71928 CD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 CD/P4ADGA
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
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1479.11
/ each
In Stock
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71928 CD/P4ADGA Bearing Product Overview & Core Advantages
The 71928 CD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-matched set of two, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4A tolerance class and extra light preload (Class A) ensure smooth, high-precision operation, making it ideal for high-speed spindles and other high-rigidity applications where minimal deflection is critical.
71928 CD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing designation indicating the bearing size (140mm bore, 190mm OD, 48mm width) |
| CD | Contact angle of 15° and optimized internal design for high-speed performance |
| P4A | High precision tolerance class with dimensional and running accuracy exceeding ABEC 7 |
| DGA | Universal matchable bearing supplied in a pre-set duplex arrangement (two bearings) |
71928 CD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row angular contact design and universal matching provide superior stiffness, enabling the bearing to handle significant combined radial and axial loads with minimal deformation.
- Precision High-Speed Operation: Featuring a phenolic cage and 15° contact angle, this bearing achieves a limiting speed of 11,000 rpm. The optimized internal geometry reduces friction and heat generation.
- Exceptional Dimensional Stability: Manufactured to P4A tolerance class with tight bore and outside diameter tolerances (within -0.004mm to 0), ensuring precise fit and consistent performance in precision applications.
- Premium Material Construction: Both rings and balls are made from chrome steel for high durability and fatigue resistance, while the phenolic cage offers excellent strength-to-weight ratio at high speeds.
71928 CD/P4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning spindles requiring high rigidity and precision
- Precision Industrial Pumps: Centrifugal and multi-stage pumps where accurate shaft positioning is critical
- High-Speed Compressors: Turbo compressors and air bearing systems
- Robotic Systems: Precision joints and rotary tables in industrial robotics
- Aerospace Systems: Gyroscopes, navigation systems, and auxiliary power units
