7220 CDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7220 CDGB/P4A Bearing Product Overview & Core Advantages
The 7220 CDGB/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with a 15° contact angle and Universal Matchable (SU) designation, it is engineered to accommodate combined radial and axial loads simultaneously. Manufactured to the stringent P4A tolerance class, this bearing offers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where reliability and performance are critical.
7220 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7220 | Basic series code, indicating a metric angular contact ball bearing with a 100mm bore and 180mm OD. |
| CD | Specifies a 15° contact angle and optimized internal geometry for high-speed operation. |
| GB | Indicates a Light preload / Class B. This preload eliminates internal clearance, enhancing rigidity and rotational accuracy. |
| P4A | Denotes an ultra-precision tolerance class with extremely tight limits on bore, outside diameter, and width tolerances for superior performance. |
7220 CDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The light preload (Class B) ensures the bearing operates with zero internal clearance, resulting in significantly increased system stiffness and precise shaft positioning, which is critical for machining accuracy.
Optimized High-Speed Performance: Featuring a phenolic resin cage, this bearing is capable of achieving a high limiting speed of 16,250 rpm. The cage's low weight and excellent sliding properties reduce centrifugal forces and friction at high rotational velocities.
Superior Load Capacity: The 15° contact angle and robust construction, including chrome steel rings and balls, provide a high dynamic load rating of 35,100 lbf and static load rating of 30,825 lbf, enabling reliable handling of combined loads.
Universal Matching Capability (SU): This bearing is universally matchable, allowing it to be mounted in tandem, back-to-back, or face-to-face arrangements with other SU-coded bearings without the need for selective assembly, simplifying installation and ensuring optimal preload.
7220 CDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Grinding Spindles: Applications where surface finish and dimensional accuracy are paramount.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
