71928 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71928 ACDGA/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
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
24750 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
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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Product Overview and Core Advantages
The 71928 ACDGA/HCP4A is a precision angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. This single row bearing features an Extra Light (Class A) preload and a 25° contact angle, optimized to handle combined radial and axial loads simultaneously. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy. The combination of a phenolic cage and ceramic balls enables outstanding high-speed performance, with a limiting speed of 11,000 rpm, making it ideal for demanding, high-rotation applications.
71928 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing designation indicating the size series and 140 mm bore diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Enhanced internal geometry and optimized raceway design. |
| GA | Indicates a specific internal clearance and preload level (Extra Light / Class A). |
| HCP4A | Denotes a Universal Matchable (SU) bearing supplied as part of a matched set of 3 bearings to a P4A tolerance class for high-precision applications. |
Structural Features and Performance Benefits
- High-Speed Capability: The lightweight phenolic resin cage and low-density ceramic (silicon nitride) balls significantly reduce centrifugal forces, enabling stable operation at the high limiting speed of 11,000 rpm.
- Precision and Rigidity: Manufactured to P4A tolerance class with an Extra Light preload, this bearing ensures minimal runout and high system rigidity, which is critical for precision machining and positioning.
- Superior Load Capacity: The 25° contact angle provides an excellent balance, allowing the bearing to carry significant combined radial and axial loads with high dynamic (20,340 lbf) and static (24,750 lbf) load ratings.
- Universal Matching: As an SU-type Universal Matchable bearing supplied in a set, it allows for flexible mounting arrangements (DB, DF, DT) to achieve the required preload and stiffness without selective assembly.
71928 ACDGA/HCP4A Bearing Typical Application Areas
This high-precision, high-speed angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: For CNC machining centers, grinders, and milling machines requiring high rigidity and running accuracy.
- High-Frequency Motors and Spindles: Applications where high rotational speeds are paramount.
- Precision Instrumentation: Used in measuring devices and scientific equipment.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other critical rotational mechanisms.
