7008 CD/P4ADFB
7000 Series Super Precision Angular Contact Ball Bearings
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7008 CD/P4ADFB Bearing Product Overview & Core Advantages
The **7008 CD/P4ADFB** is a **precision angular contact ball bearing** designed for demanding applications requiring exceptional rotational accuracy and rigidity. This **duplex bearing** features a **face-to-face (DF) arrangement** with **light preload (Class B)**, delivering optimized performance under **combined radial and axial loads**. Manufactured to **P4A tolerance class**, it ensures minimal runout and vibration for superior operational smoothness. The phenolic resin cage and chrome steel construction contribute to its **high-speed capability** and long service life in precision machinery.
7008 CD/P4ADFB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 30mm width) |
| CD | Duplex face-to-face (DF) arrangement with specific internal clearance and preload |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DFB | Universal matching bearing set, ready for installation without additional selection |
7008 CD/P4ADFB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex face-to-face configuration creates a rigid bearing system that effectively handles combined loads from multiple directions. The 15° contact angle provides excellent axial load capacity while maintaining good radial performance.
Precision Performance: Manufactured to P4A tolerance standards with tight dimensional controls (bore tolerance: -0.004mm to 0), this bearing ensures minimal vibration and precise rotational characteristics essential for high-accuracy applications.
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at limiting speeds up to 43,000 rpm. The lightweight construction reduces centrifugal forces, enhancing high-speed performance.
Optimized Thermal Stability: The face-to-face arrangement provides good thermal stability during operation, maintaining precision under varying temperature conditions within the specified temperature range of -30°C to 110°C.
7008 CD/P4ADFB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional accuracy and rigidity
- Precision Gearboxes: Industrial transmission systems demanding minimal backlash and high positional accuracy
- High-Speed Machining Centers: Applications where rotational precision and speed capability are critical
- Robotic Arms & Automation: Joint and pivot points requiring precise motion control and load handling
- Medical Equipment: High-speed dental handpieces and precision medical instruments
- Aerospace Components: Guidance systems and auxiliary power units requiring reliable performance under demanding conditions
