71920 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71920 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71920 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This quadruplex matched set features a back-to-back arrangement (QBC) and P4A tolerance class, delivering superior performance under combined radial and axial loads. With its moderate preload (Class C) and optimized 25° contact angle, it provides outstanding operational stability and positioning accuracy in high-precision machinery.
71920 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| ACD | 25° Contact Angle, High Precision Design | Optimized for combined loading conditions |
| P4A | Super Precision Tolerance Class | Exceptional running accuracy and dimensional stability |
| QBCC | Quadruplex Back-to-Back Matched Set with Moderate Preload | Enhanced system rigidity and preload consistency |
71920 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined radial and axial loads from multiple directions. With a radial dynamic load rating of 33,975 lbf and static load rating of 56,250 lbf, this configuration provides reliable performance under demanding operating conditions.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration. The phenolic cage material offers excellent dimensional stability and reduced friction, contributing to smooth operation at limiting speeds up to 15,000 rpm.
Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing delivers superior wear resistance and fatigue life. The combination of 26 balls with 12.7 mm diameter provides optimal load distribution and contact stress management.
71920 ACD/P4AQBCC Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding machines requiring extreme accuracy
- Precision Gearboxes: Industrial transmission systems demanding high rigidity and load capacity
- Robotic Systems: High-accuracy robotic arms and automation equipment
- Aerospace Components: Flight control systems and aircraft instrumentation
- Medical Equipment: Advanced medical imaging systems and surgical robots
- Test & Measurement Instruments: Precision measuring devices and calibration equipment
