7208 ACD/P4ADGC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 7208 ACD/P4ADGC is a precision double row angular contact ball bearing engineered for applications demanding exceptional rigidity and running accuracy. This P4A tolerance class bearing is designed to accommodate combined loads—simultaneous radial and axial loads—from both directions, making it an ideal choice for high-precision spindles and machinery. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs without requiring selective shimming, simplifying installation and ensuring optimal preload. The phenolic cage and precision-ground components contribute to its superior high-speed performance and smooth operation.
7208 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series, indicating a 40mm bore, 80mm OD, and 36mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Double row construction for high rigidity and load capacity. |
| P4A | High precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DGC | Indicates a universal matchable (SU) bearing pair with a moderate preload (Class C). |
7208 ACD/P4ADGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row angular contact design provides superior radial and axial stiffness, enabling the bearing to handle significant combined loads with high stability. The optimized 25° contact angle effectively manages thrust loads from both directions.
Precision & High-Speed Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal runout and vibration. The lightweight phenolic cage ensures excellent dimensional stability and low friction, contributing to a high limiting speed of 41,000 rpm. The 14 high-precision chrome steel balls are precisely sized and arranged for smooth, quiet operation.
Universal Matching & Simplified Assembly: As a Universal Matchable (SU) bearing, any two 7208 ACD/P4ADGC bearings can be mounted together in various configurations (back-to-back, face-to-face, or tandem) to achieve the required system rigidity without the need for selective matching, drastically reducing assembly time and complexity.
7208 ACD/P4ADGC Bearing Typical Application Areas
The 7208 ACD/P4ADGC is specified for high-performance applications where precision, speed, and rigidity are critical. Key industries and machinery include:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling heads.
- Precision Instrumentation: Used in measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors & Spindles: Ideal for electric motor spindles and high-speed drives.
- Robotics: Applied in robotic arm joints and precision reducers requiring high positional accuracy.
