Manufactured by CHG Bearing, the NNU 49/670 BK/SPW33X is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 670 mm bore diameter, a 900 mm outer diameter, and a 230 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 49/670 BK/SPW33X - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 49/670 BK/SPW33X |
| 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) | 670 mm |
| Width (B) | 230 mm |
| Outer Diameter (D) | 900 mm |
| Minimum Chamfer Dimension rmin | 5 mm |
| Inner Ring Chamfer | 6 mm |
| Outer Ring Chamfer | 3 mm |
| End-face Height Difference h | 6 mm |
| Outer-Ring Land Diameter (L2 / D1) | 821.2 mm |
| Outer Ring Raceway Diameter E | 842 mm |
| Inner Ring Raceway Diameter F | 738 mm |
| Shaft Shoulder Diameter dₐ, min. | 693 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 732 mm |
| Shaft Shoulder Diameter dᵦ, min. – NNU Design | 744 mm |
| Housing Shoulder Diameter Dₐ, max. | 877 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 4950 kN |
| Basic Static Load Rating C₀ (kN) | 13700 kN |
| Limiting Speed – Grease (r/min) | 700 r/min |
| Limiting Speed – Oil-air (r/min) | 600 r/min |
| Fatigue Load Limit Pᵤ (kN) | 930 kN |
| Material | |
| Lubrication Groove Width | 22.3 mm |
| Lubrication Holes (qty × Ø mm) | 12 |
| Weight (kg) | 410 kg |
| Radial Internal Clearance | CN mm |
NNU 49/670 BK/SPW33X 900 mm 670 mm 230 mm Frequently Asked Questions about NNU 49/670 BK/SPW33X Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Built for demanding industrial environments, the NNU 49/670 BK/SPW33X Super-Precision Cylindrical Roller Bearings by CHG Bearing boasts a dynamic load rating (Cr) of standard dynamic and a static load threshold (C0r) of standard static. The optimized internal raceway geometry balances stress distribution, mitigating edge loading even when operating under peak mechanical stresses.
Following standard ISO 281 fatigue calculation guidelines, the nominal rating life (L10) of CHG Bearing NNU 49/670 BK/SPW33X 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.
Every production batch of CHG Bearing NNU 49/670 BK/SPW33X 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.
Beyond standard alloy steel, CHG Bearing can customize the NNU 49/670 BK/SPW33X Super-Precision Cylindrical Roller Bearings using AISI 440C stainless steel, black oxide coating, zinc-nickel plating, or hybrid ceramic (Si3N4) balls for applications involving chemical exposure, marine salt fog, or galvanic current hazards.
