S71928 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71928 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.4 kg
Tolerance class
P4A
Seal type
Sealed
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
Grease
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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In Stock
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S71928 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The S71928 ACDGA/HCP4A is a high-precision, single-row angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. Its core advantage lies in its ability to support combined loads—significant radial loads alongside substantial axial loads in one direction. Manufactured to a P4A super-precision tolerance and featuring a ceramic ball and phenolic cage construction, this bearing is optimized for high-speed operation and offers superior rigidity and long-term performance in demanding environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1928 | Bore diameter code (140 mm) and dimension series. |
| AC | 25° contact angle, optimized for high axial load capacity. |
| DGA | Designates a Universal Matchable (SU) bearing, allowing for precise preload setting when mounted with other bearings from the same set. |
| HC | Indicates a phenolic (Polyamide) cage, contributing to low weight, high strength, and excellent performance at high speeds. |
| P4A | Denotes a super-precision tolerance class, ensuring extremely tight running accuracy for the most demanding applications. |
S71928 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row design with a 25° contact angle and P4A tolerance provides exceptional rotational accuracy and system stiffness, crucial for minimizing deflection under load.
- Superior Load Capacity: Engineered to handle combined radial and axial loads efficiently. The dynamic load rating of 20,340 lbf and static load rating of 24,750 lbf ensure reliable performance under significant stress.
- Enhanced High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 11,000 rpm and lower operating temperatures.
- Sealed and Lubricated for Life: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is designed for maintenance-free operation within its specified temperature range (-30°C to 110°C).
S71928 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and reliability are paramount. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles: Where minimal runout and thermal stability are required.
- Precision Instrumentation: In medical devices, optical scanners, and coordinate measuring machines.
- Aerospace and Defense Systems: In gyroscopes, radar systems, and other critical rotating assemblies.
