7008 CE/HCP4ALQBCA
Hybrid Ceramic Super Precision Bearings
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7008 CE/HCP4ALQBCA Bearing Product Overview & Core Advantages
The 7008 CE/HCP4ALQBCA is a high-precision quadruplex matched angular contact ball bearing designed for the most demanding applications. This ceramic hybrid bearing features a back-to-back arrangement of four bearings, delivering exceptional system rigidity and the ability to handle complex combined loads (radial and axial). Its P4A super-precision tolerance and phenolic cage ensure outstanding running accuracy and stability, making it ideal for high-speed spindles requiring maximum performance and reliability.
7008 CE/HCP4ALQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| CE | Hybrid bearing with Ceramic balls (Silicon Nitride) and steel rings. |
| HC | High-Capacity internal geometry for increased load rating. |
| P4A | Super-precision tolerance class (exceeding ABEC 7/ISO P4), ensuring minimal runout and vibration. |
| L | Light preload applied to the bearing set. |
| QBC | Quadruplex Back-to-Back arrangement of four matched bearings. |
7008 CE/HCP4ALQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex back-to-back (QBC) matched arrangement creates an extremely stiff bearing system, capable of withstanding heavy combined radial and axial loads and resisting moment loads. The 15° contact angle is optimized for high axial stiffness.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers operating temperatures and friction, enabling a high limiting speed of 56,000 rpm.
- Precision & Long Service Life: Manufactured to P4A super-precision standards, this bearing ensures minimal vibration and superior running accuracy. The ceramic hybrid design provides excellent wear resistance and a longer operational life, especially in contaminated or poorly lubricated environments.
- Thermal Stability: The phenolic cage and ceramic balls contribute to stable performance across the specified temperature range of -30°C to 110°C.
7008 CE/HCP4ALQBCA Bearing Typical Application Areas
This high-performance bearing set is engineered for advanced machinery where ultimate precision, speed, and rigidity are non-negotiable. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, drilling)
- Precision Grinding Spindles
- High-Speed Motors and Electro-Spindles
- Aerospace & Defense Instrumentation
- Semiconductor Manufacturing Equipment
