71820 ACD/P4DBC
71800 Series Super Precision Angular Contact Ball Bearings
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71820 ACD/P4DBC Bearing Product Overview & Core Advantages
The 71820 ACD/P4DBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) with a moderate preload (Class C) provides superior stability and can simultaneously support combined radial and axial loads. Manufactured to P4 tolerance class, it delivers high running accuracy and is ideal for high-speed, high-precision machinery where uncompromising performance is critical.
71820 ACD/P4DBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71820 | Basic bearing series and size designation (100mm bore, 125mm OD, 26mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (two bearings supplied as a matched set). |
| P4 | High precision tolerance class, ensuring minimal runout and vibration. |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity. |
| C | Moderate preload level for enhanced stiffness and precise shaft positioning. |
71820 ACD/P4DBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and providing exceptional system rigidity.
Superior Load Capacity: The 25° contact angle and robust construction, featuring 34 chrome steel balls, enable the bearing to handle significant combined radial and axial loads simultaneously.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to a high limiting speed of 15,000 rpm. The bearings are pre-lubricated for immediate operation.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing ensures high running accuracy and consistent performance in demanding applications.
71820 ACD/P4DBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for:
- Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Frequency Spindle Motors
- Precision Gearboxes and Robotic Drives
- Medical and Dental Equipment Spindles
- High-Speed Pumps and Compressors
