S71911 ACB/P4ADT
Sealed Super Precision Angular Contact Ball Bearings
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S71911 ACB/P4ADT Bearing Product Overview & Core Advantages
The S71911 ACB/P4ADT is a precision duplex tandem angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. This matched bearing set excels at simultaneously handling combined radial and axial loads, providing exceptional rotational accuracy and system stability. Its P4A tolerance class and optimized internal geometry ensure superior performance in precision machinery, making it an ideal choice for applications requiring maximum rigidity and minimal runout.
S71911 ACB/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Designates a super-precision bearing series. |
| 71911 | Basic bearing designation (55mm bore, 80mm OD, 26mm width). |
| ACB | Indicates a 25° contact angle, optimized for high axial load capacity and rigidity. |
| P4A | Specifies the tolerance class, denoting very high running accuracy for spindle applications. |
| DT | Signifies the Duplex Tandem arrangement, where two bearings are matched to share axial loads in the same direction, increasing axial rigidity. |
S71911 ACB/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle create an exceptionally rigid system capable of withstanding heavy combined loads. This configuration is specifically designed to handle significant thrust loads in one direction while supporting radial loads.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 34,000 rpm. This makes the bearing suitable for very high-speed spindle applications.
Precision & Longevity: Manufactured to P4A tolerance class with a preload applied, this bearing set ensures minimal vibration and precise running accuracy. The sealed design retains factory-applied grease lubrication, protecting against contamination and providing reliable operation within the specified temperature range of -30°C to 110°C.
S71911 ACB/P4ADT Bearing Typical Application Areas
This precision duplex tandem bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Drives: High-frequency motor spindles and servo drives.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
