7008 CDGC/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7008 CDGC/P4A Bearing Product Overview & Core Advantages
The 7008 CDGC/P4A is a single-row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. Positioned in the ultra-precision P4A tolerance class, it is designed to handle combined loads—significant radial loads alongside substantial unidirectional axial loads. Its 15° contact angle and universal matchable (SU) design allow for flexible mounting in preloaded duplex arrangements, enabling optimal system stiffness and performance. The bearing is pre-lubricated and features a lightweight phenolic cage, contributing to its high limiting speed of 43,000 rpm, making it an ideal solution for high-speed, high-precision machinery.
7008 CDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing designation, indicating a metric series angular contact ball bearing with a 40mm bore, 68mm OD, and 15mm width. |
| CD | Specifies a 15° contact angle and is designed for universal matching (DU or DF arrangements). |
| GC | Indicates a moderate preload (Class C), providing a balance between rigidity and operational smoothness. |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy, tighter dimensional tolerances, and superior rotational characteristics. |
7008 CDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The single-row design with a 15° contact angle is optimized to support significant combined radial and axial loads. When mounted in a preloaded universal match (SU) set, the system achieves exceptionally high rigidity, minimizing deflection under load.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces and ensures stable operation at the high limiting speed of 43,000 rpm. The optimized internal geometry minimizes friction and heat generation.
- Precision Engineering: Manufactured to P4A tolerance standards, this bearing guarantees minimal runout and superior dimensional stability, which is critical for applications requiring extreme positional accuracy.
- Universal Matching Capability: The Universal Matchable (SU) feature allows bearings to be supplied in sets (typically 3 bearings) that can be flexibly assembled in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations to meet specific application requirements for preload and stiffness.
7008 CDGC/P4A Bearing Typical Application Areas
The 7008 CDGC/P4A is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high accuracy and moment load capacity.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small precision motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: Centrifuges and high-speed laboratory apparatus.
