NK 100/36 bearing
100 × 120 mm · dynamic rating 108 kN · static rating 250 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
NK 100/36 specification
| Designation | NK 100/36 |
| Type | Needle roller bearing |
| Series | — |
| Bore diameter d | 100 mm |
| Outside diameter D | 120 mm |
| Basic dynamic load rating C | 108 kN (108,000 N) |
| Basic static load rating C0 | 250 kN (250,000 N) |
| Ratio C0/C | 2.31 |
| Speed guide, grease lubrication | 4,500 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 NK 100/36 means
| Code | Meaning |
|---|---|
| NK | Needle roller bearing, machined ring with flange, no inner ring — the hardened/ground shaft itself serves as the inner raceway |
| 100 | Bore (Fw) = 100 mm — stated directly, not a bore code |
| 36 | Bearing width = 36 mm — stated directly |
Basic rating life of the NK 100/36
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 NK 100/36 with C = 108 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 21.6 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the NK 100/36
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 NK 100/36 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 NK 100/36 belongs to the “” series. The next size down, the NK 95/36, has a bore of 95 mm and a dynamic rating of 105 kN. The next size up, the NK 110/40, has a bore of 110 mm and a rating of 123 kN (+14%).
Common problems on bearings like the NK 100/36
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 NK 100/36
What are the dimensions of a NK 100/36 bearing?
The NK 100/36 has a bore of 100 mm and an outside diameter of 120 mm. It is a needle roller bearing.
What is the load rating of a NK 100/36 bearing?
In the Rotec AI catalogue the NK 100/36 has a basic dynamic load rating C of 108 kN and a basic static load rating C0 of 250 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a NK 100/36 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the NK 100/36.