S71911 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71911 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S71911 ACD/P4ADBA is a precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and running accuracy. This P4A tolerance class bearing features a 25° contact angle and is preloaded for extra-light conditions, ensuring minimal deflection under complex loads. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously from both directions, making it an ideal choice for high-speed spindles and other precision machinery where stability and precision are paramount.
S71911 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Designates a super-precision bearing series. |
| 7 | Indicates an angular contact ball bearing design. |
| 1911 | Specifies the bearing dimensions: 55mm bore, 80mm OD, 26mm width. |
| ACD | Denotes a duplex back-to-back (DB) arrangement with a 25° contact angle. |
| P4A | Specifies the tolerance class, representing very high running accuracy and dimensional precision. |
| DBA | Indicates a light preload applied to the bearing set. |
S71911 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists overturning moments and can support significant combined loads. This configuration provides excellent operational stability.
Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and is optimized for high-speed operation up to 34,000 rpm. The precision-ground chrome steel components contribute to smooth, quiet running.
Optimized Internal Geometry: With 23 balls of 7.938mm diameter and a 25° contact angle, the bearing is engineered for optimal load distribution and high-speed capability.
Sealed & Pre-lubricated: As a sealed bearing with factory-applied grease lubrication, it offers protection against contamination and is ready for immediate installation, reducing maintenance requirements.
S71911 ACD/P4ADBA Bearing Typical Application Areas
The S71911 ACD/P4ADBA is ideally suited for applications demanding the highest levels of precision and speed, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Rotary Tables and Indexing Heads
- High-Frequency Spindles for PCB drilling and routing
- Medical Equipment (Dental handpieces, surgical tools)
- Aerospace Positioning Systems and Gyroscopes
