7009 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7009 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7009 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back arrangement (DB) provides superior stability when handling combined radial and axial loads. Manufactured to P4A tolerance class, it delivers ultra-precise running characteristics, making it ideal for high-speed spindles and other demanding machinery where minimal runout and high system rigidity are critical.
7009 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7009 | Basic bearing designation (45mm bore, 75mm OD, 32mm width) |
| A | 30° contact angle (standard for this series) |
| C | Enhanced internal design for improved performance |
| D | Duplex (two bearings supplied as a matched set) |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Back-to-Back mounting arrangement |
7009 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a wide effective spread between load centers, significantly increasing moment stiffness and providing excellent stability under combined loads. This arrangement is particularly effective for applications with overturning moments.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and precise rotational accuracy. The 25° contact angle optimizes the balance between radial and axial load capacity.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 41,000 rpm. The open design facilitates efficient lubrication management.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high hardness, wear resistance, and long service life under demanding operating conditions.
7009 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers
- High-Speed Machining Centers: Where rotational accuracy and rigidity are paramount
- Precision Gearboxes: Industrial transmission systems requiring minimal backlash
- Robotic Systems: Precision joints and rotary actuators
- Medical Equipment: High-speed dental handpieces and surgical tools
- Aerospace Components: Guidance systems and auxiliary power units
