NSK 6904 Bearing — Specifications, Dimensions & Cross-Reference
The NSK 6904 is a deep groove ball bearing manufactured by NSK. It belongs to the 6900 series and features dimensions of 20 × 37 × 9 mm (bore × OD × width). This bearing has a dynamic load rating of 5,850 N and a static load rating of 3,250 N, making it suitable for light-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 20 mm |
| Outside Diameter (D) | 37 mm |
| Width (B) | 9 mm |
| Weight | 0.030 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 5,850 N |
| Static Load Rating (C₀r) | 3,250 N |
| Limiting Speed (Grease) | 17,000 rpm |
| Limiting Speed (Oil) | 24,000 rpm |
Brand Cross-Reference — 6904 Equivalents
The following bearings from other manufacturers are interchangeable with the NSK 6904. All share identical dimensions (20×37×9mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NSK | NSK 6904 ✦ | 5,850 | 3,250 |
| NTN | NTN 6904 | 5,850 | 3,250 |
| NACHI | NACHI 6904 | 5,850 | 3,250 |
| KOYO | KOYO 6904 | 5,850 | 3,250 |
| FAG | FAG 6904 | 5,850 | 3,250 |
| Timken | Timken 6904 | 5,850 | 3,250 |
| SKF | SKF 6904 | 5,850 | 3,250 |
| NTN | NTN 6904 | 5,850 | 3,250 |
Available Variants
The NSK 6904 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NSK 6904?
The NSK 6904 has a bore diameter of 20mm, outside diameter of 37mm, and width of 9mm. It weighs 0.030kg.
What is the load capacity of the NSK 6904?
The dynamic load rating (Cr) is 5,850 N and the static load rating (C₀r) is 3,250 N. The maximum recommended speed is 17,000 rpm with grease lubrication or 24,000 rpm with oil lubrication.
What bearings are equivalent to NSK 6904?
The 6904 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 20×37×9mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.