71911 CE/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71911 CE/P4A Bearing Product Overview & Core Advantages
The 71911 CE/P4A is a single-row angular contact ball bearing designed for precision applications requiring exceptional rotational accuracy and high-speed capability. Manufactured to P4 (ABEC-7) tolerance class, it delivers superior running precision. Its key advantage lies in its ability to accommodate combined loads (simultaneous radial and axial loads) efficiently. The 15° contact angle is optimized for high-speed operation while maintaining thrust capacity. Pre-loaded and pre-lubricated from the factory, this bearing offers high rigidity and is ready for immediate installation in demanding, high-reliability systems.
71911 CE/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD, 13mm width). |
| C | Specifies a 15° contact angle. |
| E | Indicates an optimized internal design with more and larger balls, enhancing load capacity. |
| P4 | Denotes a high precision tolerance class equivalent to ABEC-7. |
| A | Signifies that the bearing is supplied with a specific preload for immediate high-rigidity performance. |
71911 CE/P4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Design: The combination of a phenolic resin cage and a 15° contact angle is engineered for stable operation at high rotational speeds (limiting speed of 36,000 rpm). The phenolic cage offers low mass and excellent performance under high centrifugal forces.
Superior Load Capacity: The "E"-type internal design incorporates a 21-ball configuration with a larger ball diameter (7.938 mm), significantly boosting both the dynamic (3510 lbf) and static (2385 lbf) load ratings compared to standard designs.
Precision & Reliability: Manufactured from chrome steel for both rings and balls, and held to P4 precision tolerances, this bearing ensures minimal vibration and long-term dimensional stability. The open seal type allows for optimal re-lubrication in specific applications, while the pre-applied lubricant ensures immediate operation.
71911 CE/P4A Bearing Typical Application Areas
The 71911 CE/P4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In high-accuracy joints and arm assemblies.
- Aerospace & Defense Systems: In gyroscopes, actuators, and auxiliary power units.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
