7217 ACDGC/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7217 ACDGC/P4A Bearing Product Overview & Core Advantages
The 7217 ACDGC/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and exceptional rotational accuracy. Operating under a Moderate (Class C) preload, this bearing delivers superior rigidity and minimizes axial and radial runout, making it ideal for high-speed spindles and precision machinery. Its 25° contact angle is optimized to handle significant combined loads (radial and axial) simultaneously. Manufactured to the stringent P4A tolerance class, it guarantees ultra-precise dimensions and running accuracy for the most demanding applications.
7217 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7217 | Basic Bearing Series & Size | Indicates a metric series bearing with 85mm bore, 150mm OD, and 28mm width. |
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| DGC | Contact Angle & Cage Material | Signifies a 25° contact angle and a phenolic resin cage, which is lightweight and suitable for high-speed operation. |
| P4A | Tolerance Class | Denotes an ultra-high-precision grade with extremely tight tolerances on bore, outside diameter, and width for superior running accuracy. |
7217 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The Moderate (Class C) preload eliminates internal clearance, resulting in a stiff bearing system that is critical for applications requiring high positional accuracy and minimal deflection under load.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the optimized internal geometry and 25° contact angle contribute to stable operation at the high limiting speed of 17,000 rpm.
- Excellent Load Capacity: With a dynamic load rating of 21,510 lbf and a static load rating of 19,125 lbf, this bearing is engineered to handle demanding combined loads.
- Universal Matching Design (SU): This bearing is Universal Matchable, allowing multiple bearings to be mounted together in a set (typically 3) to achieve specific preload or stiffness requirements without selective assembly.
7217 ACDGC/P4A Bearing Typical Application Areas
The 7217 ACDGC/P4A is specified for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: For CNC machining centers, grinders, and lathes requiring high rigidity and running accuracy.
- High-Speed Motors and Spindles: Used in electric motors, precision spindles, and other equipment operating at very high rotational speeds.
- Precision Robotic Drives: In robotic arms and joints where precise motion control and low friction are essential.
- Aerospace and Defense Systems: For gyroscopes, radar systems, and other instrumentation demanding the highest levels of reliability and precision.
