71809 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71809 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71809 ACD/P4DBB is a metric duplex pair of precision angular contact ball bearings, pre-matched in a Back-to-Back (DB) arrangement. This configuration is engineered to provide exceptional high rigidity and superior capacity for handling combined loads (radial and axial loads simultaneously) from both directions. Manufactured to P4 tolerance class, it delivers the high running accuracy essential for demanding, high-speed applications. The light preload (Class B) minimizes deflection and ensures optimal performance in precision systems.
71809 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71809 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex pair of two bearings. |
| P4 | Specifies the high precision tolerance class for superior running accuracy. |
| DBB | Defines the Back-to-Back (DB) matched arrangement, providing high moment rigidity. |
71809 ACD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Load Capacity: The duplex Back-to-Back (DB) arrangement creates a wide effective spread between load centers, significantly increasing the bearing set's resistance to moment loads and ensuring high rigidity for the entire shaft system.
- Superior Combined Load Handling: The inherent angular contact design with a 25° contact angle allows the bearing pair to efficiently support substantial radial loads and bidirectional axial loads simultaneously.
- High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction, reduced heat generation, and stable operation at the high limiting speed of 46,000 rpm.
- Precision & Accuracy: Manufactured to P4 tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, this bearing guarantees precise shaft positioning and minimal runout.
- Optimized for Performance: The set comes pre-lubricated and is ready for installation, ensuring immediate and reliable operation within the specified temperature range.
71809 ACD/P4DBB Bearing Typical Application Areas
This high-precision, high-rigidity bearing pair is ideally suited for applications requiring exceptional accuracy and stability, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
