S71917 ACDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71917 ACDGA/P4A Bearing Product Overview & Core Advantages
The S71917 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and high-speed performance. As a single bearing with a 25° contact angle and Extra Light (Class A) preload, it delivers exceptional running accuracy and rigidity. Its P4A tolerance class ensures minimal dimensional variation, making it ideal for high-reliability spindles and precision machinery where controlling axial and radial displacement is critical.
S71917 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71917 | Basic bearing designation, indicating a super-precision angular contact ball bearing series. |
| AC | Angular Contact design with a 25° contact angle. |
| D | High internal geometry and dimensional accuracy. |
| GA | Indicates Universal Matchable (SU) bearings supplied in a set of 4 for precise preload control when mounted in pairs. |
| P4A | The tolerance class denoting extremely tight dimensional and running accuracy, superior to ABEC 7/ISO P4. |
S71917 ACDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability & Stability: The phenolic resin cage and optimized internal design contribute to low friction and heat generation, enabling a high limiting speed of 28,000 rpm. The 25° contact angle provides an excellent balance between radial load capacity and axial stiffness.
Exceptional Rigidity and Accuracy: The Extra Light preload (Class A) eliminates internal clearance, resulting in significantly improved shaft guidance and dynamic stiffness, which is crucial for minimizing deflection under load in precision applications.
Precision Engineering: Manufactured to P4A tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, this bearing ensures predictable and consistent performance. The use of high-grade chrome steel for rings and balls guarantees durability and long service life.
Universal Matching: Designated as Universal Matchable (SU), these bearings can be mounted in any combination (back-to-back, face-to-face, or tandem) without a loss in preload accuracy, offering maximum flexibility in spindle design.
S71917 ACDGA/P4A Bearing Typical Application Areas
The S71917 ACDGA/P4A is engineered for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles.
- High-Frequency Motors: Spindles for PCB drilling and high-speed routers.
- Precision Instrumentation: Measuring equipment and laboratory apparatus.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical rotating assemblies.
