71911 CD/P4ADBG20
71900 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
71911 CD/P4ADBG20 Bearing Product Overview & Core Advantages
The 71911 CD/P4ADBG20 is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a matched duplex pair in a Back-to-Back (DB) arrangement, it is pre-configured to provide superior stiffness and stability when subjected to combined loads (radial and axial). Its P4A tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other precision machinery where high rigidity and reliability are critical.
71911 CD/P4ADBG20 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Bearing series and size designation (55mm bore, 80mm OD). |
| C | 15° contact angle, optimized for high-speed performance and axial load capacity. |
| D | Indicates a duplex pair of bearings. |
| P4A | High-precision tolerance class (exceeds ABEC 7), ensuring minimal runout and vibration. |
| DB | Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability under complex loads. |
| G20 | Specifies the preload level applied to the matched set for optimal stiffness and running accuracy. |
71911 CD/P4ADBG20 Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex Back-to-Back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, providing exceptional operational stability.
Superior Load Capacity: The angular contact design with a 15° contact angle allows the bearing to efficiently handle combined radial and axial loads simultaneously. The matched set ensures balanced load distribution.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 34,000 rpm. The open design facilitates efficient lubrication and cooling.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore diameter, outside diameter, and width, this bearing guarantees precise shaft running and low vibration levels.
71911 CD/P4ADBG20 Bearing Typical Application Areas
The 71911 CD/P4ADBG20 is engineered for high-performance applications, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and High-Speed Spindles
- Precision Gearboxes and Robotic Drives
- Medical Equipment and Dental Handpieces
- Aerospace Actuation Systems
