71821 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71821 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71821 ACD/P4DGC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Operating under P4 tolerance class, this bearing is engineered to handle combined loads efficiently, offering superior performance in high-speed and high-precision environments. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs, providing optimized preload and system stability. The phenolic cage and chrome steel construction contribute to its high rigidity and reliable operation.
71821 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° contact angle design, optimized for high rigidity and axial load capacity |
| P4 | High precision tolerance class, ensuring minimal runout and vibration |
| DGC | Moderate preload (Class C), providing optimal stiffness for universal matching applications |
71821 ACD/P4DGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The 25° contact angle and robust construction enable the bearing to support significant combined radial and axial loads. The universal matchable (SU) characteristic allows two bearings to be mounted in various configurations (back-to-back, face-to-face, or tandem) to achieve the required system rigidity and preload.
Precision & High-Speed Performance: Manufactured to P4 tolerance class with tight dimensional controls, this bearing ensures minimal vibration and high running accuracy. The phenolic cage contributes to reduced friction and enables operation at high rotational speeds up to 16,000 rpm.
Optimized Material & Design: Constructed from chrome steel for both rings and balls, the bearing offers high durability and wear resistance. The open design, combined with factory lubrication, ensures immediate readiness for installation and operation within a wide temperature range.
71821 ACD/P4DGC Bearing Typical Application Areas
- Machine Tool Spindles: For high-precision machining centers requiring exceptional rigidity and accuracy.
- High-Speed Motors & Spindles: In applications demanding stable performance at elevated rotational speeds.
- Precision Instrumentation: Used in measuring equipment and analytical instruments where minimal runout is critical.
- Industrial Pumps & Compressors: For handling combined loads in demanding fluid and air handling systems.
