7221 ACDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7221 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7221 ACDGA/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and is manufactured to P4A tolerance class, ensuring superior running accuracy and dimensional stability. Its core advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-speed spindles and precision machinery where high rigidity and minimal runout are critical. The phenolic cage and universal matching designation (Universal Matchable (SU)) further enhance its performance in preloaded arrangements.
7221 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7221 | Basic Model Number | Denotes a metric series bearing with a 105 mm bore, 190 mm OD, and 36 mm width. |
| AC | Angular Contact | Designed to support combined radial and axial loads. |
| D | High Contact Angle (25°) | Optimized for higher axial load capacity. |
| GA | Light Preload | The bearing is supplied with a defined internal preload (Extra light / Class A) for enhanced stiffness and precise shaft positioning. |
| P4A | Tolerance Class | Signifies high-precision grade with tight dimensional and running accuracy tolerances, superior to ABEC-7. |
7221 ACDGA/P4A Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 25° contact angle and precision-ground raceways are engineered to provide excellent high-speed performance and high axial load capacity. The phenolic cage ensures smooth operation at the limiting speed of 16,000 rpm, offering low friction, low weight, and excellent acceleration characteristics.
Superior Rigidity and Load Capacity: The single-row design, when used in correctly preloaded pairs (as indicated by the SU universal matching), creates a highly rigid bearing system capable of withstanding significant combined loads. With a dynamic load rating of 36,675 lbf and a static load rating of 32,850 lbf, it offers reliable performance under strenuous operating conditions.
Precision and Stability: Manufactured to P4A tolerance class with tight bore, outer diameter, and width tolerances, this bearing guarantees minimal runout and consistent performance, which is critical for applications requiring high rotational accuracy.
7221 ACDGA/P4A Bearing Typical Application Areas
The 7221 ACDGA/P4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arm actuators.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace Systems: Gyroscopes and auxiliary power units.
