7209 ACDGC/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7209 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7209 ACDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it excels at supporting combined loads, particularly high axial loads in one direction. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and precision machinery. This bearing is pre-lubricated and features a phenolic resin cage for reduced friction and superior high-speed performance.
7209 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Standard bore diameter (45 mm) and dimension series. |
| AC | Angular Contact design with a 25° contact angle. |
| DGC | Moderate preload (Class C). This pre-set internal load enhances bearing rigidity and minimizes axial play under operational conditions. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, which guarantees extremely tight dimensional and running accuracy for superior performance. |
7209 ACDGC/P4A Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 25° contact angle and precision-ground raceways are engineered to handle significant axial loads while maintaining excellent radial load capacity.
High-Speed Phenolic Cage: The lightweight and robust phenolic resin cage ensures stability and low friction at the bearing's high limiting speed of 41,000 rpm, reducing heat generation and wear.
Superior Rigidity: The application of a moderate preload (C) significantly increases system stiffness, which is critical for minimizing deflection in high-precision applications like machine tool spindles.
Precision Materials: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers high fatigue life and durability under demanding operating conditions.
7209 ACDGC/P4A Bearing Typical Application Areas
The 7209 ACDGC/P4A is specified 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 high-accuracy rotary axes.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are required.
- Medical and Dental Equipment: High-speed handpieces and imaging scanners.
