71938 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71938 CD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
7.27 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
260 mm
Outside diameter tolerance
-0.004mm to 0
Width
66 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
22.225 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
62100 lbf
Radial static load rating
99000 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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71938 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71938 CD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered as a universally matchable (SU) bearing supplied in a pre-set pair, it delivers superior high rigidity and can accommodate combined radial and axial loads. Its construction with a P4A tolerance class and phenolic cage makes it an ideal choice for high-speed operation and high-reliability scenarios where precision is paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71938 | Basic bearing series and size designation (190mm bore, 260mm OD). |
| CD | Universal Matchable (SU) bearing designed to be paired in a specific arrangement. |
| HC | Hybrid Ceramic, indicating ceramic balls for reduced weight and enhanced speed capability. |
| P4A | High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy. |
| DGA | Contact angle of 15° and Extra Light (A) preload. |
71938 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The universal matching (SU) pair configuration provides stable, rigid support for spindles, effectively handling combined loads from multiple directions.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and ceramic balls significantly reduces centrifugal forces, enabling a high limiting speed of 16,250 rpm.
- Enhanced Precision and Longevity: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration. The open seal type allows for optimized lubrication management in controlled environments.
- Optimized Preload: The extra light preload (Class A) minimizes friction and heat generation while maintaining shaft positioning accuracy, ideal for precision applications.
71938 CD/HCP4ADGA Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Where low inertia and high rotational accuracy are critical.
