S71928 ACD/P4ATGA
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71928 ACD/P4ATGA
Basic Information
System of measurement
Metric
Weight
5.06 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
72 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
43875 lbf
Radial static load rating
75375 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Universal Matchable (SU)
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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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S71928 ACD/P4ATGA Bearing Product Overview & Core Advantages
The S71928 ACD/P4ATGA is a precision double-row angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. Engineered to simultaneously handle combined radial and axial loads from both directions, its compact double-row design offers a high load density in a limited space. Manufactured to the stringent P4A tolerance class and featuring a universal matchable (SU) designation, this bearing is ideal for high-speed, high-reliability spindle arrangements and precision machinery where superior running accuracy and dimensional stability are paramount.
S71928 ACD/P4ATGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| ACD | 25° Contact Angle, Double Row Design | Optimized for handling significant combined loads and providing high axial rigidity. |
| P4A | High Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for superior performance in precision applications. |
| T | Phenolic (Textile) Cage | Contributes to lower friction, lower heat generation, and higher limiting speeds. |
| GA | Light Preload (Class A) | Reduces internal clearance for enhanced shaft guidance, rigidity, and reduced noise and vibration. |
S71928 ACD/P4ATGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double-row angular contact design provides superior radial and axial stiffness, enabling the bearing to withstand heavy combined loads without significant deflection. This is critical for maintaining precision under load.
- Optimized High-Speed Performance: The lightweight phenolic cage and optimized internal geometry, including a 25° contact angle, work in concert to minimize centrifugal forces and friction, allowing for a high limiting speed of 11,000 rpm.
- Precision Engineering: Conforming to the P4A tolerance class, this bearing ensures minimal runout and precise dimensional control, which is essential for applications requiring extreme accuracy and smooth operation.
- Universal Matchability (SU): As a universal matchable bearing, multiple S71928 ACD/P4ATGA units can be mounted together in various arrangements (back-to-back, face-to-face, tandem) without selective matching, simplifying installation and ensuring optimal preload and performance in multi-bearing setups.
S71928 ACD/P4ATGA Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery where speed, accuracy, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Industrial Pumps & Compressors: For handling axial and radial loads in high-speed rotational systems.
- Robotics & Automation: High-accuracy rotary joints and arm assemblies.
