7009 CD/P4ADBC
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 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7009 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Moderate / Class C specifications, delivering superior system stability and resistance to complex combined loads. Manufactured to an ultra-precise P4A tolerance class, it is engineered for high-performance scenarios where high rigidity and minimal runout are critical. The open design allows for customized lubrication schemes to optimize performance.
7009 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 7009: Basic series designation, indicating a 45 mm bore and 75 mm outside diameter.
- C: Denotes a 15° contact angle, optimized for handling significant axial loads.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies the tolerance class, representing very high precision for dimensional and running accuracy.
- DB: Defines the matched arrangement as Back-to-Back. This configuration provides high moment rigidity and is ideal for supporting overturning moments.
- C: Specifies the preload level as Moderate (Class C), which increases bearing stiffness and controls axial and radial play.
7009 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness. This enables the bearing set to effectively handle combined radial and axial loads from both directions. The 15° contact angle is specifically chosen to provide an excellent balance between radial and axial load capacity.
Precision & High-Speed Performance: Built to P4A tolerance class, this bearing ensures minimal runout and vibration for ultra-smooth operation. The lightweight phenolic resin cage contributes to lower centrifugal forces, reducing friction and heat generation, which is essential for achieving the high limiting speed of 46,000 rpm.
Material & Construction: Components made from high-grade chrome steel provide excellent durability and fatigue life. The set comes pre-lubricated from the factory, ensuring immediate operational readiness and protection during the initial run-in period.
7009 CD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindles.
- Medical Equipment such as dental handpieces and imaging scanners.
- Aerospace Actuation Systems and instrumentation.
