Manufactured by CHG Bearing, the NNU 4920 B/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 100 mm bore diameter, a 140 mm outer diameter, and a 40 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 4920 B/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4920 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) | 100 mm |
| Width (B) | 40 mm |
| Outer Diameter (D) | 140 mm |
| Minimum Chamfer Dimension rmin | 1 mm |
| Inner Ring Chamfer | 1.1 mm |
| Outer Ring Chamfer | 1.1 mm |
| End-face Height Difference h | 1.1 mm |
| Outer-Ring Land Diameter (L2 / D1) | 125.8 mm |
| Inner Ring Raceway Diameter F | 113 mm |
| Shaft Shoulder Diameter dₐ, min. | 106 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 111 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 116 mm |
| Housing Shoulder Diameter Dₐ, max. | 133.5 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 128 kN |
| Basic Static Load Rating C₀ (kN) | 255 kN |
| Limiting Speed – Grease (r/min) | 5600 r/min |
| Limiting Speed – Oil-air (r/min) | 6300 r/min |
| Reference Grease Quantity Gref (cm³) | 13 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 29 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 2950 N/µm |
| Material | |
| Lubrication Groove Width | 5.5 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 1.91 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 113.8 |
NNU 4920 B/SPW33 140 mm 100 mm 40 mm Frequently Asked Questions about NNU 4920 B/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
As a primary manufacturer, CHG Bearing supports both trial batch evaluations and container-load supply for NNU 4920 B/SPW33. Standard catalog sizes are stocked for rapid 3–7 day dispatch, while high-volume OEM production runs typically dispatch within 30–45 days.
Yes, 100% of NNU 4920 B/SPW33 Super-Precision Cylindrical Roller Bearings leaving CHG Bearing production lines are subjected to multi-frequency Anderometer sound testing. All units satisfy baseline Z1V1 levels, with dedicated quiet-running electric motor quality (EMQ) lots certified to Z2V2 and Z3V3 standards for silent machinery integration.
For international ocean and air freight, CHG Bearing packs NNU 4920 B/SPW33 with industrial VCI anti-corrosion barrier wrapping, sealed polybags, individual cartons, and fumigated ocean-worthy wooden crates. This multi-layer barrier guarantees rust-free storage for a minimum shelf life of 24 to 36 months.
To extend the trouble-free lifespan of CHG Bearing NNU 4920 B/SPW33, preventive maintenance routines should monitor operating housing temperature (normally maintaining below 70°C) and conduct regular vibration FFT analysis to identify early raceway micro-pitting before unexpected line halts occur.
