7220 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7220 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7220 CD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and moment load capacity, making it ideal for high-precision spindles. With a P4A tolerance class and light preload (Class B), it ensures minimal runout and stable performance under combined radial and axial loads. The phenolic cage and optimized 15° contact angle contribute to its high-speed capabilities and smooth operation.
7220 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7220 | Basic bearing series, indicating a 100mm bore, 180mm OD, and 68mm width. |
| C | 15° nominal contact angle, optimized for combined loads. |
| D | Duplex (two single bearings mounted as a set). |
| DB | Back-to-Back mounting arrangement for high moment stiffness. |
| P4A | High precision tolerance class (equivalent to ABEC 7), with enhanced width and runout tolerances. |
7220 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Moment Load Capacity: The back-to-back duplex arrangement creates a wide effective spread between load centers, significantly increasing system stiffness and resistance to moment loads. This configuration is essential for applications requiring high positional accuracy.
Superior Load Handling: With a dynamic load rating of 57,375 lbf and static load rating of 60,750 lbf, this bearing reliably handles significant combined radial and axial loads. The 15° contact angle provides an optimal balance between radial and axial load capacity.
High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at high speeds, supporting the limiting speed of 16,000 rpm. The light preload ensures stable operation while minimizing heat generation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and minimal vibration for precision applications.
7220 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling spindles
- Precision Gearboxes: Industrial gearboxes requiring high stiffness and accuracy
- High-Speed Motors: Spindle motors and high-frequency motor applications
- Medical Equipment: CT scanner gantries and precision medical devices
- Aerospace Components: Guidance systems and aircraft instrumentation
- Robotics: Precision robot joints and articulated arms
