71910 ACD/P4AQBCC
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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71910 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71910 ACD/P4AQBCC is a super-precision angular contact ball bearing designed for the most demanding applications. Its primary advantage lies in its matched quadruplex back-to-back (QBC) arrangement, which provides exceptional system rigidity and the ability to withstand combined radial and axial loads from both directions simultaneously. Manufactured to the stringent P4A tolerance class with a 25° contact angle and a moderate preload (Class C), this bearing is engineered for high-speed operation, superior running accuracy, and long-term reliability in precision machinery.
71910 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71910 | Bearing series and size designation | Indicates a 50 mm bore, 72 mm OD, 48 mm width bearing from the 719 series. |
| AC | Angular Contact | Optimized for combined loads with a defined contact angle. |
| D | High Contact Angle (25°) | Provides higher axial load capacity. |
| P4A | Tolerance Class | Denotes super-precision dimensional and running accuracy, superior to ABEC 7. |
| QB | Special Group Back-to-Back Mounting | Specifies the pre-set axial clearance/preload for the matched set. |
| CC | Moderate Preload (Class C) | Optimizes bearing stiffness and system natural frequency for high-speed applications. |
71910 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back arrangement of four bearings creates an extremely stiff bearing system, capable of handling heavy combined radial and axial loads and resisting overturning moments. This configuration is ideal for applications requiring maximum shaft positioning accuracy.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the P4A precision and optimized internal geometry contribute to low vibration and heat generation, enabling a high limiting speed of 46,000 rpm.
Pre-optimized for Performance: The set comes pre-lubricated and with a factory-set moderate preload (Class C). This eliminates complex mounting calculations and ensures immediate, optimal performance with enhanced system rigidity from installation.
Premium Materials: Constructed from chrome steel for rings and balls, the bearing ensures high durability, long fatigue life, and consistent performance within a temperature range of -30°C to 110°C.
71910 ACD/P4AQBCC Bearing Typical Application Areas
The 71910 ACD/P4AQBCC is engineered for high-precision, high-speed machinery where ultimate rigidity and accuracy are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindle motors for IT and semiconductor manufacturing equipment.
- Robotics: High-accuracy rotary joints and arm actuators.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
