71938 CDGA/P4A
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 CDGA/P4A Bearing Product Overview & Core Advantages
The 71938 CDGA/P4A is a single-row angular contact ball bearing designed for applications requiring high precision and superior performance. Manufactured to P4A tolerance class, this bearing delivers exceptional dimensional accuracy and running precision. Its 15° contact angle provides optimal performance for combined loads, effectively handling both radial and axial loads in one direction. The extra light preload (Class A) ensures minimal friction and smooth operation, making it ideal for high-speed applications with demanding precision requirements.
71938 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing designation with 190mm bore diameter |
| C | 15° contact angle design |
| D | High precision manufacturing |
| G | Universal Matchable (SU) bearing |
| A | Extra light preload classification |
| P4A | Ultra-precision tolerance class |
71938 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision Construction: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional stability and running accuracy.
Optimized Load Capacity: The 15° contact angle and 28 chrome steel balls with 22.225mm diameter provide excellent combined load capacity, rated at 38,700 lbf dynamic and 49,500 lbf static radial load.
High-Speed Performance: The phenolic cage and optimized internal design enable a limiting speed of 16,250 rpm, making it suitable for high-speed applications.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings, allowing precise arrangement in sets of 4 for complex bearing configurations requiring exact preload and stiffness characteristics.
Material Excellence: Constructed from chrome steel for both rings and balls, providing superior durability and wear resistance across the operating temperature range of -30°C to 110°C.
71938 CDGA/P4A Bearing Typical Application Areas
The 71938 CDGA/P4A is ideally suited for precision applications including:
- Machine tool spindles requiring high precision and rigidity
- High-speed machining centers and precision grinding machines
- Industrial pumps and compressors demanding reliable performance
- Aerospace positioning systems requiring ultra-precision bearings
- Medical equipment and precision instrumentation
- Robotic arm joints and precision automation systems
