71938 CD/P4ADGA
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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71938 CD/P4ADGA Bearing Product Overview & Core Advantages
The 71938 CD/P4ADGA is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its universal matchable (SU) design allows for flexible mounting in various preload configurations when paired with a second, identical bearing. The bearing comes pre-lubricated and features a phenolic cage, making it an ideal solution for high-speed spindle applications where minimal vibration and thermal stability are critical.
Model Code Breakdown
- 71938: Basic designation indicating a super-precision angular contact ball bearing series with a 190mm bore.
- C: Signifies a 15° contact angle, optimized for high-speed operation and moderate axial loads.
- D: Indicates the bearing is part of a universal matchable (SU) pair.
- P4A: Denotes an ABEC 7 / ISO P4 tolerance class with additional running accuracy requirements.
- DGA: Specifies a phenolic (polyamide) cage and standard internal clearance/geometry for universal matching.
71938 CD/P4ADGA Bearing Structural Features & Performance Benefits
This bearing's performance is driven by its precision engineering and material selection:
- High Rigidity & Load Capacity: The angular contact design and universal matching capability enable it to withstand combined radial and axial loads simultaneously. The 15° contact angle provides an excellent balance for high-speed and load-carrying performance.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the precision-ground chrome steel components minimize friction and heat generation, supporting a high limiting speed.
- Exceptional Running Accuracy: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration, which is crucial for applications requiring extreme precision.
- Thermal Stability: The phenolic cage maintains dimensional stability across the operating temperature range, ensuring consistent performance.
71938 CD/P4ADGA Bearing Typical Application Areas
The 71938 CD/P4ADGA is engineered for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, precision grinders.
- High-Frequency Motors and Robotic Drives.
- Aerospace and Medical Equipment requiring ultra-precise rotational components.
