Super-precision double row cylindrical roller bearing with tapered bore and lubrication feature
Super-precision double row cylindrical roller bearings in the NNU 49 series are designed to accommodate heavy radial loads and high speeds, while providing a high degree of stiffness. Having three flanges on the outer ring and no flanges on the inner ring, the bearings can accommodate axial displacement in both directions. The separable design simplifies mounting and dismounting, particularly when load conditions require both rings to have an interference fit. The tapered bore enables accurate adjustment of clearance or preload during mounting.
- High radial load carrying capacity
- Very high rigidity and high running accuracy
- Minimize noise, vibration and heat generation
- Accommodate axial displacement in both directions
- Lubrication feature
- Thin section enabling compact application design
Dimensions
| Bore diameter | 500 mm |
| Outside diameter | 670 mm |
| Width | 170 mm |
Performance
| Attainable speed for grease lubrication | 950 r/min |
| Attainable speed for oil-air lubrication | 1 100 r/min |
| Basic dynamic load rating | 2 330 kN |
| Basic static load rating | 6 100 kN |
Properties
| Bearing part | Complete bearing |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Coating | Without |
| Design | NNU |
| Loose flange | None |
| Lubricant | None |
| Material, bearing | Bearing steel |
| Number of flanges, inner ring | 0 |
| Number of flanges, outer ring | 3 |
| Number of rows | 2 |
| Radial internal clearance | C1 |
| Relubrication feature | Annular groove and lubrication holes |
| Sealing | Without |
| Tolerance class | Class SP (SP) |
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