71932 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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71932 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71932 ACD/P4AQBCA is a high-precision quadruplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched set configuration provides superior stiffness and moment load capacity, making it ideal for machine tool spindles and other high-performance machinery. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, while the phenolic cage and optimized 25° contact angle contribute to stable operation at high speeds. This bearing is pre-lubricated for immediate use and is engineered to handle combined radial and axial loads simultaneously with high reliability.
71932 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71932 | Basic bearing designation, indicating a metric angular contact ball bearing with a 160mm bore and 220mm outside diameter. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration. |
| QBC | Quadruplex Back-to-Back arrangement. Four bearings are matched and mounted in a back-to-back configuration to provide maximum system rigidity. |
71932 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and significant moment loads. This design is critical for applications where shaft deflection must be minimized.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 11,000 rpm. The optimized internal geometry further enhances high-speed performance.
- Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees precise running accuracy, low noise, and low vibration, which is essential for the finish quality in machining operations.
- Optimized Internal Design: With 28 high-precision chrome steel balls and a 25° contact angle, the bearing provides an excellent balance between radial and axial load carrying capacity.
- Ready-to-Install: The bearing is supplied pre-lubricated, simplifying installation and ensuring immediate, reliable operation.
71932 ACD/P4AQBCA Bearing Typical Application Areas
The 71932 ACD/P4AQBCA is engineered for high-precision, high-stiffness applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding extreme accuracy and surface finish.
- High-Frequency Machining Centers: Where rapid acceleration and deceleration are required.
- Other Precision Rotary Equipment: Such as high-speed pumps and specialized test equipment.
