7220 CD/P4ATBTA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7220 CD/P4ATBTA Bearing Product Overview & Core Advantages
The 7220 CD/P4ATBTA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This triplex back-to-back (TBT) matched set delivers superior performance in handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with an extra light preload, it ensures smooth operation, minimal vibration, and extended service life in high-speed, high-precision environments. Its compact design integrates three bearings into a single, highly rigid unit, making it ideal for complex spindle arrangements.
Model Code Breakdown
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7220 | Basic Bearing Number | Defines the standard bore diameter (100 mm), outside diameter (180 mm), and width (102 mm). |
| CD | Contact Angle & Design | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| P4A | Tolerance Class | Indicates high precision with extremely tight dimensional and running accuracy tolerances. |
| TBT | Matched Arrangement | Denotes a Triplex Back-to-Back set of three bearings, providing maximum rigidity and moment load capacity. |
| A | Preload | Signifies an Extra Light preload, minimizing friction and heat generation for high-speed applications. |
7220 CD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back configuration creates an extremely stiff bearing system capable of withstanding heavy combined loads and significant moment loads, ensuring precise shaft positioning and minimal deflection under operation.
- High-Speed Capability: The combination of a 15° contact angle, light preload, and a phenolic cage reduces centrifugal forces and friction, enabling stable performance at the high limiting speed of 16,250 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with very tight bore and outside diameter tolerances, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Durable Material Construction: Made from chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance. The phenolic cage provides strength and stability at high speeds with low weight.
7220 CD/P4ATBTA Bearing Typical Application Areas
The 7220 CD/P4ATBTA is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Spindle motors and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotational mechanisms.
