51314 bearing
70 × 125 mm · dynamic rating 135 kN · static rating 320 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
51314 specification
| Designation | 51314 |
| Type | Single-direction thrust ball bearing |
| Series | 513 medium |
| Bore diameter d | 70 mm |
| Outside diameter D | 125 mm |
| Basic dynamic load rating C | 135 kN (135,000 N) |
| Basic static load rating C0 | 320 kN (320,000 N) |
| Ratio C0/C | 2.37 |
| Speed guide, grease lubrication | 2,600 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 51314 means
| Code | Meaning |
|---|---|
| 513 | Single-direction thrust ball bearing, medium series (flat seat washers) |
| 14 | bore code "14" = 14 × 5 = 70 mm |
Basic rating life of the 51314
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 51314 with C = 135 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 27 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 51314
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 51314 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 51314 is size 10 of 15 in the Rotec AI catalogue for the “513 medium” series. The next size down, the 51313, has a bore of 65 mm and a dynamic rating of 106 kN. The next size up, the 51315, has a bore of 75 mm and a rating of 163 kN (+21%).
Common problems on bearings like the 51314
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 51314
What are the dimensions of a 51314 bearing?
The 51314 has a bore of 70 mm and an outside diameter of 125 mm. It is a single-direction thrust ball bearing. Series: 513 medium.
What is the load rating of a 51314 bearing?
In the Rotec AI catalogue the 51314 has a basic dynamic load rating C of 135 kN and a basic static load rating C0 of 320 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 51314 bearing?
Brand equivalents for the 51314 are not yet in the Rotec AI tables. Use the Cross-Reference tool to check other designations.