KOYO 6311 Bearing — Specifications, Dimensions & Cross-Reference
The KOYO 6311 is a deep groove ball bearing manufactured by KOYO. It belongs to the 6300 series and features dimensions of 55 × 120 × 29 mm (bore × OD × width). This bearing has a dynamic load rating of 71,500 N and a static load rating of 45,000 N, making it suitable for heavy-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 55 mm |
| Outside Diameter (D) | 120 mm |
| Width (B) | 29 mm |
| Weight | 1.350 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 71,500 N |
| Static Load Rating (C₀r) | 45,000 N |
| Limiting Speed (Grease) | 5,600 rpm |
| Limiting Speed (Oil) | 6,700 rpm |
Brand Cross-Reference — 6311 Equivalents
The following bearings from other manufacturers are interchangeable with the KOYO 6311. All share identical dimensions (55×120×29mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| KOYO | KOYO 6311 ✦ | 71,500 | 45,000 |
| Timken | Timken 6311 | 71,500 | 45,000 |
| SKF | SKF 6311 | 71,500 | 45,000 |
| NTN | NTN 6311 | 71,500 | 45,000 |
| NACHI | NACHI 6311 | 71,500 | 45,000 |
| FAG | FAG 6311 | 71,500 | 45,000 |
| Timken | Timken 6311 | 71,500 | 45,000 |
| NSK | NSK 6311 | 71,500 | 45,000 |
| NTN | NTN 6311 | 71,500 | 45,000 |
| SKF | SKF 6311 | 71,500 | 45,000 |
Available Variants
The KOYO 6311 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the KOYO 6311?
The KOYO 6311 has a bore diameter of 55mm, outside diameter of 120mm, and width of 29mm. It weighs 1.350kg.
What is the load capacity of the KOYO 6311?
The dynamic load rating (Cr) is 71,500 N and the static load rating (C₀r) is 45,000 N. The maximum recommended speed is 5,600 rpm with grease lubrication or 6,700 rpm with oil lubrication.
What bearings are equivalent to KOYO 6311?
The 6311 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 55×120×29mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.