SKF NNU4944BK/SPW33 super-precision cylindrical roller bearing (nn 30xx / n 10xx). Super-precision (ISO 492 P4A / P2A) double-row (NN 30xx) or single-row (N 10xx) cylindrical roller bearing designed as the non-locating position on a machine-tool spindle. Very high radial rigidity and running accuracy. Tapered bore (K suffix) allows radial preload to be set at assembly. Fitted with a machined brass cage.
| Type | Super-precision cylindrical roller bearing (NN 30xx / N 10xx) |
| Designation | SKF NNU4944BK/SPW33 |
| Bore d | 220 mm |
| HS code | 8482.20 |
| Bore diameter | 220 mm |
| Outside diameter | 300 mm |
| Width | 80 mm |
| Basic dynamic load rating | 512 kN |
| Basic static load rating | 1140 kN |
| Attainable speed for grease lubrication | 2400 r/min |
| Attainable speed for oil-air lubrication | 2800 r/min |
| Bearing part | Complete bearing |
| Number of rows | 2 |
| Bore type | Tapered 1:12 |
| Cage | Machined metal |
| Design | NNU |
| Number of flanges, outer ring | 3 |
| Number of flanges, inner ring | 0 |
| Loose flange | None |
| Radial internal clearance | C1 |
| Tolerance class | Class SP (SP) |
| Material, bearing | Bearing steel |
| Coating | Without |
| Sealing | Without |
| Lubricant | None |
| Relubrication feature | Annular groove and lubrication holes |
| Indicative carbon footprint for new product | 59.2 kg CO2e |
| Product net weight | 16 kg |
| eClass code | 23-05-09-01 |
| UNSPSC code | 31171505 |
| Material | As declared by SKF designation suffix |
| Temperature range | Per SKF product data |
| Primary standard | SKF designation convention |
| MOQ | 1 |
Interchange with peer OEM equivalents on identical boundary plan and execution — confirm cage, clearance, sealing and precision-class suffix before substitution.