7008 CD/P4ADGB
7000 Series Super Precision Angular Contact Ball Bearings
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7008 CD/P4ADGB Bearing Product Overview & Core Advantages
The 7008 CD/P4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to accommodate combined loads (simultaneous radial and axial loads), its universal matchable (SU) design allows for flexible mounting arrangements in preloaded sets. Manufactured to a P4A tolerance class, it guarantees superior running accuracy, making it an ideal solution for high-speed spindles and other precision machinery where high rigidity and minimal runout are critical.
7008 CD/P4ADGB 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 | Specifies a 15° contact angle and indicates the bearing is part of a universally matchable (SU) pair for duplex mounting. |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy requirements beyond standard P4. |
| DGB | Indicates a light preload (Class B) is applied, optimizing bearing stiffness and minimizing axial/radial play for superior performance. |
7008 CD/P4ADGB Bearing Structural Features & Performance Benefits
Optimized Internal Geometry & Material Selection: The bearing features a 15° contact angle and is manufactured from high-grade chrome steel for both rings and balls, ensuring high load capacity and durability. The phenolic cage contributes to smooth operation at high speeds, low friction, and is suitable for the specified temperature range.
High Rigidity & Load Capacity: The angular contact design is inherently rigid, effectively handling combined loads. The application of a light preload (DGB) further enhances system stiffness, reduces deflection under load, and improves positional accuracy.
Precision & Speed Performance: Built to P4A tolerance class, this bearing ensures extremely tight dimensional and running accuracy, which is critical for applications like machine tool spindles. This precision, combined with the optimized design, supports a high limiting speed of 43,000 rpm.
Flexible Mounting & Application Readiness: The Universal Matchable (SU) designation means two identical 7008 CD/P4ADGB bearings can be paired in various arrangements (back-to-back, face-to-face, or tandem) to meet specific application requirements for rigidity and moment load capacity.
7008 CD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Grinding Spindles: Applications where minimal runout and high rotational accuracy are paramount.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motor applications.
- Robotic Arm Joints & Precision Gearboxes: Where accurate motion control and high stiffness are needed.
