7009 ACD/P4ADGC
7000 Series Super Precision Angular Contact Ball Bearings
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7009 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 7009 ACD/P4ADGC is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial loads in one direction. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other precision machinery. The combination of a phenolic cage, moderate preload (Class C), and factory-applied lubrication delivers outstanding high-speed performance and operational reliability.
7009 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7009 | Basic bearing designation. Bore diameter: 45 mm, Outside diameter: 75 mm, Width: 32 mm. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a Universal Matchable (SU) bearing. Two bearings can be paired in a universal arrangement to handle axial loads in both directions. |
| P4A | Indicates a high-precision tolerance class, exceeding ABEC 7/ISO P4 standards, for superior running accuracy and dimensional stability. |
| DGC | Specifies a Moderate Preload (Class C). This pre-set internal clearance provides optimal stiffness for the bearing pair without generating excessive heat. |
7009 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design and 25° contact angle are optimized to support high combined loads. When mounted as a universally matched pair, the assembly provides exceptional axial and radial rigidity, crucial for minimizing deflection in precision spindles.
- Superior High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction at high rotational speeds, contributing to the high limiting speed of 41,000 rpm. The factory-applied lubrication is selected for a broad temperature range from -30°C to 110°C.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is essential for achieving high surface finishes and machining accuracy.
- Optimized Component Design: The use of 17 high-grade chrome steel balls with a diameter of 9.525 mm ensures a robust load-carrying capacity and smooth operation.
7009 ACD/P4ADGC Bearing Typical Application Areas
The 7009 ACD/P4ADGC is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling heads.
- High-Speed Motors and Spindles: Electric motors, precision spindles, and dental handpieces.
- Precision Instruments: Measuring equipment, optical scanners, and rotary encoders.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and navigation systems.
