7008 CD/HCP4ADFA
Hybrid Ceramic Super Precision Bearings
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7008 CD/HCP4ADFA Bearing Product Overview & Core Advantages
The 7008 CD/HCP4ADFA is a precision duplex angular contact ball bearing set, engineered for applications demanding exceptional rotational accuracy and rigidity. This metric bearing features a Face-to-Face (DF) matched arrangement and an Extra Light (Class A) preload, making it ideal for high-speed spindles and other precision machinery. Its core advantages include superior running accuracy, high system rigidity, and the ability to handle combined loads from multiple directions simultaneously, ensuring reliable performance in the most demanding operational environments.
7008 CD/HCP4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| C | 15° contact angle, optimized for high-speed operation and moderate axial loads. |
| D | Indicates a duplex pair (two bearings). |
| HC | Hybrid Ceramic: Features ceramic balls for reduced friction, lower heat generation, and longer service life. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| DF | Duplex Face-to-Face arrangement. This configuration provides high rigidity and is tolerant to misalignment. |
| A | Specifies Extra Light preload, which minimizes friction at high speeds while maintaining shaft positioning. |
7008 CD/HCP4ADFA Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its advanced material selection and precision engineering:
- High Rigidity & Load Capacity: The duplex DF arrangement creates a highly rigid bearing system capable of withstanding significant combined radial and axial loads from both directions.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a high limiting speed of 41,000 rpm. The 15° contact angle is specifically chosen for optimal high-speed operation.
- Enhanced Durability and Precision: Manufactured to a P4A tolerance class, this bearing guarantees exceptional running accuracy. The open seal design, combined with factory lubrication, is intended for systems where controlled, clean lubrication is provided externally.
- Pre-Configured Performance: The bearings are supplied as a matched set with a defined preload, eliminating complex installation calculations and ensuring immediate, optimal performance.
7008 CD/HCP4ADFA Bearing Typical Application Areas
The 7008 CD/HCP4ADFA is designed for high-performance applications where speed, precision, and rigidity are critical. 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 and laboratory centrifuges.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
- High-Frequency Spindles for PCB drilling and semiconductor manufacturing.
