71928 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71928 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.39 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
24 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
21510 lbf
Radial static load rating
26100 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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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In Stock
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71928 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71928 CDGA/HCP4A is a single-row angular contact ball bearing engineered for ultra-high precision and superior performance in demanding applications. Positioned in the P4A tolerance class, it delivers exceptional running accuracy and dimensional stability. Its key advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for arrangements requiring high rigidity and precise shaft positioning. The combination of a ceramic ball material and phenolic cage contributes to its high-speed capability and extended service life.
71928 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CDGA | Indicates a Universal Matchable (SU) bearing designed with a 15° contact angle and Extra Light (Class A) preload. This suffix signifies the bearing is optimized for high-speed operation and is supplied as one of a matched set of 2 bearings. |
| HCP4A | Denotes the tolerance class P4A, which defines very tight dimensional and running accuracy tolerances, exceeding ABEC 7 standards. The "HC" component may refer to the specific material or design grade. |
71928 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: Manufactured to P4A tolerance class with a bore and outside diameter tolerance of -0.004mm to 0, ensuring minimal runout and vibration for superior positional accuracy.
- High-Speed Performance: The use of a phenolic resin cage and ceramic balls (Silicon Nitride) reduces centrifugal forces, lowers friction, and allows for a high limiting speed of 11,000 rpm. This combination also provides electrical insulation.
- Optimized Load Capacity: With a 15° contact angle, this bearing is engineered to support significant combined radial and axial loads (Dynamic: 21,510 lbf, Static: 26,100 lbf).
- Universal Matching & Preload: The Universal Matchable (SU) design with Extra Light preload simplifies installation in duplex arrangements (Back-to-Back or Face-to-Face), providing immediate rigidity and precise axial positioning without requiring additional adjustment.
71928 CDGA/HCP4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for applications requiring high speed, high rigidity, and exceptional accuracy, such as:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace & Defense Actuation Systems
