71928 CD/P4ADFC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 CD/P4ADFC
Basic Information
System of measurement
Metric
Weight
3.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
34425 lbf
Radial static load rating
52200 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 972.18
/ each
In Stock
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71928 CD/P4ADFC Bearing Product Overview & Core Advantages
The 71928 CD/P4ADFC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex face-to-face (DF) arrangement consists of two matched bearings preloaded to a Moderate (Class C) level, delivering superior system stability. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously, making it an ideal solution for high-precision spindles and other critical machinery where high rigidity and precise shaft positioning are paramount. Manufactured to the exacting P4A tolerance class, it ensures minimal runout and consistent performance.
71928 CD/P4ADFC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| CD | 15° Contact Angle, Duplex Face-to-Face (DF) Arrangement | Optimized for high-speed operation and provides high rigidity against moment loads. |
| P4A | High Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for superior performance in precision applications. |
| DF | Duplex Face-to-Face Matched Set | Increases system rigidity and accommodates axial loads from both directions. |
| C | Moderate Preload | Reduces axial and radial play, enhancing shaft stability and system stiffness without excessive heat generation. |
71928 CD/P4ADFC Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex face-to-face (DF) arrangement with a moderate preload creates a highly rigid bearing system that effectively resists complex moment loads and ensures precise shaft guidance.
- Superior Load Capacity: With a dynamic load rating of 34,425 lbf and a static load rating of 52,200 lbf, this bearing is engineered to handle significant combined radial and axial loads.
- Optimized High-Speed Performance: The 15° contact angle and lightweight phenolic resin cage are designed for stable operation at high speeds, with a limiting speed of 11,000 rpm.
- Precision Engineering: Conforming to the P4A tolerance class, this bearing offers minimal dimensional variation and runout, which is critical for applications demanding the highest levels of accuracy.
- Durable Material Construction: Manufactured from chrome steel for both rings and balls, this bearing provides excellent wear resistance and long service life.
71928 CD/P4ADFC Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads requiring high rigidity and precision.
- High-Frequency Motors: Where high rotational speeds and accurate shaft positioning are essential.
- Precision Instrumentation: In measuring devices and optical equipment that demand minimal runout and vibration.
- Industrial Pumps and Compressors: For applications with significant axial and radial load components.
