7208 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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7208 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7208 CD/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. Operating as a universal matchable (SU) pair, this bearing is designed to handle combined radial and axial loads simultaneously. Its core advantages stem from a P4A super-precision tolerance class, a ceramic ball construction, and an extra light preload (Class A), making it an ideal solution for high-speed spindles and other high-reliability machinery where minimal runout and thermal stability are critical.
7208 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40 mm bore, 80 mm OD, and 36 mm width. |
| CD | Contact angle of 15° and a universal matchable (SU) design. |
| HC | Hybrid Ceramic construction, featuring ceramic balls for reduced friction and higher speed capability. |
| P4A | Indicates a super-precision tolerance class with running accuracy better than ABEC 7/ISO P4. |
| DGA | Designates a phenolic cage and that the bearing is lubricated from the factory. |
7208 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces friction, heat generation, and wear, enabling higher limiting speeds (41,000 rpm) and extended service life compared to all-steel bearings.
- Super-Precision & High Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional control, this bearing ensures exceptional running accuracy and rotational stability. The universal matchable (SU) pairing allows for a rigid bearing arrangement capable of withstanding complex combined loads.
- Optimized for High-Speed Operation: The combination of a lightweight phenolic cage, ceramic balls, and a 15° contact angle is engineered to minimize centrifugal forces and operating temperature, which is critical for maintaining precision at ultra-high speeds.
- Preload and Matching: Supplied with an extra light preload (Class A) and as a universally matchable set of 2 bearings, this configuration simplifies installation and ensures immediate, precise performance without additional adjustment.
7208 CD/HCP4ADGA Bearing Typical Application Areas
The 7208 CD/HCP4ADGA is specifically designed for high-performance applications where speed, precision, and reliability are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging devices.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors and Spindles used in the semiconductor and electronics manufacturing industries.
