KOYO 6404 Bearing — Specifications, Dimensions & Cross-Reference
The KOYO 6404 is a deep groove ball bearing manufactured by KOYO. It belongs to the 6400 series and features dimensions of 20 × 72 × 19 mm (bore × OD × width). This bearing has a dynamic load rating of 31,000 N and a static load rating of 15,200 N, making it suitable for heavy-duty applications.
Technical Specifications
| Dimensions | |
|---|---|
| Bore Diameter (d) | 20 mm |
| Outside Diameter (D) | 72 mm |
| Width (B) | 19 mm |
| Weight | 0.399 kg |
| Performance | |
|---|---|
| Dynamic Load Rating (Cr) | 31,000 N |
| Static Load Rating (C₀r) | 15,200 N |
| Limiting Speed (Grease) | 9,500 rpm |
| Limiting Speed (Oil) | 13,000 rpm |
Brand Cross-Reference — 6404 Equivalents
The following bearings from other manufacturers are interchangeable with the KOYO 6404. All share identical dimensions (20×72×19mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| KOYO | KOYO 6404 ✦ | 31,000 | 15,200 |
| Timken | Timken 6404 | 31,000 | 15,200 |
| SKF | SKF 6404 | 31,000 | 15,200 |
| NTN | NTN 6404 | 31,000 | 15,200 |
| NACHI | NACHI 6404 | 31,000 | 15,200 |
| FAG | FAG 6404 | 31,000 | 15,200 |
| Timken | Timken 6404 | 31,000 | 15,200 |
| NSK | NSK 6404 | 31,000 | 15,200 |
| NTN | NTN 6404 | 31,000 | 15,200 |
| SKF | SKF 6404 | 31,000 | 15,200 |
Available Variants
The KOYO 6404 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the KOYO 6404?
The KOYO 6404 has a bore diameter of 20mm, outside diameter of 72mm, and width of 19mm. It weighs 0.399kg.
What is the load capacity of the KOYO 6404?
The dynamic load rating (Cr) is 31,000 N and the static load rating (C₀r) is 15,200 N. The maximum recommended speed is 9,500 rpm with grease lubrication or 13,000 rpm with oil lubrication.
What bearings are equivalent to KOYO 6404?
The 6404 is manufactured by multiple brands including SKF, NTN, NSK, FAG, Timken, KOYO, and NACHI. All versions share the same 20×72×19mm dimensions and are interchangeable in most applications. See the cross-reference table above for detailed comparisons.