71920 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71920 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71920 ACD/P4ADBA is a super-precision angular contact ball bearing designed for the most demanding applications. Its core advantage lies in its duplex back-to-back (DB) arrangement and P4A tolerance class, delivering exceptional rotational accuracy, high system rigidity, and superior performance under combined loads. This configuration is optimized to handle significant radial and axial loads simultaneously, making it an ideal choice for high-speed spindles and precision machinery where uncompromising accuracy and reliability are paramount.
71920 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two single bearings as a set). |
| DB | Back-to-Back arrangement for high moment rigidity. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4, with specific running accuracy requirements. |
| A | Extra light preload for minimal friction and optimal high-speed performance. |
71920 ACD/P4ADBA Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its sophisticated design and material selection:
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness and enables the bearing to handle heavy combined radial and axial loads.
- Super-Precision Operation: Manufactured to P4A tolerance class with extremely tight dimensional and running accuracy tolerances, ensuring minimal runout and vibration for superior finish and positioning accuracy.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, reducing centrifugal forces and allowing for a limiting speed of 15,000 rpm. The 25° contact angle provides an excellent balance between axial load capacity and speed.
- Premium Material Construction: Both rings and balls are made from high-grade chrome steel, offering excellent wear resistance and durability for a long service life in demanding conditions.
71920 ACD/P4ADBA Bearing Typical Application Areas
The 71920 ACD/P4ADBA is engineered for high-performance machinery where precision and speed are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Industrial Pumps and Compressors
- Advanced Robotics and Automation
