NTN 6311-2RS-C3 Bearing — Specifications, Dimensions & Cross-Reference
The NTN 6311-2RS-C3 is a deep groove ball bearing double rubber sealed manufactured by NTN. 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 — 6311-2RS-C3 Equivalents
The following bearings from other manufacturers are interchangeable with the NTN 6311-2RS-C3. All share identical dimensions (55×120×29mm) and comparable load ratings:
| Brand | Part Number | Dynamic Load (N) | Static Load (N) |
|---|---|---|---|
| NTN | NTN 6311-2RS-C3 ✦ | 71,500 | 45,000 |
| Timken | Timken 6311-2RS-C3 | 71,500 | 45,000 |
| SKF | SKF 6311-2RS-C3 | 71,500 | 45,000 |
| NTN | NTN 6311-2RS-C3 | 71,500 | 45,000 |
| NACHI | NACHI 6311-2RS-C3 | 71,500 | 45,000 |
| KOYO | KOYO 6311-2RS-C3 | 71,500 | 45,000 |
| FAG | FAG 6311-2RS-C3 | 71,500 | 45,000 |
| Timken | Timken 6311-2RS-C3 | 71,500 | 45,000 |
| NSK | NSK 6311-2RS-C3 | 71,500 | 45,000 |
| SKF | SKF 6311-2RS-C3 | 71,500 | 45,000 |
Available Variants
The NTN 6311 base bearing is available in these configurations:
Frequently Asked Questions
What are the dimensions of the NTN 6311-2RS-C3?
The NTN 6311-2RS-C3 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 NTN 6311-2RS-C3?
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 NTN 6311-2RS-C3?
The 6311-2RS-C3 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.