S7009 CD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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S7009 CD/P4ADBA Bearing Product Overview & Core Advantages
The S7009 CD/P4ADBA is a precision duplex pair of metric angular contact ball bearings designed for applications demanding the highest levels of accuracy and rigidity. This matched Back-to-Back (DB) arrangement is preloaded to Extra light / Class A specifications, ensuring exceptional running accuracy and minimal axial and radial runout. Its primary advantage lies in its ability to handle combined loads (simultaneous radial and axial loads) with high stability, making it ideal for high-speed, high-precision spindles and machinery where rigidity and thermal stability are critical. The sealed construction and pre-lubrication contribute to long service life with minimal maintenance.
S7009 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- S7009: Basic series designation for a high-precision angular contact ball bearing with a 45mm bore and 75mm outside diameter.
- C: Indicates a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Denotes that the bearing is part of a Duplex pair (two bearings mounted together).
- P4A: Specifies the tolerance class, exceeding ABEC 7/ISO P4 standards, indicating ultra-high precision for dimensions and running accuracy.
- DB: Defines the matched arrangement as Back-to-Back. This configuration provides high moment rigidity and excellent stability under complex loads.
- A: Indicates the specific preload level, in this case, Extra light (Class A), which minimizes friction and heat generation at very high speeds.
S7009 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex Back-to-Back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise rotational alignment.
Superior Load Capacity: The angular contact design with a 15° contact angle enables the bearing to support significant combined radial and axial loads simultaneously. The dynamic and static load ratings of 10,530 lbf and 10,125 lbf, respectively, confirm its robust performance.
Optimized High-Speed Performance: The combination of the phenolic resin cage (lightweight for reduced centrifugal forces), the 15° contact angle, and the Extra light preload allows for a high limiting speed of 46,000 rpm, making it suitable for demanding spindle applications.
Precision & Reliability: Manufactured to a P4A tolerance class with strict dimensional control on the bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and consistent performance.
Sealed & Pre-Lubricated: The integrated seals protect against contamination, and the factory-applied grease lubrication within the specified temperature range ensures immediate operation and long-term reliability.
S7009 CD/P4ADBA Bearing Typical Application Areas
The S7009 CD/P4ADBA is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors: Spindles for PCB drilling and routing.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
