7221 CDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7221 CDGA/P4A is a premium single-row angular contact ball bearing designed for applications demanding exceptional precision and reliability. Engineered to accommodate combined loads (simultaneous radial and axial loads), this bearing features a 15° contact angle optimized for high axial load capacity. Manufactured to P4A tolerance class, it delivers superior running accuracy, making it ideal for high-speed, high-precision machinery. Its universal matchable (SU) design allows for flexible mounting arrangements in duplex sets, providing exceptional operational stability and system rigidity.
7221 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing designation (105 mm bore, 190 mm OD, 36 mm width) |
| C | 15° nominal contact angle |
| DG | Universal matchable bearing (can be paired in any duplex configuration) |
| A | Extra light preload for minimal friction and optimal high-speed performance |
| P4A | High precision tolerance class (exceeds ABEC 7 standards) for superior running accuracy |
Structural Features and Performance Benefits
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring exceptional running accuracy and minimal vibration.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling a limiting speed of 16,000 rpm. The 15° contact angle and optimized internal geometry further enhance high-speed performance.
Superior Load Capacity: Chrome steel construction and precision-ground raceways deliver a dynamic load rating of 38,700 lbf and static load rating of 34,425 lbf, providing reliable performance under demanding combined load conditions.
Universal Matching Flexibility: The SU (Universal Matchable) designation allows two bearings to be paired in back-to-back (DB), face-to-face (DF), or tandem (DT) arrangements without selective mounting, simplifying installation and ensuring optimal preload.
7221 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC lathes requiring exceptional accuracy and speed.
- High-Speed Motors and Spindles: Electric motors, frequency converter motors, and high-frequency spindles where minimal runout and thermal stability are critical.
- Precision Instrumentation: Measuring equipment, optical scanners, and laboratory instruments demanding ultra-precise rotational performance.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and navigation equipment requiring reliable operation under precise tolerances.
