NSK 7309 Bearing — Specifications, Dimensions & Cross-Reference
The NSK 7309 is a angular contact ball bearing manufactured by NSK. It belongs to the 7300 series and features dimensions of 45 × 100 × 25 mm (bore × OD × width). This bearing has a dynamic load rating of 55,300 N and a static load rating of 34,000 N, making it suitable for heavy-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 45 mm |
| Outside Diameter (D) | 100 mm |
| Width (B) | 25 mm |
| Weight | 0.781 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 55,300 N |
| Static Load Rating (C₀r) | 34,000 N |
| Limiting Speed (Grease) | 6,300 rpm |
| Limiting Speed (Oil) | 7,500 rpm |
Brand Cross-Reference — 7309 Equivalents
The following bearings from other manufacturers are interchangeable with the NSK 7309. All share identical dimensions (45×100×25mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NSK | NSK 7309 ✦ | 55,300 | 34,000 |
| NTN | NTN 7309 | 55,300 | 34,000 |
| KOYO | KOYO 7309 | 55,300 | 34,000 |
| FAG | FAG 7309 | 55,300 | 34,000 |
| NACHI | NACHI 7309 | 55,300 | 34,000 |
| Timken | Timken 7309 | 55,300 | 34,000 |
| NTN | NTN 7309 | 55,300 | 34,000 |
| SKF | SKF 7309 | 55,300 | 34,000 |
Available Variants
The NSK 7309 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NSK 7309?
The NSK 7309 has a bore diameter of 45mm, outside diameter of 100mm, and width of 25mm. It weighs 0.781kg.
What is the load capacity of the NSK 7309?
The dynamic load rating (Cr) is 55,300 N and the static load rating (C₀r) is 34,000 N. The maximum recommended speed is 6,300 rpm with grease lubrication or 7,500 rpm with oil lubrication.
What bearings are equivalent to NSK 7309?
The 7309 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 45×100×25mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.