7212 ACD/HCP4AQBCD
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7212 ACD/HCP4AQBCD is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This matched set arrangement of four bearings in a back-to-back (QBC) configuration provides superior stability and can accommodate combined radial and axial loads simultaneously. Manufactured to P4A tolerance class and featuring a heavy preload (Class D), this bearing is engineered for high-precision, high-stiffness applications where maximum rotational accuracy is critical.
7212 ACD/HCP4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7212 | Basic bearing series with 60 mm bore, 110 mm OD |
| ACD | Angular Contact Design with 25° contact angle |
| HC | Heavy Preload (Class D) |
| P4A | High Precision Tolerance Class |
| QBC | Quadruplex Back-to-Back Matched Arrangement |
Structural Features and Performance Benefits
Exceptional Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments. This configuration provides superior axial and radial stiffness, making it ideal for applications requiring minimal deflection.
High-Speed Performance: Featuring a phenolic cage and ceramic balls, this bearing achieves a limiting speed of 31,000 rpm. The lightweight cage material and ceramic balls reduce centrifugal forces, enabling stable operation at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing ensures precise running accuracy and minimal vibration. The 25° contact angle optimizes load distribution for both radial and axial forces.
Advanced Material Selection: The combination of chrome steel rings and ceramic balls provides excellent wear resistance and extended service life, particularly in demanding operating conditions.
7212 ACD/HCP4AQBCD Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers and grinding spindles requiring maximum rigidity and accuracy
- High-Speed Spindles: CNC machining applications where high rotational speeds and precision are essential
- Precision Instrumentation: Advanced measuring equipment and scientific instruments demanding exceptional running accuracy
- Robotics and Automation: High-precision robotic joints and positioning systems
- Aerospace Components: Critical rotating assemblies in aerospace applications requiring reliability and precision
