71809 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71809 CD/P4DBA Bearing Product Overview & Core Advantages
The 71809 CD/P4DBA is a precision duplex angular contact ball bearing specifically designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair configuration delivers superior performance in handling combined loads, including significant radial loads and axial loads in both directions. Manufactured to P4 tolerance class and featuring an extra light preload (Class A), this bearing is engineered for high-speed operation, precise positioning, and long-term reliability in demanding industrial environments. Its compact design with a 45 mm bore and 58 mm outside diameter makes it an ideal solution for space-constrained, high-performance applications.
71809 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing designation, indicating a metric angular contact ball bearing with a 45 mm bore and 58 mm outside diameter. |
| C | 15° contact angle, optimized for handling combined radial and axial loads. |
| D | Duplex bearing (two single bearings supplied as a set). |
| P4 | High precision tolerance class, ensuring extremely tight dimensional and running accuracy for applications requiring minimal runout and vibration. |
| DB | Back-to-Back arrangement. This configuration provides high rigidity and can accommodate moment loads, making it highly stable. |
| A | Extra light preload (Class A). This preload minimizes deflection under light loads, enhances stiffness, and ensures precise shaft positioning without generating excessive heat. |
71809 CD/P4DBA Bearing Structural Features & Performance Benefits
- Superior Rigidity and Stability: The back-to-back (DB) duplex design creates a wide, rigid support system that significantly increases moment stiffness and resists operational deflection, crucial for maintaining precision under heavy combined loads.
- Optimized Load Capacity: With a 15° contact angle and a high ball count (31 balls), this bearing is engineered to efficiently support substantial radial loads and bidirectional axial loads simultaneously.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground components and optimized internal geometry contribute to a high limiting speed of 46,000 rpm, making it an excellent high-speed bearing.
- Precision Performance: Manufactured to P4 tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures minimal runout and vibration for applications demanding the highest levels of accuracy.
- Pre-lubricated for Immediate Use: The bearing comes lubricated from the factory, ready for installation and initial operation, simplifying the mounting process.
71809 CD/P4DBA Bearing Typical Application Areas
The 71809 CD/P4DBA is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high rotational accuracy and stiffness.
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Industrial Pumps and Compressors
- Robotic Arms and Precision Gearboxes
- Medical and Laboratory Equipment
