S7211 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S7211 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S7211 CDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional speed, rigidity, and accuracy. Engineered as a single bearing with a Universal Matchable (SU) designation, it can be precisely paired with others to form a matched set of up to 4 bearings for optimal system performance. Its core advantages include the ability to handle combined loads (radial and axial), facilitated by a 15° contact angle, and outstanding high-speed capabilities up to 34,000 rpm, thanks to its ceramic balls and phenolic cage. The sealed design with pre-lubrication ensures long-term, maintenance-free operation.
S7211 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Advantage |
|---|---|---|
| S7211 | Basic bearing series and size designation (55mm bore, 100mm OD). | Defines the standard bearing dimensions. |
| CD | 15° contact angle and high-precision construction. | Optimized for handling combined loads. |
| GA | Indicates Extra Light (Class A) preload. | Minimizes deflection for superior running accuracy in high-speed applications. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls. | Reduces centrifugal forces, enabling higher speeds, lower operating temperatures, and longer service life. |
| P4A | Super-precision tolerance class (equivalent to ABEC 7). | Ensures extremely tight dimensional and running accuracy for critical applications. |
S7211 CDGA/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of ceramic balls significantly reduces weight and inertial forces, which is critical for achieving the high limiting speed of 34,000 rpm. This also results in lower heat generation and increased stiffness.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance at high rotational speeds, contributing to smooth and reliable operation.
High Rigidity & Load Capacity: The angular contact design and extra light preload provide high system rigidity, enabling precise control under combined radial and axial loads (dynamic load rating: 12,442 lbf).
Sealed & Pre-lubricated: The integrated seals protect against contamination and retain the high-performance grease, offering a maintenance-free solution within the specified temperature range of -30°C to 110°C.
S7211 CDGA/HCP4A Bearing Typical Application Areas
The S7211 CDGA/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the utmost in running accuracy.
- High-Frequency Motors and Spindles: Where extreme rotational speeds are required.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and other critical rotating assemblies.
