NNU 4976 B/DRW33 Four-row Rolling Mills Bearing, Machined Brass Cage
The NNU 4976 B/DRW33 Four-row cylindrical roller bearings is suitable for heavy machinery applications that bear huge radial loads. Classic applications include: support rolls of rolling mills, large gearboxes, heavy machine tool spindles, wind turbine spindles, ship propulsion shafts, and rotor supports for high-power compressors.
The NNU 4976 B/DRW33 bearing is a Four-row cylindrical roller bearing for rolling mills with an inner diameter of 380 mm , an outer diameter of 520 mm, a width of 280 mm. GCr15, ZGCr15, GCr15SiMn, 20Cr2Ni4A rings, GCr15, ZGCr15, GCr15SiMn, 20Cr2Ni4A rolling mlement. Its dynamic radial rated load is approximately 2857931 N, its static radial rated load is approximately 7198018 N. Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NNU 4976 B/DRW33 bearings ( 380 mm x 520 mm x 280 mm) have the advantages of Extremely high radial load capacity, high rigidity, separable design, and are therefore widely used in the metallurgical rolling mills, large gearboxes, and heavy-duty extrusion presses.
| Part Number | NNU 4976 B/DRW33 |
| Interchangeable | SKF NNU 4976 B/DRW33 |
| Bearing Type | Four-row cylindrical roller bearing for rolling mills |
| Cage | Machined brass cage |
| Seal | Open |
| Bore Type | Cylindrical bore |
| Design variant | E.3 |
| Series | NNU 49..B/DRW33 |
| Coating | No |
| Units | Metric |
| Weight [lb] | 407.851 |
| Bearing part | Complete |
| Heat stabilized | 150 °C(300 °F) |
| Cr Radial Dynamic [lbf] | 642462 |
| C0r Radial Static [lbf] | 1618114 |
| Dimension | |
| d φ Inside [inch] | 14.961 |
| D Φ Outside [inch] | 20.472 |
| B Inner Width [inch] | 11.024 |
| C Outer Width [inch] | 11.024 |
| D1 [inch] | 18.543 |
| F [inch] | 16.772 |
The NNU 4976 B/DRW33 Four-row cylindrical roller bearings mainly consist of an inner ring, an outer ring, four rows of cylindrical rollers, a cage, and a spacer. Common structures use a configuration of double outer rings (each with double raceways) and a single inner ring (with four raceways), or an interchangeable combination of inner and outer rings. Axial positioning and load distribution are achieved through the spacer.
The advantages of four-row cylindrical roller bearings are their extremely high radial load capacity, high rigidity, and the line contact between the rollers and raceways, resulting in a low coefficient of friction and allowing for high-speed operation under heavy loads. They can also be used as floating end bearings, capable of withstanding axial displacement caused by thermal expansion, and are easy to install and maintain.
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