71938 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71938 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71938 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair configuration is engineered to handle combined loads—simultaneous radial and axial loads—with high stability. Featuring an Extra Light (A) preload and a P4A tolerance class, it delivers superior running accuracy and minimal deflection under operational stresses. The phenolic cage and optimized 25° contact angle contribute to its high-speed capability and smooth operation, making it an ideal solution for high-performance machinery.
71938 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing designation indicating size series and bore diameter (190 mm). |
| AC | Angular Contact design, optimized for combined radial and axial loads. |
| D | Duplex configuration, indicating two bearings are supplied as a matched set. |
| P4A | High Precision Tolerance Class, ensuring extremely tight dimensional and running accuracy. |
| DB | Back-to-Back arrangement, providing high moment rigidity and stability. |
| A | Extra Light Preload, minimizing friction and heat generation for high-speed operation. |
71938 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex design creates a wide effective spread, significantly increasing system rigidity and resistance to moment loads, which is critical for maintaining precision under heavy combined loads.
- Superior Load Capacity: With a radial dynamic load rating of 58,500 lbf and a static load rating of 93,375 lbf, this bearing is built to withstand demanding operational conditions. The 25° contact angle is optimized for substantial axial load carrying capacity in both directions.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes friction. This combination allows for a high limiting speed of 11,000 rpm, suitable for rapid rotation applications.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances, this bearing ensures minimal runout and vibration, which is essential for applications requiring high rotational accuracy.
- Durable Construction: Components made from chrome steel provide high hardness and wear resistance, ensuring a long service life even in continuous operation.
71938 ACD/P4ADBA Bearing Typical Application Areas
The 71938 ACD/P4ADBA is specifically designed for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high rotational precision and stiffness.
- Precision Gearboxes: In industrial automation and robotics where low backlash and high-speed capability are critical.
- High-Frequency Spindles: Used in PCB drilling, engraving, and other high-speed machining applications.
- Medical Equipment: In high-speed centrifuges and imaging device rotors.
- Aerospace Actuation Systems: For control surface mechanisms and auxiliary power units.
