7211 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7211 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7211 CD/HCP4ADBA is a duplex back-to-back angular contact ball bearing designed for high-precision applications requiring exceptional rigidity and speed capabilities. This P4A super-precision bearing features a ceramic ball construction and phenolic cage, enabling superior performance in demanding conditions. Its duplex DB arrangement provides optimal stiffness and moment load capacity, making it ideal for applications where combination loads and high rotational accuracy are critical.
7211 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| CD | Duplex Back-to-Back Arrangement | Provides high rigidity and moment load capacity |
| HC | Hybrid Ceramic Balls | Enhanced speed capability and reduced heat generation |
| P4A | Super Precision Tolerance Class | Exceptional running accuracy and dimensional stability |
| DB | Back-to-Back Mounting | Optimized for combination radial and axial loads |
| A | Extra Light Preload | Minimal friction while maintaining stiffness |
Structural Features & Performance Advantages
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride ceramic balls significantly reduces centrifugal forces, enabling higher limiting speeds (34,000 rpm) while maintaining dimensional stability across the operating temperature range (-30°C to 110°C).
Enhanced Rigidity: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and combination loads, with a 15° contact angle optimized for both radial and axial load carrying capacity.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), ensuring exceptional running accuracy and minimal vibration in high-speed applications.
Thermal Stability: The phenolic cage material provides excellent dimensional stability and reduced weight, contributing to the bearing's high-speed performance while withstanding temperature variations.
7211 CD/HCP4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and precision grinding spindles
- Industrial Pumps: Chemical process pumps and high-pressure circulating systems
- Precision Instrumentation: Measuring equipment and laboratory instruments
- Aerospace Systems: Gyroscopes and navigation equipment requiring high accuracy
- High-Speed Motors: Spindle motors and servo drives demanding minimal runout
