71911 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71911 CD/P4A Bearing Product Overview & Core Advantages
The 71911 CD/P4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Its primary advantage lies in its ability to support combined loads (radial and axial loads simultaneously) efficiently, thanks to its defined 15° contact angle. Manufactured to a P4 (ABEC-7) tolerance class, this bearing is engineered for high-speed operation up to 26,000 rpm and is preloaded, ensuring minimal axial and radial play for superior system stiffness and positioning accuracy in demanding machinery.
71911 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | The basic bearing designation, indicating a metric, single row angular contact ball bearing with a 55 mm bore, 80 mm OD, and 13 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates that the bearing is manufactured with a high-precision phenolic (polyamide) cage. |
| P4A | Denotes the tolerance class P4 (ABEC-7), signifying very high dimensional and running accuracy. The "A" suffix often indicates specific accuracy and preload requirements for precision bearings. |
71911 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a P4 tolerance class and available preload ensures minimal deflection under load, providing exceptional system stability and accuracy for machine tool spindles and other precision equipment.
- Optimized Load Capacity: The 15° contact angle is engineered to handle significant combined radial and axial loads simultaneously, making it suitable for applications with complex loading conditions.
- Superior High-Speed Performance: The lightweight and robust phenolic cage (Cage material: Phenolic) minimizes centrifugal forces and ensures stable operation at the high limiting speed of 26,000 rpm. The open design facilitates efficient lubrication and cooling.
- High-Quality Components: Constructed from chrome steel for both rings and balls, the bearing offers high durability, wear resistance, and a long operational life under demanding conditions.
71911 CD/P4A Bearing Typical Application Areas
The 71911 CD/P4A is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles (e.g., milling, grinding, and machining centers)
- High-Frequency Motors and Spindles
- Precision Robotics and Automation Equipment
- Medical and Dental Equipment Spindles
- Aerospace Actuation and Control Systems
