7008 ACD/P4ATT
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7008 ACD/P4ATT Bearing Product Overview & Core Advantages
The 7008 ACD/P4ATT is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing features a triplex tandem (3-DT) matched arrangement, providing superior axial load capacity in one direction. Manufactured to P4A tolerance class, it ensures high running accuracy and is pre-loaded for immediate, precise operation. Its robust construction, utilizing chrome steel rings and balls with a phenolic cage, makes it ideal for high-speed and high-rigidity applications where uncompromising performance is critical.
7008 ACD/P4ATT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7008 | Basic bearing series and bearing dimensions (40mm bore, 68mm OD, 45mm width) | Defines the core geometry and size. |
| ACD | Angular Contact Design with a 25° contact angle | Optimized for handling combined loads (radial and axial). |
| P4A | Tolerance class (P4A is a high-precision grade) | Ensures extremely tight dimensional and running accuracy for precision applications. |
| T | Phenolic (Textile) Cage | Facilitates high-speed performance and is suitable for high-temperature operation. |
| T | Lubricated | Comes pre-lubricated for immediate installation and initial operation. |
7008 ACD/P4ATT Bearing Structural Features & Performance Benefits
Triplex Tandem Matched Set: The set of three bearings is matched and pre-loaded, creating an extremely high-rigidity assembly capable of supporting very high axial loads in one direction. This configuration is essential for applications with minimal deflection requirements.
High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 56,000 rpm, making it an excellent high-speed bearing.
Superior Load Capacity: With a radial dynamic load rating of 7762 lbf and a radial static load rating of 6975 lbf, this bearing is engineered to handle significant combined loads.
Precision Performance: The P4A tolerance class and precise bore diameter tolerance ensure minimal runout and vibration, which is critical for the accuracy of the overall system.
7008 ACD/P4ATT Bearing Typical Application Areas
The 7008 ACD/P4ATT is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, indexing tables, and rotary actuators.
- High-Frequency Motors and Spindles: Applications requiring ultra-high rotational speeds.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
