51313 bearing
65 × 115 mm · dynamic rating 106 kN · static rating 240 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
51313 specification
| Designation | 51313 |
| Type | Single-direction thrust ball bearing |
| Series | 513 medium |
| Bore diameter d | 65 mm |
| Outside diameter D | 115 mm |
| Basic dynamic load rating C | 106 kN (106,000 N) |
| Basic static load rating C0 | 240 kN (240,000 N) |
| Ratio C0/C | 2.26 |
| Speed guide, grease lubrication | 3,000 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 51313 means
| Code | Meaning |
|---|---|
| 513 | Single-direction thrust ball bearing, medium series (flat seat washers) |
| 13 | bore code "13" = 13 × 5 = 65 mm |
Basic rating life of the 51313
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 51313 with C = 106 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 21.2 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 51313
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 51313 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 51313 belongs to the “513 medium” series. The next size down, the 51312, has a bore of 60 mm and a dynamic rating of 101 kN. The next size up, the 51314, has a bore of 70 mm and a rating of 135 kN (+27%).
Common problems on bearings like the 51313
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 51313
What are the dimensions of a 51313 bearing?
The 51313 has a bore of 65 mm and an outside diameter of 115 mm. It is a single-direction thrust ball bearing. Series: 513 medium.
What is the load rating of a 51313 bearing?
In the Rotec AI catalogue the 51313 has a basic dynamic load rating C of 106 kN and a basic static load rating C0 of 240 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 51313 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 51313.