S71928 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71928 ACD/P4A
Basic Information
System of measurement
Metric
Weight
1.69 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.011mm 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° to 110 °C
Radial dynamic load rating
20340 lbf
Radial static load rating
24750 lbf
Limiting speed
6 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 2417.84
/ each
In Stock
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S71928 ACD/P4A Bearing Product Overview & Core Advantages
The S71928 ACD/P4A is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it is optimized to handle significant combined loads—both radial and axial—in one direction. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
S71928 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact bearings. |
| 1928 | Standard size designation: 140mm bore, 190mm OD, 24mm width. |
| ACD | Contact angle of 25° and optimized internal design for high stiffness. |
| P4A | Indicates a P4 (ABEC-7) tolerance class with specific accuracy and running performance requirements. |
S71928 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and robust internal geometry provide high resistance to deformation under combined radial and axial loads, ensuring stable operation and extended service life.
- Precision High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at the limiting speed of 6,000 rpm. The P4 tolerance minimizes vibration and heat generation.
- Optimized Internal Design: With 29 high-precision chrome steel balls of 15.875mm diameter, the bearing achieves balanced load distribution and smooth rotation.
- Sealed and Lubricated for Reliability: The sealed design with factory-applied lubrication protects against contamination and provides maintenance-free operation within the specified temperature range of -30°C to 110°C.
S71928 ACD/P4A Bearing Typical Application Areas
This bearing is engineered for demanding applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motors and servo drives.
- Aerospace Equipment: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Machinery: Dental handpieces and high-speed imaging equipment.
