Manufactured by CHG Bearing, the NNU 4952 BK/SPW33 is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 260 mm bore diameter, a 360 mm outer diameter, and a 100 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 4952 BK/SPW33 - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 4952 BK/SPW33 |
| Brand | CHG® |
| Characteristics | |
| Bearing Type | Super-precision Cylindrical Roller Bearing |
| Design Type | Tapered Bore 1:12 |
| 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) | 260 mm |
| Width (B) | 100 mm |
| Outer Diameter (D) | 360 mm |
| Minimum Chamfer Dimension rmin | 2 mm |
| Inner Ring Chamfer | 2.1 mm |
| Outer Ring Chamfer | 1.1 mm |
| End-face Height Difference h | 4.5 mm |
| Outer-Ring Land Diameter (L2 / D1) | 325.6 mm |
| Inner Ring Raceway Diameter F | 292 mm |
| Shaft Shoulder Diameter dₐ, min. | 271 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 288 mm |
| Housing Shoulder Diameter Dₐ, max. | 349 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 748 kN |
| Basic Static Load Rating C₀ (kN) | 1700 kN |
| Limiting Speed – Grease (r/min) | 2000 r/min |
| Limiting Speed – Oil-air (r/min) | 2400 r/min |
| Reference Grease Quantity Gref (cm³) | 366 cm³ |
| Fatigue Load Limit Pᵤ (kN) | 163 kN |
| Axial Static Stiffness – Guideline Value (N/µm) | 6830 N/µm |
| Material | |
| Lubrication Groove Width | 13.9 mm |
| Lubrication Holes (qty × Ø mm) | 3 |
| Weight (kg) | 30.4 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
| Mounting Dimensions | |
| Lubrication Port Thread / Size Φ1 | 294.5 |
NNU 4952 BK/SPW33 360 mm 260 mm 100 mm Frequently Asked Questions about NNU 4952 BK/SPW33 Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Sourcing NNU 4952 BK/SPW33 directly from CHG Bearing eliminates intermediate brokerage markups while granting you factory-direct engineering backup, rigorous ISO-certified quality assurance, competitive volume wholesale pricing, and dependable supply chain stability for Super-Precision Cylindrical Roller Bearings.
Following standard ISO 281 fatigue calculation guidelines, the nominal rating life (L10) of CHG Bearing NNU 4952 BK/SPW33 correlates its dynamic capacity (standard dynamic) with equivalent dynamic loads. In controlled industrial settings with proper contamination-free filtration, field data confirms continuous operational longevity exceeding 20,000 to 50,000 service hours.
Quality starts with raw material selection: CHG Bearing crafts NNU 4952 BK/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.
As standard production, CHG Bearing subjects NNU 4952 BK/SPW33 to precision bainite or martensite quenching, offering dimensional stability up to 120°C (248°F). For high-heat processing equipment, CHG Bearing also supplies custom S0 (150°C), S1 (200°C), or S2 (250°C) stabilization heat treatments upon request to prevent residual austenite transformation.
