7221 CD/P4ADGA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7221 CD/P4ADGA Bearing Product Overview & Core Advantages
The 7221 CD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial loads and thrust loads in both directions. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized internal geometry contribute to its superior high-speed performance and smooth operation.
7221 CD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing series, defining the standard dimensions: 105 mm bore, 190 mm OD, 72 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed applications and moderate thrust capacity. |
| D | Indicates the bearing is part of a Universal Matchable (SU) pair. Two such bearings can be mounted in any combination (back-to-back, face-to-face, or tandem) to achieve the required rigidity and load capacity. |
| P4A | The tolerance class, signifying extremely high precision for bore diameter, outer diameter, width, and running accuracy. |
| DGA | Suffix group indicating the bearing is lubricated and comes as a universally matchable pair (SU) with an Extra light (A) preload. |
7221 CD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The double row angular contact design and universal matching capability allow the bearing set to provide a very stiff support system, capable of handling heavy combined radial and axial loads from any direction.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the 15° contact angle and precision grinding minimize friction and heat generation, enabling a high limiting speed of 16,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring high rotational accuracy and surface finish quality.
- Optimized Internal Geometry: With a ball diameter of 26.988 mm and a quantity of 15 balls, the internal design is optimized for an ideal balance between load capacity and high-speed capability.
7221 CD/P4ADGA Bearing Typical Application Areas
The 7221 CD/P4ADGA is specified for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-power, high-speed transmission systems.
- Industrial Pumps and Compressors: For handling axial and radial loads in demanding fluid handling equipment.
- Aerospace and Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
