7221 CDGC/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7221 CDGC/P4A Bearing Product Overview & Core Advantages
The 7221 CDGC/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universally matchable single bearing supplied in a set of two, it enables simplified assembly of preloaded duplex arrangements (DB, DF, DT) to achieve superior system stiffness. Its P4A tolerance class ensures minimal runout and consistent performance, while the moderate preload (Class C) provides optimal stiffness for high-speed operation. This bearing is engineered to handle combined loads efficiently, with a 15° contact angle offering an excellent balance between radial and axial load capacity.
7221 CDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7221 | Basic bearing series, defining the standard boundary dimensions: 105 mm bore, 190 mm OD, 36 mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed performance and moderate axial load capacity. |
| DG | Indicates a universal matchable bearing. Two identical bearings can be paired in any duplex configuration (Face-to-Face, Back-to-Back, Tandem) to achieve a defined preload. |
| C | Denotes Moderate Preload / Class C, providing increased rigidity for applications requiring high running accuracy. |
| P4A | The tolerance class, signifying extremely high precision for bore diameter, outer diameter, width, and runout tolerances. |
7221 CDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and exceptional running accuracy. The universal matching (SU) capability allows for the creation of preloaded pairs that deliver maximum system stiffness.
- Superior Load Capacity: The 15° contact angle and robust construction using chrome steel for rings and balls enable it to handle significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, and the 15° contact angle minimizes heat generation, contributing to a high limiting speed of 16,000 rpm.
- Pre-Lubricated & Open Design: The bearing comes lubricated from the factory and features an open seal type, making it suitable for integrated centralized lubrication systems in machine tools and other precision equipment.
7221 CDGC/P4A Bearing Typical Application Areas
The 7221 CDGC/P4A is ideally suited for high-performance machinery where precision, speed, and rigidity are critical. Key applications include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high rotational accuracy and stiffness.
- Precision Grinding Spindles: Where minimal runout and thermal stability are paramount.
- High-Frequency Motors & Spindles: Applications demanding operation at very high speeds.
- Industrial Pumps & Compressors: For reliable performance under combined loads in demanding fluid handling systems.
