KOYO 51103 Bearing — Specifications, Dimensions & Cross-Reference
The KOYO 51103 is a thrust ball bearing manufactured by KOYO. It belongs to the 51100 series and features dimensions of 17 × 30 × 9 mm (bore × OD × width). This bearing has a dynamic load rating of 8,830 N and a static load rating of 6,240 N, making it suitable for light-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 17 mm |
| Outside Diameter (D) | 30 mm |
| Width (B) | 9 mm |
| Weight | 0.026 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 8,830 N |
| Static Load Rating (C₀r) | 6,240 N |
| Limiting Speed (Grease) | 8,500 rpm |
| Limiting Speed (Oil) | 11,000 rpm |
Brand Cross-Reference — 51103 Equivalents
The following bearings from other manufacturers are interchangeable with the KOYO 51103. All share identical dimensions (17×30×9mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| KOYO | KOYO 51103 ✦ | 8,830 | 6,240 |
| Timken | Timken 51103 | 8,830 | 6,240 |
| SKF | SKF 51103 | 8,830 | 6,240 |
| NACHI | NACHI 51103 | 8,830 | 6,240 |
| Timken | Timken 51103 | 8,830 | 6,240 |
| FAG | FAG 51103 | 8,830 | 6,240 |
| NSK | NSK 51103 | 8,830 | 6,240 |
| NTN | NTN 51103 | 8,830 | 6,240 |
| SKF | SKF 51103 | 8,830 | 6,240 |
Available Variants
The KOYO 51103 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the KOYO 51103?
The KOYO 51103 has a bore diameter of 17mm, outside diameter of 30mm, and width of 9mm. It weighs 0.026kg.
What is the load capacity of the KOYO 51103?
The dynamic load rating (Cr) is 8,830 N and the static load rating (C₀r) is 6,240 N. The maximum recommended speed is 8,500 rpm with grease lubrication or 11,000 rpm with oil lubrication.
What bearings are equivalent to KOYO 51103?
The 51103 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 17×30×9mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.