7008 CDGA/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 CDGA/P4A Bearing Product Overview & Core Advantages
The 7008 CDGA/P4A is a single row angular contact ball bearing designed for ultra-high precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 15° contact angle provides optimal performance for combined loads, particularly where high axial load capacity is required in one direction. The phenolic resin cage and precision-ground chrome steel components enable high-speed operation up to 43,000 rpm, making it ideal for demanding applications where precision and reliability are critical.
7008 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
| 7008 | Basic bearing designation (40mm bore, 68mm OD) | Standard metric dimensions |
| CDGA | Universal matching bearing with extra light preload (Class A) | Enables precise bearing arrangement with minimal deflection |
| P4A | Ultra-precision tolerance class | Exceptional running accuracy and dimensional stability |
7008 CDGA/P4A Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and consistent performance.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling stable operation at limiting speeds of 43,000 rpm.
Optimized Load Distribution: With 18 precision balls of 7.938mm diameter and a 15° contact angle, the bearing efficiently handles combined radial and axial loads while maintaining high rigidity.
Universal Matching Design: The CDGA designation indicates the bearing is universally matchable, allowing for precise preload control when used in sets of three bearings for optimal system performance.
Premium Material Construction: Chrome steel rings and balls provide excellent wear resistance and durability, while the phenolic cage ensures reliable operation across the temperature range of -30°C to 110°C.
7008 CDGA/P4A Bearing Typical Application Areas
Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines requiring exceptional accuracy and rigidity.
Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus where minimal runout and vibration are critical.
High-Speed Rotary Systems: Dental handpieces, small turbines, and precision motors operating at elevated speeds.
Aerospace Components: Guidance systems, gyroscopes, and other precision mechanisms requiring reliable performance under demanding conditions.
Semiconductor Manufacturing: Wafer handling equipment, precision positioning stages, and other cleanroom applications where contamination control is essential.
