7008 ACD/P4ADBC
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/P4ADBC Bearing Product Overview & Core Advantages
The 7008 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and rotational accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate Class C, providing superior stability and resistance to complex combined loads, including significant radial and axial forces in both directions. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and is ideal for high-speed, high-precision machinery where reliability is paramount.
7008 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Standard bearing series designation, indicating bearing dimensions (40mm bore, 68mm OD, 30mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings in a set). |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| DBC | Specific factory code for the Back-to-Back (DB) arrangement with Moderate (Class C) preload. |
7008 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back configuration creates a wide, rigid support system that effectively counters moment loads and shaft deflection, making it exceptionally high rigid.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing is engineered to handle significant combined radial and axial loads simultaneously from both directions.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 56,000 rpm. The bearings are pre-lubricated for immediate operation.
Precision Engineering: The P4A tolerance class and tight dimensional controls on bore, outside diameter, and width ensure precise fitment and smooth, quiet operation in demanding applications.
7008 ACD/P4ADBC Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes and Transmission Systems
- High-frequency Spindles for PCB drilling and routing
- Robotic Arm Joints and Precision Rotary Axes
- Advanced Medical and Laboratory Equipment
