7217 CDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7217 CDGB/P4A Bearing Product Overview & Core Advantages
The 7217 CDGB/P4A is a high-precision single row angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it offers superior dimensional and running accuracy, making it ideal for high-speed spindles and precision machinery. Its key advantage lies in its ability to support combined loads (radial and axial) simultaneously, while the Universal Matchable (SU) designation allows for flexible mounting in preloaded sets to achieve optimal stiffness and performance. With a light preload (Class B) and a 15° contact angle, it provides an excellent balance between high-speed capability and axial load capacity.
7217 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing designation indicating a metric, single row angular contact ball bearing with 85mm bore, 150mm OD, and 28mm width. |
| C | Denotes a 15° contact angle, optimized for high-speed applications. |
| DGB | Indicates a Universal Matchable (SU) bearing. Two bearings can be mounted in a "back-to-back" (DB) arrangement to support moment loads. |
| P4A | Specifies the tolerance class, denoting very high precision for both dimensional and running accuracy, superior to ABEC-7. |
7217 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance class with tight dimensional tolerances on bore, outside diameter, and width, this bearing ensures minimal runout and stable operation under high-speed conditions, contributing to superior system rigidity.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently handle significant combined loads, providing excellent performance for applications with simultaneous radial and axial forces.
- Superior High-Speed Performance: The lightweight and robust phenolic resin cage ensures stable guidance of the balls at high rotational speeds, contributing to the high limiting speed of 17,000 rpm. The bearing is supplied lubricated for immediate operation.
- Universal Matching Capability: The Universal Matchable (SU) feature allows this bearing to be universally paired with another bearing of the same designation in a preloaded set (typically back-to-back or face-to-face), simplifying inventory and assembly while achieving precise preload and stiffness.
7217 CDGB/P4A Bearing Typical Application Areas
The 7217 CDGB/P4A is specified for high-performance applications where precision, speed, and rigidity are critical. Key industries and machinery include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace & Defense Positioning Systems
