71938 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71938 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71938 CD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4A tolerance class and light preload (Class B) ensure smooth, high-precision operation, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount.
71938 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71938 | Basic bearing series and size designation | Identifies the bearing's dimensions: 190mm bore, 260mm OD, 66mm width. |
| CD | Contact angle of 15° | Optimized for handling combined radial and axial loads efficiently. |
| P4A | High precision tolerance class | Guarantees extremely tight dimensional and running accuracy for superior performance in precision applications. |
| DGB | Duplex set, universal matchable (SU), light preload | Indicates the bearing is supplied as a universally matchable pair (SU) with a light preload (Class B) applied, ensuring immediate high rigidity and simplified mounting. |
71938 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex set configuration and 15° contact angle create a highly rigid bearing system capable of withstanding substantial combined loads (Radial dynamic load: 62,100 lbf, Static: 99,000 lbf).
- Precision High-Speed Performance: The P4A tolerance and phenolic resin cage contribute to smooth operation and low vibration at high rotational speeds, with a limiting speed of 16,250 rpm.
- Optimized Internal Geometry: With 28 balls of 22.225 mm diameter manufactured from chrome steel, the bearing provides high load capacity and durability.
- Universal Matchability (SU): This feature allows any two bearings from the same lot to be mounted in any combination (back-to-back, face-to-face, or tandem) to achieve the desired rigidity and load configuration, offering immense flexibility in application design.
71938 CD/P4ADGB Bearing Typical Application Areas
The 71938 CD/P4ADGB is specified for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-power, high-speed industrial drives.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision mechanisms.
- High-Frequency Motors and Spindles: Used in PCB drilling, semiconductor manufacturing, and other high-precision automation.
