7008 ACD/P4ADT
7000 Series Super Precision Angular Contact Ball Bearings
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7008 ACD/P4ADT Bearing Product Overview & Core Advantages
The 7008 ACD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This bearing features a duplex tandem (DT) arrangement, where two bearings are preloaded and matched to work in unison, significantly enhancing axial rigidity and load-carrying capacity. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and precision machinery. The combination of a phenolic cage and optimized 25° contact angle delivers superior high-speed performance and the ability to handle significant combined loads.
7008 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Tandem (DT) preloaded arrangement. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards. |
| DT | Specifies a matched set of two bearings in a Duplex Tandem configuration. |
7008 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement provides exceptional axial stiffness, allowing the bearing set to withstand heavy combined loads (radial and axial) in one direction. This is critical for applications requiring minimal shaft deflection.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 25° contact angle is optimized for high-speed operation, enabling a limiting speed of 56,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, resulting in smooth operation, reduced vibration, and enhanced machine tool finish.
- Optimized Internal Geometry: With 18 high-grade chrome steel balls of 7.938mm diameter, the bearing achieves an optimal balance between load distribution and high-speed capability.
7008 ACD/P4ADT Bearing Typical Application Areas
The 7008 ACD/P4ADT is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: CNC indexing heads, rotary tables, and robotic arms.
- High-Frequency Motors & Spindles: Where minimal runout and high rotational accuracy are required.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other precision instrumentation.
