71920 ACD/PA9ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71920 ACD/PA9ADT Bearing Product Overview & Core Advantages
The 71920 ACD/PA9ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This bearing features a duplex tandem (DT) arrangement, where two bearings are pre-loaded and matched to work as a single unit, significantly enhancing axial rigidity and load-carrying capacity. Its PA9A tolerance class ensures ultra-precise dimensional control, making it ideal for high-speed spindles and precision machinery. The combination of a phenolic cage and optimized 25° contact angle delivers superior high-speed performance and the ability to handle combined loads efficiently.
71920 ACD/PA9ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD, 40mm width). |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | Indicates a duplex (two-bearing) set. |
| PA9A | Specifies the high-precision tolerance class, ensuring minimal runout and superior rotational accuracy. |
| DT | Denotes the Duplex Tandem arrangement, where bearings are mounted in series to maximize axial load capacity in one direction. |
71920 ACD/PA9ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle create an exceptionally rigid bearing system capable of supporting heavy combined loads and high unidirectional axial thrust.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 15,000 rpm. The open design facilitates efficient lubrication management.
- Precision Engineering: Manufactured to PA9A tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees minimal vibration and high positional accuracy in precision assemblies.
- Optimized Material Selection: Components made from chrome steel provide high fatigue life and durability, ensuring long-term reliability under demanding operating conditions.
71920 ACD/PA9ADT Bearing Typical Application Areas
The 71920 ACD/PA9ADT is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high stiffness.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Where extreme rotational accuracy and speed are required.
