The next size down, the NU 234 ECML, has a bore of 170 mm and a dynamic rating of 695 kN. The next size up, the NU 238 ECML, has a bore of 190 mm and a rating of 800 kN (+11%).
Common problems on bearings like the NU 236 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 236 ECML
What are the dimensions of a NU 236 ECML bearing?
The NU 236 ECML has a bore of 180 mm and an outside diameter of 320 mm. It is a cylindrical roller bearing. Series: NU2 light.
What is the load rating of a NU 236 ECML bearing?
In the Rotec AI catalogue the NU 236 ECML has a basic dynamic load rating C of 720 kN and a basic static load rating C0 of 850 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NU 236 ECML bearing?
Equivalent parts include FAG NU236-E-XL-M1-C3. Check clearance, cage and seal suffixes before substituting.