S7211 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S7211 ACD/HCP4A Bearing Product Overview & Core Advantages
The S7211 ACD/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. Engineered to simultaneously handle combined loads (radial and axial), this bearing features a compact design with a 25° contact angle for optimal axial load capacity. Its ceramic balls and P4 (ABEC-7) tolerance class ensure superior performance in high-speed, high-rigidity applications, making it ideal for precision machinery where minimal runout and maximum stability are critical.
S7211 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| ACD | Angular Contact, Duplex (Back-to-Back arrangement with preload) | Provides high rigidity and precise shaft positioning under combined loads |
| HC | Hybrid Ceramic (Ceramic balls with steel rings) | Reduced friction, higher speed capability, and extended service life |
| P4A | P4 Tolerance Class with specific running accuracy requirements | Ultra-precision performance suitable for high-speed spindle applications |
S7211 ACD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of ceramic balls and chrome steel rings significantly reduces centrifugal forces, enabling higher limiting speeds (15,000 rpm) while maintaining dimensional stability at elevated temperatures.
High Rigidity Design: The duplex arrangement with preload provides exceptional stiffness, minimizing deflection under heavy combined loads and ensuring precise rotational accuracy.
Optimized Cage Performance: The phenolic cage offers excellent strength-to-weight ratio and smooth operation at high speeds, contributing to the bearing's superior high-speed performance.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls, ensuring consistent performance and reliability in precision applications.
S7211 ACD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and precision grinding machines
- High-Speed Motors: Industrial spindles and servo motors requiring minimal vibration
- Precision Instruments: Measuring equipment and optical devices demanding high accuracy
- Aerospace Components: Guidance systems and auxiliary power units
- Medical Equipment: Dental handpieces and laboratory automation systems
