51226 bearing
130 × 190 mm · dynamic rating 186 kN · static rating 585 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
51226 specification
| Designation | 51226 |
| Type | Single-direction thrust ball bearing |
| Series | 512 light-medium |
| Bore diameter d | 130 mm |
| Outside diameter D | 190 mm |
| Basic dynamic load rating C | 186 kN (186,000 N) |
| Basic static load rating C0 | 585 kN (585,000 N) |
| Ratio C0/C | 3.15 |
| Speed guide, grease lubrication | 2,000 rpm |
| Life exponent p | 3 (ball 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 51226 means
| Code | Meaning |
|---|---|
| 512 | Single-direction thrust ball bearing, light-medium series (flat seat washers) |
| 26 | bore code "26" = 26 × 5 = 130 mm |
Basic rating life of the 51226
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 51226 with C = 186 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% | 27 | 300 | 150 |
| 5 | 20.0% | 125 | 1,400 | 690 |
| 8 | 12.5% | 512 | 5,700 | 2,800 |
| 12 | 8.3% | 1,728 | 19,200 | 9,600 |
For example, a C / P of 5 means the equivalent load is 37.2 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 51226
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 51226 is used
Thrust ball / thrust roller bearings are chosen for: Predominantly axial load. Typical equipment: Vertical pumps, extruders, turbines, marine and heavy gear drives. Thrust roller for higher axial capacity and shock.
Other sizes in the same series
The 51226 is size 21 of 28 in the Rotec AI catalogue for the “512 light-medium” series. The next size down, the 51224, has a bore of 120 mm and a dynamic rating of 127 kN. The next size up, the 51228, has a bore of 140 mm and a rating of 190 kN (+2%).
Common problems on bearings like the 51226
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 51226
What are the dimensions of a 51226 bearing?
The 51226 has a bore of 130 mm and an outside diameter of 190 mm. It is a single-direction thrust ball bearing. Series: 512 light-medium.
What is the load rating of a 51226 bearing?
In the Rotec AI catalogue the 51226 has a basic dynamic load rating C of 186 kN and a basic static load rating C0 of 585 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 51226 bearing?
Brand equivalents for the 51226 are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.