51307 bearing
35 × 68 mm · dynamic rating 49.4 kN · static rating 96.5 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
51307 specification
| Designation | 51307 |
| Type | Single-direction thrust ball bearing |
| Series | 513 medium |
| Bore diameter d | 35 mm |
| Outside diameter D | 68 mm |
| Basic dynamic load rating C | 49.4 kN (49,400 N) |
| Basic static load rating C0 | 96.5 kN (96,500 N) |
| Ratio C0/C | 1.95 |
| Speed guide, grease lubrication | 4,800 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 51307 means
| Code | Meaning |
|---|---|
| 513 | Single-direction thrust ball bearing, medium series (flat seat washers) |
| 07 | bore code "07" = 7 × 5 = 35 mm |
Basic rating life of the 51307
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 51307 with C = 49.4 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 9.88 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 51307
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 51307 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 51307 belongs to the “513 medium” series. The next size down, the 51306, has a bore of 30 mm and a dynamic rating of 35.8 kN. The next size up, the 51308, has a bore of 40 mm and a rating of 61.8 kN (+25%).
Common problems on bearings like the 51307
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 51307
What are the dimensions of a 51307 bearing?
The 51307 has a bore of 35 mm and an outside diameter of 68 mm. It is a single-direction thrust ball bearing. Series: 513 medium.
What is the load rating of a 51307 bearing?
In the Rotec AI catalogue the 51307 has a basic dynamic load rating C of 49.4 kN and a basic static load rating C0 of 96.5 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 51307 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 51307.