71917 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71917 ACD/P4ATBTC is a precision angular contact ball bearing supplied as a matched triplex set in a Back-to-Back (TBT) arrangement. Engineered to the exacting P4A tolerance class, this bearing is designed for applications demanding exceptional rotational accuracy, high system rigidity, and the ability to handle significant combined loads (radial and axial). The pre-matched set ensures optimized load distribution and simplifies installation, providing a reliable, high-performance solution for the most demanding machinery.
71917 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71917 AC | Bearing series with a 25° contact angle. | Optimized for carrying high axial loads in one direction, as well as combined loads. |
| D | Moderate preload (Class C). | Enhances system rigidity and minimizes deflection under load for improved positional accuracy. |
| P4A | High-Precision Tolerance Class. | Guarantees extremely tight dimensional and running accuracy for applications like high-speed spindles. |
| TBT | Triplex Back-to-Back matched set. | Three bearings are supplied as a pre-matched unit in a back-to-back configuration, offering maximum moment stiffness and stability. |
| C | Phenolic Cage. | Provides high strength, low weight, and excellent performance in high-speed applications with minimal friction. |
71917 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
Superior Rigidity and Load Capacity: The triplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding high moment loads and complex combined loads. The 25° contact angle is ideal for applications with substantial axial loads.
High-Speed Capability: The lightweight and robust phenolic cage (C) is engineered for stability at high rotational speeds, contributing to the bearing's limiting speed of 28,000 rpm. The open design allows for efficient lubrication management.
Precision Performance: Manufactured to P4A tolerance class with very tight bore and outside diameter tolerances, this bearing ensures minimal runout and vibration, which is critical for maintaining precision in machining and positioning.
Optimized Internal Geometry: With 25 high-precision chrome steel balls, the bearing is designed for smooth operation, reduced heat generation, and a long service life under demanding conditions.
71917 ACD/P4ATBTC Bearing Typical Application Areas
The 71917 ACD/P4ATBTC is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instruments.
- High-Frequency Motors and Spindles: Where low vibration and high running accuracy are required.
