NTN 6308-NR Bearing — Specifications, Dimensions & Cross-Reference
The NTN 6308-NR is a deep groove ball bearing with snap ring groove manufactured by NTN. It belongs to the 6300 series and features dimensions of 40 × 90 × 23 mm (bore × OD × width). This bearing has a dynamic load rating of 41,000 N and a static load rating of 24,000 N, making it suitable for heavy-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 40 mm |
| Outside Diameter (D) | 90 mm |
| Width (B) | 23 mm |
| Weight | 0.693 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 41,000 N |
| Static Load Rating (C₀r) | 24,000 N |
| Limiting Speed (Grease) | 7,500 rpm |
| Limiting Speed (Oil) | 9,000 rpm |
Brand Cross-Reference — 6308-NR Equivalents
The following bearings from other manufacturers are interchangeable with the NTN 6308-NR. All share identical dimensions (40×90×23mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NTN | NTN 6308-NR ✦ | 41,000 | 24,000 |
| Timken | Timken 6308-NR | 41,000 | 24,000 |
| SKF | SKF 6308-NR | 41,000 | 24,000 |
| NACHI | NACHI 6308-NR | 41,000 | 24,000 |
| KOYO | KOYO 6308-NR | 41,000 | 24,000 |
| FAG | FAG 6308-NR | 41,000 | 24,000 |
| Timken | Timken 6308-NR | 41,000 | 24,000 |
| NSK | NSK 6308-NR | 41,000 | 24,000 |
| SKF | SKF 6308-NR | 41,000 | 24,000 |
| NTN | NTN 6308-NR | 41,000 | 24,000 |
Available Variants
The NTN 6308 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NTN 6308-NR?
The NTN 6308-NR has a bore diameter of 40mm, outside diameter of 90mm, and width of 23mm. It weighs 0.693kg.
What is the load capacity of the NTN 6308-NR?
The dynamic load rating (Cr) is 41,000 N and the static load rating (C₀r) is 24,000 N. The maximum recommended speed is 7,500 rpm with grease lubrication or 9,000 rpm with oil lubrication.
What bearings are equivalent to NTN 6308-NR?
The 6308-NR is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 40×90×23mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.