71911 ACB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71911 ACB/P4A Bearing Product Overview & Core Advantages
The 71911 ACB/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and high-speed operation. Engineered to a P4 (ABEC-7) tolerance class, it delivers exceptional rotational accuracy. Its key advantage lies in its ability to support combined loads—handling significant radial loads alongside thrust loads in one direction. The bearing comes preloaded from the factory, ensuring immediate high rigidity and minimal axial play, making it ideal for demanding, high-accuracy applications where stability is paramount.
71911 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation. |
| ACB | Indicates a specific contact angle of 25° and a preload class, optimizing it for high rigidity and precise operation. |
| P4A | Denotes the tolerance class P4 (ABEC-7), signifying very high dimensional and running accuracy. |
71911 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and factory-applied preload work in tandem to provide exceptional system stiffness, minimizing deflection under load and ensuring precise shaft positioning.
- Optimized Load Capacity: The angular contact design is engineered to efficiently support combined radial and axial loads simultaneously, making it superior to deep groove ball bearings in such demanding scenarios.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributes to lower operating temperatures, and enables a high limiting speed of 32,000 rpm. The bearing is pre-lubricated for immediate operation.
- Premium Materials: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and durability, suitable for a wide operating temperature range from -30°C to 110°C.
71911 ACB/P4A Bearing Typical Application Areas
The 71911 ACB/P4A is specified for high-performance machinery where precision and speed are critical. Its typical applications include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Robotic Drives and Actuators
- Medical and Dental Equipment
- Aerospace Instrumentation
