71911 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71911 ACD/P4A Bearing Product Overview & Core Advantages
The 71911 ACD/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and superior rigidity. As a P4 (ABEC-7) tolerance class bearing, it delivers exceptional running accuracy, making it ideal for high-speed spindles and precision machinery. Its key advantage lies in its ability to accommodate combined loads—handling significant radial loads and unidirectional axial loads simultaneously, thanks to its defined 25° contact angle. The bearing is preloaded, ensuring minimal axial and radial play for enhanced system stiffness and positional accuracy. With a phenolic resin cage and optimized internal geometry, it achieves a high limiting speed of 24,000 rpm, supporting demanding operational requirements.
71911 ACD/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). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-precision, preloaded bearing assembly. |
| /P4A | Denotes the P4 (ABEC-7) tolerance class for exceptional dimensional and running accuracy. |
71911 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a 25° contact angle and factory-applied preload provides high axial and radial stiffness, minimizing deflection under load for superior positional accuracy.
- Superior Load Capacity: Engineered to handle combined radial and axial loads efficiently. With a dynamic load rating of 4095 lbf and a static load rating of 3082 lbf, it offers reliable performance in demanding conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures stability and low friction at high rotational speeds, contributing to the high limiting speed of 24,000 rpm.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life.
- Wide Operating Range: Suitable for a temperature range from -30°C to 110°C, accommodating various industrial environments.
71911 ACD/P4A Bearing Typical Application Areas
The 71911 ACD/P4A is engineered for high-performance applications where precision and speed are critical. Its primary uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- High-Frequency Motors and Spindles: Applications demanding minimal runout and vibration.
- Medical and Laboratory Equipment: Centrifuges and precision instruments.
- Aerospace Control Systems: Actuators and guidance mechanisms.
