71938 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71938 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71938 ACD/P4ADGB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it excels at handling combined loads—simultaneously supporting significant radial and axial loads in both directions. Its P4A tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized 25° contact angle contribute to its superior high-speed performance and operational stability.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing series and size designation (190mm bore, 260mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates the bearing is part of a duplex set (two bearings). |
| P4A | High precision tolerance class, guaranteeing extremely tight dimensional and running accuracy. |
| DB | Universal Matchable (SU) arrangement. Bearings can be mounted in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations. |
| GB | Specifies a Light preload / Class B, which increases system rigidity and minimizes axial and radial runout. |
71938 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex set configuration creates a highly rigid bearing system capable of withstanding combined radial and axial loads from any direction. The 25° contact angle is optimized for substantial axial load carrying capacity.
Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and allows for a limiting speed of 11,000 rpm. This makes the bearing an excellent choice for high-speed applications.
Precision Engineering: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for maintaining accuracy in precision machinery. The universal matchable (SU) design offers flexibility in mounting arrangements to suit specific application needs for optimal performance.
Robust Material Construction: The rings and balls are made from high-grade chrome steel, providing excellent durability and fatigue resistance, ensuring a long operational life under demanding conditions.
71938 ACD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Grinding Spindles: Applications where minimal vibration and runout are critical for surface finish quality.
- High-Frequency Motors and Spindles: Electric spindles and high-RPM motor shafts.
- Industrial Pumps and Compressors: For shafts subjected to significant axial and radial forces.
- Aerospace and Defense Equipment: Gyroscopes, radar systems, and other high-reliability rotating assemblies.
