NU 224 ECP bearing
120 × 215 mm · dynamic rating 390 kN · static rating 430 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NU 224 ECP specification
| Designation | NU 224 ECP |
| Type | Cylindrical roller bearing |
| Series | NU2 light |
| Bore diameter d | 120 mm |
| Outside diameter D | 215 mm |
| Basic dynamic load rating C | 390 kN (390,000 N) |
| Basic static load rating C0 | 430 kN (430,000 N) |
| Ratio C0/C | 1.10 |
| 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 224 ECP means
| Code | Meaning |
|---|---|
| NU | No flange on the inner ring, two flanges on the outer ring — inner ring can float axially |
| 224 | light dimension series — bore code "24" = 24 × 5 = 120 mm |
| EC | Optimized internal design with more and/or larger rollers |
| P | Glass-fibre-reinforced PA66 cage, roller-centred |
Basic rating life of the NU 224 ECP
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 224 ECP with C = 390 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 78 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NU 224 ECP from other brands
These parts share the main boundary dimensions of the NU 224 ECP 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 224 ECP | 390 | 430 | Reference |
| FAG | NU224-E-TVP2 | — | — | — |
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 224 ECP 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 224 ECP belongs to the “NU2 light” series. The next size down, the NU 222 ECP, has a bore of 110 mm and a dynamic rating of 335 kN. The next size up, the NU 226 ECP, has a bore of 130 mm and a rating of 415 kN (+6%).
Common problems on bearings like the NU 224 ECP
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 224 ECP
What are the dimensions of a NU 224 ECP bearing?
The NU 224 ECP has a bore of 120 mm and an outside diameter of 215 mm. It is a cylindrical roller bearing. Series: NU2 light.
What is the load rating of a NU 224 ECP bearing?
In the Rotec AI catalogue the NU 224 ECP has a basic dynamic load rating C of 390 kN and a basic static load rating C0 of 430 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NU 224 ECP bearing?
Equivalent parts include FAG NU224-E-TVP2. Check clearance, cage and seal suffixes before substituting.