71917 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71917 ACDGA/P4A is a single-row angular contact ball bearing engineered for high-precision applications demanding exceptional rotational accuracy and rigidity. Characterized by its 25° contact angle and P4A super-precision tolerance class, this bearing is optimized to handle significant combined loads—simultaneous radial and axial loads from a single direction. Its extra light preload (Class A) minimizes system deflection, ensuring smooth, quiet operation and enhanced positional accuracy, making it an ideal choice for high-speed spindles and other precision machinery.
71917 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| D | High ball count and optimized internal geometry for increased load capacity. |
| GA | Indicates a specific internal clearance and preload group (Extra Light / Class A). |
| /P4A | Denotes a super-precision tolerance class exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and superior dimensional stability. |
71917 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The combination of a phenolic resin cage, high-grade chrome steel rings and balls, and the P4A tolerance class delivers exceptional system stiffness and running accuracy, critical for minimizing vibration and thermal growth in high-speed applications.
- Superior Load Capacity: The 25° contact angle and optimized internal design enable the bearing to support high combined loads, efficiently managing both radial and substantial one-direction axial forces.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design facilitates efficient lubrication management, allowing for a high limiting speed of 28,000 rpm.
- Universal Matching Capability (SU): This bearing is universally matchable, allowing two bearings to be mounted in a back-to-back (DB) or face-to-face (DF) arrangement without selective assembly, simplifying installation and achieving pre-defined preload and rigidity.
71917 ACDGA/P4A Bearing Typical Application Areas
The 71917 ACDGA/P4A is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and navigation instruments.
