S71913 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71913 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S71913 ACD/P4ADBA is a precision duplex pair of double row angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This preloaded back-to-back (DB) arrangement is manufactured to the stringent P4A tolerance class, ensuring minimal runout and superior performance. Its core advantages include the ability to handle combined loads (radial and axial loads simultaneously) and provide high system rigidity, making it ideal for high-speed, high-precision spindles and machinery.
Model Code In-Depth Analysis
| Suffix Code | Technical Meaning |
|---|---|
| S7 | Designates a high-precision angular contact bearing series. |
| 1913 | Specifies the bore diameter (65 mm), outside diameter (90 mm), and width (26 mm). |
| ACD | Indicates a 25° contact angle and a duplex back-to-back (DB) matched set. |
| P4A | Specifies the tolerance class, denoting very high running accuracy (superior to ABEC 7). |
| DB | Confirms the back-to-back mounting of the two bearings in the set. |
| A | Indicates an Extra Light preload for minimal friction and optimal high-speed operation. |
S71913 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists overturning moments, ensuring exceptional shaft positioning accuracy and stability under heavy combined loads.
Superior Load Capacity: With a 25° contact angle and a double row design, this bearing is engineered to sustain significant radial loads and bidirectional axial loads simultaneously, offering robust performance in demanding applications.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 31,000 rpm. The P4A precision and extra light preload further ensure smooth, low-vibration operation at high rotational velocities.
Sealed and Lubricated for Life: As a sealed bearing, it is pre-lubricated with grease, protecting against contamination and providing maintenance-free operation throughout its service life within the specified temperature range.
S71913 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Instrumentation: High-accuracy measuring devices and scientific equipment.
- High-Frequency Motors and Spindles: Applications where low vibration and high rotational accuracy are critical.
- Robotics and Automation: Precision joints and arms demanding high stiffness and repeatability.
