71820 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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71820 ACD/P4DGA Bearing Product Overview & Core Advantages
The 71820 ACD/P4DGA is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a universal matchable (SU) bearing, it can be paired with another identical bearing in a back-to-back (DB) or face-to-face (DF) arrangement to accommodate combined loads (radial and axial) from both directions. Its P4 tolerance class ensures ultra-precise running accuracy, while the extra light preload (Class A) minimizes deflection under load, making it ideal for high-speed spindles and other precision machinery where rigidity and minimal runout are critical.
71820 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| ACD | 25° Contact Angle, Universal Matchable (SU) Design | Optimized for high axial load capacity and moment load resistance. The universal matchable feature allows for flexible mounting arrangements without selective assembly. |
| P4 | P4 Tolerance Class (DIN 620) | Denotes high precision with extremely tight dimensional and running accuracy tolerances, essential for applications requiring minimal vibration and high rotational accuracy. |
| DGA | Phenolic Cage, Lubricated | The phenolic cage offers low weight, high strength, and excellent performance at high speeds. The bearing is pre-lubricated for immediate operation. |
71820 ACD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and robust double-row design provide superior stiffness, enabling the bearing to handle significant combined radial and axial loads simultaneously. The universal matching capability further enhances system rigidity when used in pairs.
- High-Speed Performance: The lightweight phenolic cage (DGA) reduces centrifugal forces, allowing for a high limiting speed of 15,000 rpm. This makes the bearing suitable for demanding high-speed applications.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for maintaining accuracy in precision equipment.
- Optimized Internal Geometry: With 34 high-grade chrome steel balls of precise diameter, the bearing ensures smooth operation, uniform load distribution, and long service life.
71820 ACD/P4DGA Bearing Typical Application Areas
The 71820 ACD/P4DGA is engineered 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 Robotics: Arm joints and rotary actuators requiring high positional accuracy.
- High-Frequency Motors and Spindles: Applications in PCB drilling, dental handpieces, and small precision drives.
- Medical and Laboratory Equipment: Centrifuges, scanners, and other precision instruments.
- Aerospace Actuation Systems: Control surface actuators and auxiliary power units.
