51230 M bearing
150 × 215 mm · dynamic rating 238 kN · static rating 800 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
51230 M specification
| Designation | 51230 M |
| Type | Single-direction thrust ball bearing |
| Series | 512 light-medium |
| Bore diameter d | 150 mm |
| Outside diameter D | 215 mm |
| Basic dynamic load rating C | 238 kN (238,000 N) |
| Basic static load rating C0 | 800 kN (800,000 N) |
| Ratio C0/C | 3.36 |
| Speed guide, grease lubrication | 1,800 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 51230 M means
| Code | Meaning |
|---|---|
| 512 | Single-direction thrust ball bearing, light-medium series (flat seat washers) |
| 30 M | bore code "30 M" = 30 × 5 = 150 mm |
Basic rating life of the 51230 M
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 51230 M with C = 238 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 47.6 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 51230 M
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 51230 M 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 51230 M is size 23 of 28 in the Rotec AI catalogue for the “512 light-medium” series. The next size down, the 51228, has a bore of 140 mm and a dynamic rating of 190 kN. The next size up, the 51232 M, has a bore of 160 mm and a rating of 238 kN (+0%).
Common problems on bearings like the 51230 M
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 51230 M
What are the dimensions of a 51230 M bearing?
The 51230 M has a bore of 150 mm and an outside diameter of 215 mm. It is a single-direction thrust ball bearing. Series: 512 light-medium.
What is the load rating of a 51230 M bearing?
In the Rotec AI catalogue the 51230 M has a basic dynamic load rating C of 238 kN and a basic static load rating C0 of 800 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 51230 M bearing?
Brand equivalents for the 51230 M are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.