NNUD 6056 ECMAS/P53 Four-row Rolling Mills Bearing, Stamping Steel Cage
The NNUD 6056 ECMAS/P53 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 NNUD 6056 ECMAS/P53 bearing is a Four-row cylindrical roller bearing for rolling mills with an inner diameter of 280 mm , an outer diameter of 420 mm, a width of 250 mm. It typically uses Class 5 (P5) grade precision tolerances and GCr15, ZGCr15, GCr15SiMn, 20Cr2Ni4A rings, GCr15, ZGCr15, GCr15SiMn, 20Cr2Ni4A rolling mlement. Its dynamic radial rated load is approximately 3688936 N, its static radial rated load is approximately 6547827 N. It uses C3 standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NNUD 6056 ECMAS/P53 bearings ( 280 mm x 420 mm x 250 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 | NNUD 6056 ECMAS/P53 |
| Interchangeable | SKF NNUD 6056 ECMAS/P53 |
| Bearing Type | Four-row cylindrical roller bearing for rolling mills |
| Cage | Stamping steel cage |
| Accuracy class | Class 5 (P5) |
| Radial internal clearance | C3 |
| Seal | Open |
| Bore Type | Cylindrical bore |
| Design variant | BC4.13/W |
| Series | NNUD 60.. ECMAS/P53 |
| Coating | No |
| Units | Metric |
| Lubricant | No |
| Bearing part | Complete |
| Ring | outer ring(5),inner ring(0) |
| Flange | No |
| Relubrication | No |
| Heat stabilized | 150 °C(300 °F) |
| Cr Radial Dynamic [lbf] | 829272 |
| C0r Radial Static [lbf] | 1471951 |
| Pu Fatigue load limit [lbf] | 143484 |
| nB Speed ratings (grease) [rpm] | 610 |
| Dimension | |
| d φ Inside [inch] | 11.024 |
| D Φ Outside [inch] | 16.535 |
| B Inner Width [inch] | 9.843 |
| C Outer Width [inch] | 9.843 |
| D1 [inch] | 14.874 |
| F [inch] | 12.362 |
| r1, r2(min.) [mm] | 4 |
| r3, r4(min.) [mm] | 4 |
| s Permissible axial displacement [inch] | 0.118 |
The NNUD 6056 ECMAS/P53 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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