S71905 ACD/P4A
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71905 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.043 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.006mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1433 lbf
Radial static load rating
855 lbf
Limiting speed
34 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:
$ 212.41
/ each
In Stock
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S71905 ACD/P4A Bearing Product Overview & Core Advantages
The S71905 ACD/P4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it is optimized to handle combined loads, supporting significant axial loads in one direction alongside radial loads. Its P4 (ABEC-7) tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other high-precision machinery. The bearing comes preloaded and pre-lubricated, offering immediate high performance and high rigidity from installation.
S71905 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1905 | Standard size designation (Bore: 25mm, OD: 42mm, Width: 9mm). |
| ACD | Contact angle of 25° and a specific internal design optimized for high-speed operation. |
| P4A | Indicates a P4 tolerance class (equivalent to ABEC-7) with specific accuracy and running precision requirements. |
S71905 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a phenolic resin cage, this bearing provides exceptional dimensional stability and minimal runout, which is critical for high-precision applications.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support combined loads, offering superior axial load capacity in one direction while maintaining excellent radial load performance.
- High-Speed Performance: The lightweight and robust phenolic cage minimizes centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm. The standard lubrication further supports reliable high-speed operation.
- Sealed and Lubricated for Life: As a sealed bearing that is pre-lubricated, it is protected from contamination and is ready for use, offering long service life with minimal maintenance in clean environments.
S71905 ACD/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance equipment requiring precision and speed, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Medical and Dental Handpieces
- Semiconductor Manufacturing Equipment
