Manufactured by CHG Bearing, the NNU 4926 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 130 mm bore diameter, a 180 mm outer diameter, and a 50 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 4926 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4926 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) | 130 mm |
| Width (B) | 50 mm |
| Outer Diameter (D) | 180 mm |
| Minimum Chamfer Dimension rmin | 1.5 mm |
| Inner Ring Chamfer | 1.5 mm |
| Outer Ring Chamfer | 1.5 mm |
| End-face Height Difference h | 2.2 mm |
| Outer-Ring Land Diameter (L2 / D1) | 162 mm |
| Inner Ring Raceway Diameter F | 146 mm |
| Shaft Shoulder Diameter dₐ, min. | 137 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 144 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 149 mm |
| Housing Shoulder Diameter Dₐ, max. | 172 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 187 kN |
| Basic Static Load Rating C₀ (kN) | 390 kN |
| Limiting Speed – Grease (r/min) | 4300 r/min |
| Limiting Speed – Oil-air (r/min) | 4800 r/min |
| Reference Grease Quantity Gref (cm³) | 31 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 41.5 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 3570 N/µm |
| Material | |
| Lubrication Groove Width | 5.5 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 4.05 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 147 |
NNU 4926 B/SPW33 180 mm 130 mm 50 mm Frequently Asked Questions about NNU 4926 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
To match diverse operational dynamics, CHG Bearing supplies NNU 4926 B/SPW33 with multiple cage configurations: high-strength pressed steel ribbon cages for standard duty, solid machined brass cages (M/CA) for heavy vibration and shock loads, or lightweight glass-fiber reinforced polyamide cages (TN9/TVP) for high acceleration and ultra-low noise.
The CHG Bearing NNU 4926 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.
To ensure optimum performance of CHG Bearing NNU 4926 B/SPW33 Super-Precision Cylindrical Roller Bearings under general rotational loads, our application engineers advise an inner-ring shaft tolerance of m5 or k5 for the 130 mm bore. For the 180 mm outer ring, an H7 or J7 housing bore fit is recommended to eliminate creep while accommodating normal thermal gradient expansion.
Quality starts with raw material selection: CHG Bearing crafts NNU 4926 B/SPW33 inner and outer rings from high-purity High-Quality Chrome Steel (GCr15/100Cr6). Our raw billets undergo vacuum degassing and secondary ESR (electroslag remelting) processes to drastically eliminate non-metallic sulfide and oxide inclusions, elevating subsurface contact fatigue resistance.
