7028 CD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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7028 CD/HCP4ADBC Bearing Product Overview & Core Advantages
The 7028 CD/HCP4ADBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and high-speed performance. This metric system bearing features a back-to-back (DB) matched arrangement with a Moderate (Class C) preload, enabling it to handle combined radial and axial loads simultaneously. Its construction with ceramic balls and phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it ideal for high-reliability, high-precision machinery.
7028 CD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a duplex bearing in a back-to-back (DB) arrangement. |
| HC | Refers to the hybrid ceramic ball material (Silicon Nitride), offering advantages in high-speed and high-temperature applications. |
| P4A | Denotes a very high precision tolerance class, superior to ABEC 7, ensuring minimal runout and vibration. |
| DBC | Specifies the Moderate preload (Class C) applied to the matched set, optimizing rigidity and rotational accuracy. |
7028 CD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a rigid bearing system that effectively resists moment loads and can support significant combined loads. The 15° contact angle is optimized for sustaining substantial axial loads in both directions.
- Superior High-Speed Performance: The combination of hybrid ceramic balls (lower density and reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 6,300 rpm. This setup minimizes heat generation and power loss.
- Precision Operation: Manufactured to P4A tolerance class, this bearing ensures exceptional running accuracy, low noise, and minimal vibration, which is critical for precision spindles.
- Pre-lubricated for Immediate Use: The bearing comes lubricated from the factory, ready for installation and initial operation within its specified temperature range of -30°C to 110°C.
7028 CD/HCP4ADBC Bearing Typical Application Areas
The 7028 CD/HCP4ADBC is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Advanced Robotics: Critical joints and arm linkages requiring high positional accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
