NTN cylindrical roller bearings NUPK309NR 45x100x25mm
The NTN NUPK309NR is a high-quality single-row cylindrical roller bearing designed for superior radial load handling and precise axial positioning in industrial machinery. This bearing combines advanced engineering with robust construction to deliver reliable performance in challenging operating environments, making it an ideal choice for applications requiring high load capacity and precise shaft guidance.
The NTN NUPK309NR is a high-quality single-row cylindrical roller bearing designed for superior radial load handling and precise axial positioning in industrial machinery. This bearing combines advanced engineering with robust construction to deliver reliable performance in challenging operating environments, making it an ideal choice for applications requiring high load capacity and precise shaft guidance.
Key Specifications
| Parameter | Value |
|---|---|
| Model Number | NUPK309NR |
| Bearing Type | Single-Row Cylindrical Roller Bearing with Inner Ring Flanges and Snap Ring |
| Dimensions (d×D×B) | 45×100×25 mm |
| Bore Diameter (d) | 45 mm |
| Outer Diameter (D) | 100 mm |
| Width (B) | 25 mm |
| Material | Chrome Steel (GCr15/SUJ2) - high carbon chromium bearing steel |
| Cage Type | Pressed Steel (K-type) |
| Design Features | NUP configuration (inner ring with two lips, outer ring without lips) + NR (snap ring groove and snap ring on outer ring) |
| Clearance Class | Typically C3 (increased internal clearance for thermal expansion compensation) |
| Dynamic Load Rating (C) | Approximately 98.6 kN |
| Static Load Rating (C₀) | Approximately 100.5 kN |
| Limiting Speed (Grease) | Approximately 6,400 rpm |
| Limiting Speed (Oil) | Approximately 8,300 rpm |
Design & Performance Advantages
1. Advanced NUPK Configuration
The NUPK309NR features an NUP design with inner ring flanges on both sides and a K-type pressed steel cage that optimizes roller guidance and load distribution. This configuration enables the bearing to:
- Accommodate heavy radial loads and unidirectional axial loads (inner ring acts as a thrust collar)
- Maintain precise shaft positioning within the housing
- Allow for axial displacement of the shaft relative to the housing in one direction
2. NR Snap Ring Feature
The NR suffix indicates an integrated snap ring groove and snap ring on the outer ring, providing:
- Simplified axial fixing within the housing bore
- Space-saving installation compared to separate retaining rings
- Enhanced assembly efficiency and reduced maintenance time
3. High-Quality Materials & Construction
- Chrome steel (GCr15/SUJ2) raceways and rollers with precision grinding for optimal surface finish and wear resistance
- Pressed steel cage for high rigidity, durability, and heat resistance
- Controlled internal clearance (typically C3) to compensate for thermal expansion in high-temperature applications
- Precision manufacturing tolerances to ensure smooth operation and minimal vibration
Applications
The NTN NUPK309NR is ideally suited for a wide range of industrial applications requiring robust performance and precise positioning, including:
- Industrial gearboxes - for main shafts and countershafts handling high torque loads
- Electric motors and generators - for reliable operation in continuous-duty applications
- Pumps and compressors - for handling radial loads and axial thrust in rotating equipment
- Automotive transmissions - for gear shaft support in heavy-duty vehicles
- Steel and rolling mills - for back-up rolls and work rolls in demanding production environments
- Mining and construction equipment - for heavy machinery operating under harsh conditions
Installation & Maintenance Guidelines
- Mounting: The NUPK309NR should be press-fitted onto the shaft and located in the housing using the integrated snap ring
- Lubrication: Use high-quality lubricants appropriate for the operating temperature and speed range (grease or oil)
- Alignment: Ensure proper shaft and housing alignment to prevent edge loading and premature wear
- Maintenance: Regular lubrication monitoring and contamination control will maximize bearing service life
