6218 bearing
90 × 160 mm · dynamic rating 101 kN · static rating 73.5 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
6218 specification
| Designation | 6218 |
| Type | Deep groove ball bearing |
| Series | 62 light |
| Bore diameter d | 90 mm |
| Outside diameter D | 160 mm |
| Basic dynamic load rating C | 101 kN (101,000 N) |
| Basic static load rating C0 | 73.5 kN (73,500 N) |
| Ratio C0/C | 0.73 |
| Speed guide, grease lubrication | 5,300 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 6218 means
| Code | Meaning |
|---|---|
| 62 | Deep groove ball bearing, light dimension series |
| 18 | bore code "18" = 18 × 5 = 90 mm |
Basic rating life of the 6218
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 6218 with C = 101 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 20.2 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 6218 from other brands
These parts share the main boundary dimensions of the 6218 and are commonly used as its equivalent. Published load ratings differ a little between makers because internal designs differ.
| Brand | Part | C (kN) | C0 (kN) | Dynamic rating vs SKF |
|---|---|---|---|---|
| SKF | 6218 | 101 | 73.5 | Reference |
| Timken | 6218 | 96 | 71.5 | 95% of SKF |
Check clearance class, cage, seals and any special suffix before ordering. A matching main size does not guarantee the parts are interchangeable in every detail.
Where the 6218 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 6218 belongs to the “62 light” series. The next size down, the 6217, has a bore of 85 mm and a dynamic rating of 87.1 kN. The next size up, the 6219, has a bore of 95 mm and a rating of 114 kN (+13%).
Common problems on bearings like the 6218
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 6218
What are the dimensions of a 6218 bearing?
The 6218 has a bore of 90 mm and an outside diameter of 160 mm. It is a deep groove ball bearing. Series: 62 light.
What is the load rating of a 6218 bearing?
In the Rotec AI catalogue the 6218 has a basic dynamic load rating C of 101 kN and a basic static load rating C0 of 73.5 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 6218 bearing?
Equivalent parts include Timken 6218. Check clearance, cage and seal suffixes before substituting.