7208 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7208 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7208 CDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single bearing features a 15° contact angle and is manufactured to P4A super-precision tolerance class, ensuring minimal runout and superior rotational accuracy. Its core advantages include the ability to handle combined loads (radial and axial), achieving high-speed operation up to 41,000 rpm, and offering high rigidity due to its optimized internal design. The use of a phenolic cage and ceramic balls further enhances its high-speed capability and longevity.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40 mm bore and 80 mm outside diameter. |
| CD | A 15° contact angle design. |
| GA | Indicates a Universal Matchable (SU) bearing, designed to be mounted in sets (in this case, sets of 4) to achieve specific preload and stiffness characteristics. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls. |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, for ultra-high running accuracy. |
7208 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, lowers operating temperature, and extends service life, making it ideal for high-speed applications.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction at high speeds, contributing to the bearing's limiting speed of 41,000 rpm.
- Precision Ground Geometry: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, ensuring predictable performance and ease of installation in precision assemblies.
- Optimized Load Capacity: With a dynamic load rating of 7605 lbf and a static load rating of 5400 lbf, this bearing is capable of handling significant combined loads while maintaining high precision.
- Universal Matching (SU): Bearings are universally matchable, allowing for flexible mounting in various preloaded configurations (e.g., back-to-back, face-to-face) to achieve the desired system rigidity and running accuracy.
7208 CDGA/HCP4A Bearing Typical Application Areas
This high-performance bearing is specifically designed for advanced machinery and systems where high speed, high rigidity, and superior precision are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small tool spindles.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical rotating assemblies.
- Medical Equipment: Centrifuges and advanced diagnostic imaging devices.
