7008 ACDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7008 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7008 ACDGB/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to accommodate combined loads (simultaneous radial and axial loads), this single bearing features a 25° contact angle for optimal axial load capacity. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and vibration are critical.
7008 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series, indicating a 40mm bore, 68mm OD, and 15mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| DGB | Universal Matchable (SU) bearing, pre-ground for light preload (Class B) when mounted in a matched set. |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
7008 ACDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design and phenolic cage provide high rigidity, enabling the bearing to handle significant combined loads with stability.
High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 56,000 rpm, making it suitable for demanding high-speed applications.
Precision Engineering: Manufactured to P4A tolerances with a universal match designation, these bearings can be mounted in sets (typically 3 bearings) to achieve precise preload and maximum system stiffness without selective sorting.
Material Quality: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
7008 ACDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers.
- High-Speed Machining Centers: Applications requiring extreme rotational accuracy and speed.
- Precision Instrumentation: Medical devices, optical scanners, and coordinate measuring machines.
- Robotics: High-accuracy robotic arm joints and spindle drives.
