Manufactured by CHG Bearing, the NNU 4980 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 400 mm bore diameter, a 540 mm outer diameter, and a 140 mm overall width. This component is designed to meet standard load requirements and ensure consistent operational performance. For comprehensive technical evaluation, please explore the detailed specifications, dimensional data, product images, and CAD drawings provided below. A complete PDF data sheet is also readily available for direct download to support your engineering and procurement needs.
NNU 4980 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4980 B/SPW33 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Super-precision Cylindrical Roller Bearing |
| Design Type | Cylindrical Bore |
| Structure (Drawing Reference) | Complete Bearing |
| Number of Rows | 2 |
| Ring Type | None |
| Design | NNU Design |
| Tolerance Class | SP |
| Bearing Material | Bearing Steel |
| Coating | None |
| Sealing | None |
| Lubricant | None |
| Features | Annular Lubrication Groove and Lubrication Holes |
| Number of Flanges – Outer Ring | 3 |
| Number of Ribs – Inner Ring | 0 |
| Dimensions | |
| Bore Diameter (d) | 400 mm |
| Width (B) | 140 mm |
| Outer Diameter (D) | 540 mm |
| Minimum Chamfer Dimension rmin | 3 mm |
| Inner Ring Chamfer | 4 mm |
| Outer Ring Chamfer | 4 mm |
| End-face Height Difference h | 5.5 mm |
| Outer-Ring Land Diameter (L2 / D1) | 490.8 mm |
| Inner Ring Raceway Diameter F | 446 mm |
| Shaft Shoulder Diameter dₐ, min. | 415 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 441 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 451 mm |
| Housing Shoulder Diameter Dₐ, max. | 524 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 1470 kN |
| Basic Static Load Rating C₀ (kN) | 3800 kN |
| Limiting Speed – Grease (r/min) | 1300 r/min |
| Limiting Speed – Oil-air (r/min) | 1500 r/min |
| Fatigue Load Limit Pᵤ (kN) | 335 kN |
| Material | |
| Lubrication Groove Width | 16.7 mm |
| Lubrication Holes (qty × Ø mm) | 9 |
| Weight (kg) | 92.5 kg |
| Radial Internal Clearance | C1 mm |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 448.8 |
NNU 4980 B/SPW33 540 mm 400 mm 140 mm Frequently Asked Questions about NNU 4980 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Standard batches of CHG Bearing NNU 4980 B/SPW33 conform strictly to ISO Class Normal (ABEC-1). For high-precision machine tool spindles, gearboxes, or robotics requiring tighter runouts, CHG Bearing can provide custom batches graded to ISO Class 6 (P6/ABEC-3) or ISO Class 5 (P5/ABEC-5) with 100% micrometer verification.
The Open Type engineered for NNU 4980 B/SPW33 by CHG Bearing utilizes precision non-contact metal shields or reinforced NBR/FKM contact lip seals. This barrier prevents particulate ingress, washdown fluids, and abrasive dust from reaching the raceways while eliminating grease leakage under centrifugal forces.
The CHG Bearing NNU 4980 B/SPW33 is rated for limiting speeds up to standard rated RPM under forced oil-mist or circulating oil lubrication regimes. When lubricated with factory-filled synthetic high-speed grease, safe continuous velocity is maintained at approximately 75% to 85% of the maximum nominal limit, preventing thermal runaway.
Every production batch of CHG Bearing NNU 4980 B/SPW33 Super-Precision Cylindrical Roller Bearings comes with complete traceability. Upon shipment, CHG Bearing can provide EN 10204 3.1 Material Test Reports (MTR), Certificates of Conformity (CoC), spectral chemical composition analysis, and dimensional inspection sheets.
