RNA 4822 bearing
120 × 140 mm · dynamic rating 93.5 kN · static rating 232 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
RNA 4822 specification
| Designation | RNA 4822 |
| Type | Needle roller bearing |
| Series | — |
| Bore diameter d | 120 mm |
| Outside diameter D | 140 mm |
| Basic dynamic load rating C | 93.5 kN (93,500 N) |
| Basic static load rating C0 | 232 kN (232,000 N) |
| Ratio C0/C | 2.48 |
| 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 RNA 4822 means
| Code | Meaning |
|---|---|
| NK | Needle roller bearing, machined ring with flange, no inner ring — the hardened/ground shaft itself serves as the inner raceway |
Basic rating life of the RNA 4822
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 RNA 4822 with C = 93.5 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 18.7 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the RNA 4822
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 RNA 4822 is used
Needle roller bearings are chosen for: High radial load in limited radial space. Typical equipment: Transmissions, actuators, mobile equipment, compact machinery. Requires hardened raceways or inner ring; alignment sensitivity.
Other sizes in the same series
The RNA 4822 belongs to the “” series. The next size down, the NK 110/40, has a bore of 110 mm and a dynamic rating of 123 kN. The next size up, the RNA 4824, has a bore of 130 mm and a rating of 99 kN (+6%).
Common problems on bearings like the RNA 4822
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 RNA 4822
What are the dimensions of a RNA 4822 bearing?
The RNA 4822 has a bore of 120 mm and an outside diameter of 140 mm. It is a needle roller bearing.
What is the load rating of a RNA 4822 bearing?
In the Rotec AI catalogue the RNA 4822 has a basic dynamic load rating C of 93.5 kN and a basic static load rating C0 of 232 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a RNA 4822 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the RNA 4822.