7028 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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7028 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7028 CD/HCP4ADGA is a precision angular contact ball bearing designed for the most demanding high-performance applications. Engineered to simultaneously handle combined radial and axial loads, this bearing features a universal matchable (SU) design that allows for flexible mounting arrangements in pairs. Its construction with ceramic balls and a P4A super-precision tolerance class ensures exceptional rotational accuracy, low heat generation, and extended service life, making it ideal for high-speed, high-rigidity spindles and other critical machinery.
7028 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| CD | 15° contact angle and optimized internal geometry | Optimized for high-speed operation and superior axial load capacity. |
| HC | Hybrid Ceramic (Silicon Nitride balls) | Reduced friction, lower operating temperature, and extended lubricant life. |
| P4A | Super Precision Tolerance Class | Guarantees extreme running accuracy and minimal vibration for critical applications. |
| DGA | Universal Matchable (SU), Extra Light Preload | Simplifies mounting in duplex pairs (DB, DF, DT) for enhanced system rigidity without custom selection. |
7028 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and robust construction provide excellent resistance to deformation under combined loads. The universal matchable pairing allows two bearings to be mounted together to create a highly rigid, preloaded system capable of handling significant radial and bidirectional axial forces.
- Superior High-Speed Performance: The combination of ceramic balls (lower density than steel) and a lightweight phenolic cage significantly reduces centrifugal forces, enabling a high limiting speed of 6,300 rpm. The 15° contact angle is specifically chosen for high-speed applications.
- Precision & Longevity: Manufactured to P4A tolerance class with a pre-lubricated open design, this bearing ensures minimal runout and consistent performance. The hybrid ceramic design offers inherent electrical insulation and dramatically increased service life, especially in challenging operating conditions.
7028 CD/HCP4ADGA Bearing Typical Application Areas
The 7028 CD/HCP4ADGA is specified 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 Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for electric vehicles and industrial automation.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
