Manufactured by CHG Bearing, the NNU 4928 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 140 mm bore diameter, a 190 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 4928 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4928 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) | 140 mm |
| Width (B) | 50 mm |
| Outer Diameter (D) | 190 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) | 172 mm |
| Inner Ring Raceway Diameter F | 156 mm |
| Shaft Shoulder Diameter dₐ, min. | 147 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 154 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 159 mm |
| Housing Shoulder Diameter Dₐ, max. | 182 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 190 kN |
| Basic Static Load Rating C₀ (kN) | 400 kN |
| Limiting Speed – Grease (r/min) | 4000 r/min |
| Limiting Speed – Oil-air (r/min) | 4500 r/min |
| Reference Grease Quantity Gref (cm³) | 45 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 41.5 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 3670 N/µm |
| Material | |
| Lubrication Groove Width | 5.5 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 4.17 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 157 |
NNU 4928 B/SPW33 190 mm 140 mm 50 mm Frequently Asked Questions about NNU 4928 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
When fitting NNU 4928 B/SPW33 over a 140 mm shaft, CHG Bearing strictly recommends uniform induction heating (controlled between 90°C and 110°C) or precision hydraulic press sleeves. Under no circumstances should direct impact blows be struck against the rings or cage, as shock loads cause brinelling indents and premature spalling.
To safeguard CHG Bearing NNU 4928 B/SPW33 against fretting wear and false brinelling during transport or vibration, assemble mating surfaces (140 mm x 190 mm) using anti-fretting mounting paste. Maintaining strict alignment and avoiding prolonged static vibration will preserve raceway polish.
The CHG Bearing NNU 4928 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.
Model NNU 4928 B/SPW33 is manufactured by CHG Bearing in standard Normal clearance (CN) for ambient temperature transmission, and C3 or C4 clearance for heavy duty applications. C3 clearance compensates for radial shrinkage caused by tight shaft press-fits (bore 140 mm) and steep thermal gradients between inner and outer rings.
