Manufactured by CHG Bearing, the NNU 49/500 BK/SPW33X is a precision Super-Precision Cylindrical Roller Bearings. Key dimensional parameters include a 500 mm bore diameter, a 670 mm outer diameter, and a 170 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 49/500 BK/SPW33X - Super-Precision Cylindrical Roller Bearings
Technical Specifications
| Overview | |
|---|---|
| Part Number | NNU 49/500 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) | 500 mm |
| Width (B) | 170 mm |
| Outer Diameter (D) | 670 mm |
| Minimum Chamfer Dimension rmin | 4 mm |
| Inner Ring Chamfer | 5 mm |
| Outer Ring Chamfer | 9.8 mm |
| End-face Height Difference h | 3.5 mm |
| Outer-Ring Land Diameter (L2 / D1) | 611.6 mm |
| Inner Ring Raceway Diameter F | 554 mm |
| Shaft Shoulder Diameter dₐ, min. | 548 mm |
| Shaft Shoulder Diameter dₐ, max. – NNU Design | 548 mm |
| Housing Shoulder Diameter Dₐ, max. | 652 mm |
| Performance | |
| Basic Dynamic Load Rating C (kN) | 2330 kN |
| Basic Static Load Rating C₀ (kN) | 6100 kN |
| Limiting Speed – Grease (r/min) | 950 r/min |
| Limiting Speed – Oil-air (r/min) | 1100 r/min |
| Fatigue Load Limit Pᵤ (kN) | 490 kN |
| Material | |
| Lubrication Groove Width | 22.3 mm |
| Lubrication Holes (qty × Ø mm) | 12 |
| Weight (kg) | 165 kg |
| Radial Internal Clearance | C1 mm |
| Internal Design & Weight | |
| Cage Type | Machined Metal Cage |
NNU 49/500 BK/SPW33X 670 mm 500 mm 170 mm Frequently Asked Questions about NNU 49/500 BK/SPW33X Super-Precision Cylindrical Roller Bearings
Find key technical answers regarding dimensions, specifications, and replacement options for this model.
Engineered according to international ISO boundary plans, CHG Bearing supplies NNU 49/500 BK/SPW33X with a precision bore diameter (d) of 500 mm, an outside diameter (D) of 670 mm, and a nominal ring width (B) of 170 mm. This configuration yields an effective cross-sectional wall thickness of 85.0 mm and an envelope ratio (D/d) of 1.34, delivering compact rigidity for OEM machinery housings.
To extend the trouble-free lifespan of CHG Bearing NNU 49/500 BK/SPW33X, 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.
Beyond standard alloy steel, CHG Bearing can customize the NNU 49/500 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.
Sourcing NNU 49/500 BK/SPW33X 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.
