71820 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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71820 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71820 ACD/P4DBA is a metric duplex angular contact ball bearing designed for applications demanding exceptional precision and rigidity. This precision bearing features a Back-to-Back (DB) matched arrangement and is manufactured to P4 tolerance class, ensuring superior running accuracy. Its core advantage lies in its ability to support combined loads—simultaneously handling significant radial and axial loads from both directions. The duplex DB configuration provides high rigidity and excellent moment load capacity, making it ideal for high-speed, high-precision spindles and other critical machinery where positional accuracy is paramount.
71820 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing designation, indicating a 100 mm bore, 125 mm OD, and 26 mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (Two single bearings supplied as a matched set). |
| DB | Back-to-Back arrangement of the duplex pair for high rigidity and moment load capacity. |
| P4 | High precision tolerance class for applications requiring extreme running accuracy. |
| A | Specifies an Extra Light preload for minimal friction and optimal high-speed performance. |
71820 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Moment Load Capacity: The duplex Back-to-Back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring stable operation under demanding conditions.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 7762 lbf, this bearing is engineered to handle significant combined radial and axial loads from both directions simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage and extra light preload (A) minimize centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm. The open design allows for efficient lubrication management.
- Precision & Accuracy: Manufactured to P4 tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and minimal vibration for precision machinery.
71820 ACD/P4DBA Bearing Typical Application Areas
This high-precision, high-rigidity bearing is specifically designed for advanced applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors and Spindles: Where high rotational speeds and accuracy are critical.
- Industrial Pumps and Compressors: For shafts subjected to significant axial and radial forces.
