71928 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71928 ACD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
2.77 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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
32850 lbf
Radial static load rating
49500 lbf
Limiting speed
11 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
No drawings available at the moment, will be launched soon
Price:
$ 2138.74
/ each
In Stock
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71928 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71928 ACD/HCP4ADGA is a super-precision angular contact ball bearing designed for the most demanding high-performance applications. Its core advantage lies in its ability to handle combined loads (radial and axial) simultaneously with exceptional accuracy and stability. Featuring a universal matchable (SU) design, two bearings can be paired to achieve optimal preload and rigidity. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, making it ideal for high-speed spindles and other precision machinery requiring high rigidity and minimal runout.
71928 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Enhanced internal design for high-precision applications. |
| HC | Hybrid Ceramic: Ceramic balls with steel rings. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4. |
| DGA | Universal Matchable (SU) arrangement. Two bearings are a matched set. |
71928 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life, especially at very high speeds (up to 11,000 rpm).
- Phenolic Resin Cage: This lightweight and robust cage material ensures excellent dimensional stability and low friction, contributing to smooth operation and high limiting speed.
- 25° Contact Angle & Universal Match (SU): The optimized contact angle provides excellent thrust capacity. The universal matchable design allows for flexible mounting of two bearings in any combination (DB, DF, DT) to achieve the required preload (Extra light / Class A) and system rigidity without selective sorting.
- Super-Precision P4A Tolerance: Extremely tight bearing dimensions and running accuracy ensure minimal vibration and precise shaft positioning, which is critical for machining quality and surface finish.
- Open Seal & Pre-lubrication: The open design allows for optimal lubrication management in controlled environments, while the factory-applied lubrication is suitable for the specified temperature range.
71928 ACD/HCP4ADGA Bearing Typical Application Areas
This precision bearing is engineered for high-end applications where speed, accuracy, and reliability are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors and Spindle Drives.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical rotating assemblies.
- Medical Equipment: Dental handpieces and advanced imaging systems.
