7008 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7008 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7008 CD/HCP4ADBA is a precision angular contact ball bearing configured as a duplex back-to-back (DB) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is preloaded to Extra Light / Class A specifications. Its defining characteristic is the ability to support combined loads—significant radial loads alongside substantial axial loads in both directions—simultaneously. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low heat generation, and extended service life, making it ideal for high-precision, high-rigidity spindles.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 30mm width). |
| C | 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| D | Indicates a duplex (two-bearing) configuration. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity. |
| HC | Refers to the Hybrid Ceramic construction (steel rings with ceramic balls). |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| A | Specifies the Extra Light preload class, minimizing friction and heat at very high speeds. |
7008 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) design creates a preloaded, statically determinate system that offers superior resistance to moment loads and shaft deflection, ensuring exceptional running accuracy and system high rigidity.
Superior High-Speed Performance: The combination of low-density ceramic balls reduces centrifugal forces, while the lightweight phenolic cage provides excellent guidance and stability. This allows the bearing to achieve a very high limiting speed of 41,000 rpm with minimal heat generation.
Extended Service Life & Reliability: Hybrid ceramic construction is less susceptible to wear and is electrically insulating. The bearings are pre-lubricated and come as a precision-matched set, ensuring optimal performance and longevity out-of-the-box.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, guaranteeing consistent, high-precision performance in the most demanding applications.
7008 CD/HCP4ADBA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency CNC Machining Spindles
- Precision Grinding Spindles
- High-Speed Electric Motor Spindles
- Aerospace & Defense Instrumentation
- Semiconductor Manufacturing Equipment
