71911 CD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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71911 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 71911 CD/P4AQBCA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a quadruplex back-to-back (QBC) matched set, this bearing is engineered to handle combined loads with superior stability. Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed, high-rigidity applications where minimal runout and maximum system performance are critical.
71911 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series, indicating a high-precision, light-series angular contact ball bearing. |
| C | Designates a 15° contact angle, optimized for high-speed operation. |
| D | Indicates the bearing is part of a matched set. |
| P4A | Specifies the ultra-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy. |
| QBC | Denotes the Quadruplex Back-to-Back arrangement of the matched set, providing high moment stiffness. |
| A | Signifies Extra Light Preload, minimizing friction and heat generation for superior high-speed performance. |
71911 CD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The back-to-back quadruplex arrangement creates a wide effective spread, significantly increasing the system's resistance to moment loads and ensuring exceptional operational stability.
Precision & Speed: Manufactured to P4A tolerance and featuring a lightweight phenolic resin cage, this bearing achieves a high limiting speed of 34,000 rpm with minimal vibration and heat buildup.
Optimized Load Capacity: The 15° contact angle is engineered to efficiently handle combined radial and axial loads, making it suitable for complex loading conditions.
Ready-to-Install: The bearing is pre-lubricated, facilitating immediate installation and ensuring optimal performance from initial operation.
71911 CD/P4AQBCA Bearing Typical Application Areas
The 71911 CD/P4AQBCA is specified for high-performance machinery requiring the utmost precision and speed, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics and Automation Arms
- High-Frequency Spindles for PCB drilling and routing
- Aerospace Gyroscopes and Navigation Systems
