6315 bearing
75 × 160 mm · dynamic rating 119 kN · static rating 76.5 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
6315 specification
| Designation | 6315 |
| Type | Deep groove ball bearing |
| Series | 63 medium |
| Bore diameter d | 75 mm |
| Outside diameter D | 160 mm |
| Basic dynamic load rating C | 119 kN (119,000 N) |
| Basic static load rating C0 | 76.5 kN (76,500 N) |
| Ratio C0/C | 0.64 |
| Speed guide, grease lubrication | 5,600 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 6315 means
| Code | Meaning |
|---|---|
| 63 | Deep groove ball bearing, medium dimension series |
| 15 | bore code "15" = 15 × 5 = 75 mm |
Basic rating life of the 6315
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 6315 with C = 119 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 23.8 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 6315 from other brands
Deep groove ball bearings follow the ISO basic designation system, so the base number 6315 means the same bore (75 mm) and outside diameter (160 mm) at the major makers. Only the suffixes differ. For sealed versions, common suffixes are -2RS1 or -2Z at SKF, -2RSR or -2ZR at FAG, DDU or ZZ at NSK, and LLU or ZZ at NTN. Check clearance class, grease and seal type before substituting. For brand-specific part numbers, use the Cross-Reference tool.
Where the 6315 is used
Deep-groove ball bearings are chosen for: Radial load with moderate axial load; high-speed compact equipment. Typical equipment: Motors, fans, pumps, gearboxes, auxiliaries. Single/multi-row; insulated or stainless variants available.
Other sizes in the same series
The 6315 belongs to the “63 medium” series. The next size down, the 6314, has a bore of 70 mm and a dynamic rating of 111 kN. The next size up, the 6316, has a bore of 80 mm and a rating of 130 kN (+9%).
Common problems on bearings like the 6315
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 6315
What are the dimensions of a 6315 bearing?
The 6315 has a bore of 75 mm and an outside diameter of 160 mm. It is a deep groove ball bearing. Series: 63 medium.
What is the load rating of a 6315 bearing?
In the Rotec AI catalogue the 6315 has a basic dynamic load rating C of 119 kN and a basic static load rating C0 of 76.5 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 6315 bearing?
Use the Cross-Reference tool in Rotec AI to check brand equivalents for the 6315.