7008 ACDGD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 ACDGD/P4A
Basic Information
System of measurement
Metric
Weight
0.19 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
15 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2340 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7008 ACDGD/P4A Bearing Product Overview & Core Advantages
The 7008 ACDGD/P4A is a single row angular contact ball bearing designed for applications demanding high precision and extreme rigidity. Engineered with a 25° contact angle and a Heavy preload (Class D), it excels at handling significant combined loads (radial and axial) in one direction. Its P4A tolerance class ensures exceptional running accuracy, making it ideal for high-speed spindles and precision machinery where uncompromising performance is critical.
7008 ACDGD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGD | Heavy Preload (Class D). This increases bearing rigidity and minimizes axial/radial deflection under load. |
| P4A | High-Precision Tolerance Class, providing superior dimensional and running accuracy over standard bearings. |
7008 ACDGD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The combination of a 25° contact angle and a Heavy preload provides maximum stiffness, enabling the bearing to withstand high combined loads with minimal deformation. This is critical for maintaining precision in demanding applications.
- Precision Performance: Manufactured to P4A tolerance standards, this bearing guarantees exceptional running accuracy, low vibration, and consistent performance at high speeds.
- Optimized High-Speed Operation: The lightweight, durable phenolic cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 56,000 rpm.
- Universal Matching Capability (SU): This bearing is Universal Matchable, allowing for precise arrangement in sets (typically 3 bearings) to achieve specific preload and rigidity requirements without selective mounting.
- Superior Material Construction: Made from chrome steel for both rings and balls, it offers high fatigue life and durability under heavy loads.
7008 ACDGD/P4A Bearing Typical Application Areas
This bearing is specifically engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, high-frequency motor spindles.
- Robotics: High-accuracy robotic arm joints and gears.
- Axial Compressors & Pumps: Applications requiring robust handling of significant axial thrust loads.
