6203 bearing
17 × 40 mm · dynamic rating 9.95 kN · static rating 4.75 kN. Dimensions, load ratings, designation meaning, life estimates and equivalent parts.
6203 specification
| Designation | 6203 |
| Type | Deep groove ball bearing |
| Series | 62 light |
| Bore diameter d | 17 mm |
| Outside diameter D | 40 mm |
| Basic dynamic load rating C | 9.95 kN (9,950 N) |
| Basic static load rating C0 | 4.75 kN (4,750 N) |
| Ratio C0/C | 0.48 |
| Speed guide, grease lubrication | 24,000 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 6203 means
| Code | Meaning |
|---|---|
| 62 | Deep groove ball bearing, light dimension series |
| 03 | bore code "03" = 17 mm (one of the four fixed small-bore codes, not the ×5 rule) |
Basic rating life of the 6203
Basic rating life is L10 = (C / P)p million revolutions, where P is the equivalent dynamic load and p = 3 (ball bearing). For a 6203 with C = 9.95 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 1.99 kN on this bearing. Use the Load Calculator to work out P for your actual radial and axial loads.
Equivalents of the 6203 from other brands
These parts share the main boundary dimensions of the 6203 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 | 6203 | 9.95 | 4.75 | Reference |
| FAG | 6203-C | 10.4 | 4.75 | 105% of SKF |
| Timken | 6203 | 9.6 | 4.8 | 96% 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 6203 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 6203 belongs to the “62 light” series. The next size down, the 6202, has a bore of 15 mm and a dynamic rating of 8.06 kN. The next size up, the 6204, has a bore of 20 mm and a rating of 13.5 kN (+36%).
Common problems on bearings like the 6203
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 6203
What are the dimensions of a 6203 bearing?
The 6203 has a bore of 17 mm and an outside diameter of 40 mm. It is a deep groove ball bearing. Series: 62 light.
What is the load rating of a 6203 bearing?
In the Rotec AI catalogue the 6203 has a basic dynamic load rating C of 9.95 kN and a basic static load rating C0 of 4.75 kN. Always confirm against the manufacturer's current catalogue.
What is the equivalent of a 6203 bearing?
Equivalent parts include FAG 6203-C; Timken 6203. Check clearance, cage and seal suffixes before substituting.