NU 228 ECM/C3VL2071 Bore 140 Mm, INSOCOAT Cylindrical Roller Bearings, Single Row, NU Design
The NU 228 ECM/C3VL2071 INSOCOAT cylindrical roller bearings are widely used in industrial motors (variable frequency motors), railway traction motors, wind turbines, papermaking machinery (exhaust gas recirculation fans), rail transit drive systems, and variable frequency drive equipment—any application where shaft current risks exist.
The NU 228 ECM/C3VL2071 bearing is a INSOCOAT cylindrical roller bearings, single row, NU design with an inner diameter of 140 mm , an outer diameter of 250 mm, a width of 42 mm. It typically uses PN grade precision tolerances and GCr15SiMn rings, GCr15SiMn rolling mlement. Its dynamic radial rated load is approximately 448618 N, its static radial rated load is approximately 508522 N. It uses C3 standard radial clearance, Open type, together determine its load-bearing capacity, rotational accuracy, and applicable working conditions.
NU 228 ECM/C3VL2071 bearings ( 140 mm x 250 mm x 42 mm) have the advantages of Insulated against electrolytic corrosion, combining the high radial load capacity and high rigidity of cylindrical roller bearings, and are therefore widely used in the Electric motors, generators, frequency converters, railway traction, machine tools and industrial machinery.
| Part Number | NU 228 ECM/C3VL2071 |
| Interchangeable | SKF NU 228 ECM/C3VL2071 |
| Cage | M = a machined brass cage, riveted, roller centred |
| Bearing Type | INSOCOAT cylindrical roller bearings, single row, NU design |
| Load | radial |
| Accuracy class | PN |
| Coating | VL2071 = inner surfaces, aluminium oxide coated |
| Bearing part | Complete |
| Internal design | EC = Optimized internal design incorporating more and/or larger rollers and with modified roller end / flange contact |
| Design | NU |
| Internal clearance | C3 |
| Row NO. | One |
| Seal | Open |
| Number of ring | outer ring(2), inner ring(0) |
| Units | Metric |
| Manufacturer Part Code | NU228ECM/C3VL2071 |
| Series | NU 2 series (NU 2.. ECM/C3VL2071) |
| Lubrication | NO |
| Locating feature | NO |
| Relubrication feature | NO |
| Loose flange | NO |
| Weight [lb] | 19.8414 |
| Cr Radial Dynamic [lbf] | 100849 |
| C0r Radial Static [lbf] | 114315 |
| Pu Fatigue load limit [lbf] | 12768 |
| nB Speed ratings (grease) [rpm] | 2726 |
| nG Speed ratings (oil) [rpm] | 3143 |
| d φ Inside [inch] | 5.5118 |
| D Φ Outside [inch] | 9.8425 |
| B Thickness [inch] | 1.6535 |
| F [inch] | 6.654 |
| r1,2 min Chamfer [inch] | 0.1181 |
| r3,4 min Chamfer [inch] | 0.1181 |
| D1 [inch] | 8.5433 |
| s max. Permissible axial displacement [inch] | 0.0984 |
| Axial displacement capability | In both directions |
The NU 228 ECM/C3VL2071 INSOCOAT cylindrical roller bearings are primarily composed of an inner ring, outer ring, cylindrical rollers, a cage, and an electrically insulating coating. The outer surfaces of both the inner and outer rings are coated with an approximately 100μm thick alumina coating using a plasma spraying process. The suffix VL0241 indicates a coated outer ring, and VL2071 indicates a coated inner ring. NU-type bearings have flanged outer rings and unflappable inner rings, allowing for bidirectional axial displacement and featuring a separable design.
INSOCOAT cylindrical roller bearings possess excellent electrical insulation properties, effectively preventing current flow and avoiding electro-corrosion damage. They achieve a minimum resistance of 50MΩ at 1000VDC and can withstand voltages up to 3000VDC. They also feature high radial load capacity, low friction, and a long service life, and installation and maintenance are no different from ordinary bearings.
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