7210 ACD/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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7210 ACD/HCP4AQBCA Bearing Product Overview & Core Advantages
The 7210 ACD/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for the most demanding applications. Engineered as a matched set of four bearings in a back-to-back (QBC) arrangement, it delivers exceptional system rigidity and can accommodate combined radial and axial loads. Featuring ceramic balls and a P4A super-precision tolerance, this bearing is optimized for high-speed operation and superior performance in machine tool spindles and other precision equipment.
7210 ACD/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Advantage |
|---|---|---|
| 7210 | Basic bearing series and size (50mm bore, 90mm OD) | Standardized bearing dimensions for easy integration. |
| ACD | Angular Contact, 25° contact angle | Optimized for high axial load capacity and rigidity. |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Reduced weight, lower friction, and higher limiting speed. |
| P4A | Super Precision Tolerance Class | Exceptional running accuracy for high-precision applications. |
| QBC | Quadruplex Back-to-Back arrangement | Provides maximum system rigidity and moment load capacity. |
| A | Extra Light Preload | Minimizes deflection at high speeds while maintaining low operating temperature. |
7210 ACD/HCP4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement of four preloaded bearings creates an exceptionally stiff bearing system, capable of handling heavy combined loads and significant moment loads. This configuration is ideal for applications requiring minimal shaft deflection.
Superior High-Speed Performance: The combination of hybrid ceramic balls (lighter than steel, reducing centrifugal force) and a phenolic resin cage allows for a very high limiting speed of 46,000 rpm. The phenolic cage offers excellent strength-to-weight ratio and operates smoothly at high velocities.
Precision & Longevity: Manufactured to P4A super-precision tolerances, this bearing ensures minimal runout and vibration, which is critical for achieving superior surface finishes in machining. The 25° contact angle is optimized to support substantial axial loads in high-speed spindle configurations.
7210 ACD/HCP4AQBCA Bearing Typical Application Areas
This precision bearing set is specifically engineered for high-performance machinery where extreme accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other sensitive instrumentation.
- High-Frequency Motors & Spindles: Motors for PCB drilling and other micro-machining applications.
