7209 ACD/P4ADFA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7209 ACD/P4ADFA Bearing Product Overview & Core Advantages
The 7209 ACD/P4ADFA is a precision duplex angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. This matched set features a Face-to-Face (DF) arrangement and an Extra Light (A) preload, making it ideal for handling combined radial and axial loads from both directions simultaneously. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, high system stiffness, and reliable performance in high-speed, high-precision machinery.
7209 ACD/P4ADFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7209 | Basic bearing series and size code (45mm bore, 85mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex (Two bearings in a matched set) |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| DF | Face-to-Face arrangement for moment load capacity |
| A | Extra Light preload for optimal rigidity and minimal friction |
7209 ACD/P4ADFA Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex DF arrangement and preload create a highly rigid bearing system that minimizes axial and radial deflection under load, ensuring precise shaft positioning and reduced vibration.
- Superior Load Capacity: The 25° contact angle and duplex design enable the bearing to support significant combined radial and axial loads from both directions, making it suitable for complex loading conditions.
- Precision High-Speed Performance: Built to P4A tolerance standards with a lightweight phenolic cage, this bearing ensures smooth operation, low heat generation, and a high limiting speed of 41,000 rpm.
- Optimized Material Selection: Components made from chrome steel provide high hardness and durability, while the phenolic cage offers strength and minimal friction at high speeds.
7209 ACD/P4ADFA Bearing Typical Application Areas
This high-precision duplex bearing is engineered for demanding applications where accuracy, speed, and rigidity are critical. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Transmission Systems
- High-Frequency Motors and Spindles
- Medical and Laboratory Equipment: Centrifuges and precision scanners.
- Robotics and Automation: High-accuracy rotary joints and arms.
