7008 ACE/HCDTVQ126
Hybrid Ceramic Super Precision Bearings
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7008 ACE/HCDTVQ126 Bearing Product Overview & Core Advantages
The 7008 ACE/HCDTVQ126 is a precision angular contact ball bearing designed for demanding applications requiring exceptional performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A super-precision tolerance, ensuring high running accuracy and system rigidity. Its key advantage lies in its ability to handle high combined loads while operating at very high speeds, making it ideal for ultra-precise, high-reliability machinery. The use of ceramic balls and a phenolic cage further enhances its high-speed capability and reduces rotational mass.
7008 ACE/HCDTVQ126 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7008 | Basic bearing series and size designation | Indicates a 40mm bore, 68mm OD, and 30mm width. |
| ACE | Internal design code | Specifies optimized internal geometry, likely including the 25° contact angle. |
| HC | Hybrid Ceramic | Denotes the use of ceramic (silicon nitride) balls, offering lower density, higher stiffness, and electrical insulation. |
| DT | Duplex Tandem | Indicates a preloaded set of two bearings mounted in tandem to share the load and increase axial rigidity. |
| VQ | Vibration Qualification / Special Precision | Signifies enhanced manufacturing controls for lower vibration and noise levels. |
| 126 | Internal code for preload level | Specifies the precise amount of preload applied to the bearing set for optimal stiffness. |
7008 ACE/HCDTVQ126 Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex tandem arrangement and built-in preload create an exceptionally rigid bearing system, capable of withstanding high combined radial and axial loads in one direction. This configuration minimizes deflection under load, critical for maintaining precision.
Superior High-Speed Performance: The combination of ceramic balls (lower density reduces centrifugal forces) and a lightweight phenolic resin cage allows for a very high limiting speed of 56,000 rpm. This design reduces friction, heat generation, and improves dynamic response.
Precision and Longevity: Manufactured to ABEC 7 / P4A tolerance class with tight dimensional control on all bearing dimensions, this bearing ensures high running accuracy and consistent performance. The open design, when used with a proper lubrication system, allows for efficient heat dissipation and long service life.
7008 ACE/HCDTVQ126 Bearing Typical Application Areas
This high-performance bearing set is engineered for the most demanding applications, including:
- High-Speed Machine Tool Spindles: For CNC milling, grinding, and drilling centers requiring high rigidity and precision at extreme speeds.
- Precision Robotics: In high-accuracy robotic arms and joints where minimal deflection and high responsiveness are critical.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical rotating assemblies.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and other applications where maximum rotational velocity is a key requirement.
