71928 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71928 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
1.65 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71928 CDGB/P4A Bearing Product Overview & Core Advantages
The 71928 CDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Operating under a P4A tolerance class, it guarantees minimal dimensional runout and smooth operation. Its 15° contact angle and Universal Matchable (SU) designation make it ideally suited to handle combined loads and be preloaded in pairs to achieve maximum system rigidity and precise shaft positioning. This bearing is pre-lubricated for immediate use and features an open design for controlled lubrication management in high-performance systems.
71928 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71928 | Basic bearing series and size designation | Indicates a metric, angular contact bearing with a 140mm bore, 190mm OD, and 24mm width. |
| C | 15° contact angle | Optimized for high-speed applications requiring a balance between radial and axial load capacity. |
| DGB | Universal Matchable (SU) bearing set | Allows two bearings to be mounted in any preload arrangement (back-to-back, face-to-face, or tandem) without selective mounting, simplifying installation and ensuring optimal performance. |
| P4A | Tolerance class | Denotes a super-precision bearing with extremely tight tolerances on bore, outside diameter, and width for superior running accuracy. |
71928 CDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class standards, this bearing ensures exceptional dimensional stability and minimal runout, which is critical for applications requiring high positional accuracy.
- Superior Load Capacity: The 15° contact angle enables the bearing to efficiently support significant combined (radial and axial) loads, making it robust for demanding operational conditions.
- Optimized High-Speed Performance: The lightweight and durable phenolic cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 11,000 rpm. The open seal type allows for efficient lubrication management essential for high-speed operation.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing to create a preloaded set, dramatically increasing system rigidity and rotational accuracy without the need for selective assembly.
71928 CDGB/P4A Bearing Typical Application Areas
This super-precision angular contact ball bearing is engineered for high-performance machinery where accuracy and speed are paramount. Key applications include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Medical and Dental Equipment Drives
