71920 ACE/P4AQBCA
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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Product Overview and Core Advantages
The 71920 ACE/P4AQBCA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This quadruplex back-to-back matched set delivers superior performance in handling combined loads while maintaining P4A tolerance class precision. Its optimized design provides outstanding high rigidity and stable rotational characteristics, making it ideal for high-speed, high-precision machinery where uncompromising performance is essential.
71920 ACE/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Significance |
|---|---|---|
| ACE | 25° Contact Angle, Extra Light Preload | Optimized for high-speed operation with minimal friction |
| P4A | High Precision Tolerance Class | Exceptional dimensional accuracy and running precision |
| QBC | Quadruplex Back-to-Back Arrangement | Enhanced moment stiffness and load distribution |
Structural Features and Performance Benefits
High Rigidity Design: The quadruplex back-to-back configuration creates an exceptionally stiff bearing system capable of withstanding heavy combined loads and moment loads, ensuring precise shaft positioning under demanding conditions.
Superior Load Capacity: With a radial dynamic load rating of 21,938 lbf and radial static load rating of 27,000 lbf, this bearing set delivers reliable performance in applications requiring substantial load-carrying capability.
High-Speed Performance: The phenolic cage material and 25° contact angle optimize the bearing for high-speed operation up to 16,000 rpm, providing stable rotation with minimal heat generation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore tolerance: -0.004mm to 0), ensuring consistent performance and interchangeability in precision assemblies.
71920 ACE/P4AQBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles
- Precision Gearboxes: Industrial transmission systems requiring high rigidity
- Robotic Systems: High-accuracy robotic joints and positioning mechanisms
- Aerospace Components: Flight control systems and auxiliary power units
- Medical Equipment: High-speed dental handpieces and surgical tools
- Test and Measurement: Precision rotary tables and coordinate measuring machines
