71821 ACDGA/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71821 ACDGA/P4 is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Positioned in the P4 tolerance class, it delivers superior running accuracy for demanding machinery. Its 25° contact angle is optimized to handle significant combined loads (radial and axial) simultaneously. The bearing comes pre-lubricated and is Universal Matchable (SU), allowing for precise duplex arrangements to achieve even higher system rigidity and preload control. Its compact cross-section makes it ideal for space-constrained, high-performance applications.
71821 ACDGA/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Designates a Universal Matchable (SU) bearing with an Extra light (A) preload. |
| P4 | Indicates a high-precision tolerance class for superior running accuracy. |
Structural Features and Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration, which is critical for applications like machine tool spindles. The phenolic cage provides high strength with low weight, contributing to stable operation at high speeds.
- Superior Load Capacity: The 25° contact angle is engineered to support substantial combined radial and axial loads efficiently. With a dynamic load rating of 4860 lbf and a static load rating of 6412 lbf, it offers reliable performance under demanding conditions.
- Optimized High-Speed Performance: The lightweight phenolic cage, combined with the optimized internal geometry, allows for a high limiting speed of 16,000 rpm. This makes it suitable for high-speed spindle applications.
- Universal Matching Capability (SU): As a Universal Matchable bearing, two 71821 ACDGA/P4 bearings can be precisely paired in a duplex set (e.g., DB or DF arrangement) to share loads effectively and achieve a pre-defined preload, enhancing system stiffness and accuracy.
71821 ACDGA/P4 Bearing Typical Application Areas
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace Control Systems
