71924 ACD/P4AQBCD
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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Product Overview and Core Advantages
The 71924 ACD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This matched set arrangement features four bearings in a back-to-back configuration (QBC), delivering superior stability under combined loads. With its P4A tolerance class and heavy preload (Class D), this bearing is engineered for high-precision machinery where minimal deflection and maximum accuracy are critical. The phenolic cage and optimized 25° contact angle contribute to its reliable performance in high-stress environments.
71924 ACD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| ACD | Angular Contact, Double Row | Enhanced radial and axial load capacity |
| P4A | High Precision Tolerance Class | Superior running accuracy and minimal vibration |
| QBC | Quadruplex Back-to-Back Configuration | Maximum rigidity and moment load capacity |
| D | Heavy Preload Class | Eliminates internal clearance for precise positioning |
Structural Features and Performance Benefits
High Rigidity Design: The quadruplex back-to-back arrangement creates an extremely rigid bearing system that minimizes shaft deflection under heavy combined loads. This configuration provides superior resistance to moment loads and ensures precise shaft positioning.
Enhanced Load Capacity: With a radial dynamic load rating of 43,875 lbf and static load rating of 77,625 lbf, this bearing set handles significant radial and axial forces simultaneously. The 25° contact angle optimizes axial load carrying capability while maintaining excellent radial performance.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures consistent high-precision operation. The phenolic cage provides excellent strength-to-weight ratio and operates effectively at high speeds.
Optimized Performance: The bearing comes pre-lubricated and features an open design for customized lubrication solutions. With 28 precision balls of 14.288 mm diameter, it delivers smooth operation and long service life.
71924 ACD/P4AQBCD Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding machine spindles
- Industrial Gearboxes: Heavy-duty transmission systems requiring high rigidity
- Precision Rotary Tables: Indexing and positioning systems in manufacturing equipment
- Aerospace Actuators: Flight control systems and landing gear mechanisms
- Robotic Automation: High-accuracy robotic arms and precision positioning systems
- Medical Imaging Equipment: CT scanners and MRI gantry rotation systems
