NTN 6903 Bearing — Specifications, Dimensions & Cross-Reference
The NTN 6903 is a deep groove ball bearing manufactured by NTN. It belongs to the 6900 series and features dimensions of 17 × 30 × 7 mm (bore × OD × width). This bearing has a dynamic load rating of 3,450 N and a static load rating of 2,070 N, making it suitable for light-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 17 mm |
| Outside Diameter (D) | 30 mm |
| Width (B) | 7 mm |
| Weight | 0.016 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 3,450 N |
| Static Load Rating (C₀r) | 2,070 N |
| Limiting Speed (Grease) | 20,000 rpm |
| Limiting Speed (Oil) | 28,000 rpm |
Brand Cross-Reference — 6903 Equivalents
The following bearings from other manufacturers are interchangeable with the NTN 6903. All share identical dimensions (17×30×7mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NTN | NTN 6903 ✦ | 3,450 | 2,070 |
| NTN | NTN 6903 | 3,450 | 2,070 |
| NACHI | NACHI 6903 | 3,450 | 2,070 |
| KOYO | KOYO 6903 | 3,450 | 2,070 |
| FAG | FAG 6903 | 3,450 | 2,070 |
| Timken | Timken 6903 | 3,450 | 2,070 |
| NSK | NSK 6903 | 3,450 | 2,070 |
| SKF | SKF 6903 | 3,450 | 2,070 |
Available Variants
The NTN 6903 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NTN 6903?
The NTN 6903 has a bore diameter of 17mm, outside diameter of 30mm, and width of 7mm. It weighs 0.016kg.
What is the load capacity of the NTN 6903?
The dynamic load rating (Cr) is 3,450 N and the static load rating (C₀r) is 2,070 N. The maximum recommended speed is 20,000 rpm with grease lubrication or 28,000 rpm with oil lubrication.
What bearings are equivalent to NTN 6903?
The 6903 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×7mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.