7217 ACD/P4ATBTC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7217 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 7217 ACD/P4ATBTC is a precision angular contact ball bearing specifically designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set features a triplex back-to-back (TBT) arrangement, providing superior stiffness and stability under complex combined loads. Manufactured to P4A tolerance class with a 25° contact angle and moderate preload (Class C), it is engineered for high-performance spindles and precision machinery where high rigidity and rotational accuracy are paramount.
7217 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
| TBT | Triplex Back-to-Back arrangement. A set of three bearings mounted back-to-back. |
| C | Moderate preload class, optimized for high rigidity and precise shaft positioning. |
7217 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
Triplex Back-to-Back Arrangement: The core of this bearing's performance. Three bearings are universally matched and mounted in a back-to-back configuration, creating an extremely rigid bearing system that effectively resists moment loads and shaft deflection.
High Load Capacity: The 25° contact angle and robust construction, including a phenolic cage and chrome steel components, enable high radial dynamic load rating (46,800 lbf) and static load rating (57,375 lbf), making it suitable for significant combined loads.
Precision & Speed: The P4A tolerance class ensures minimal runout and vibration for superior operational accuracy. The phenolic cage contributes to a high limiting speed of 17,000 rpm, suitable for high-speed applications.
Optimized Design: With a bore diameter of 85 mm and outside diameter of 150 mm, the design is compact. The open seal type allows for customized lubrication schemes to further enhance performance in specific operating conditions.
7217 ACD/P4ATBTC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where maximum rigidity and precision are critical.
- Precision Grinding Spindles: Applications requiring exceptional running accuracy and stability under load.
- High-Frequency Motor Spindles: Used in motors for CNC machinery that demand high rotational speeds and stiffness.
- Industrial Pumps & Compressors: For shafts subjected to heavy radial and axial loads in demanding environments.
