71905 ACD/P4ATGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACD/P4ATGA
Basic Information
System of measurement
Metric
Weight
0.13 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
27 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°C to 110 °C
Radial dynamic load rating
3105 lbf
Radial static load rating
2565 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
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
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71905 ACD/P4ATGA Bearing Product Overview & Core Advantages
The 71905 ACD/P4ATGA is a precision angular contact ball bearing manufactured to P4A tolerance class, delivering exceptional rotational accuracy and performance. Engineered with an Extra Light preload (Class A) and a 25° contact angle, it is optimized for applications requiring high rigidity and precise shaft positioning. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, making it a versatile and highly reliable solution for demanding high-speed spindle and precision machinery applications.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD, 27mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a Universal Matchable (SU) bearing, designed to be paired in sets. |
| P4A | Indicates a high-precision tolerance class for superior running accuracy. |
| TGA | Specifies the Phenolic (resin) cage material, ideal for high-speed operation. |
71905 ACD/P4ATGA Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The angular contact design combined with P4A precision tolerances and Class A preload ensures minimal axial and radial play, providing exceptional system stiffness and accurate shaft guidance.
- Optimized for Combined Loads: With a 25° contact angle, this bearing efficiently supports combined radial and axial loads simultaneously, making it suitable for complex loading conditions.
- Superior High-Speed Performance: The lightweight phenolic cage (TGA) reduces centrifugal forces, enabling a high limiting speed of 53,000 rpm. The open design allows for efficient lubrication management in high-speed systems.
- Universal Matching Capability: The Universal Matchable (SU) feature allows multiple bearings to be mounted together in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to achieve specific preload and rigidity requirements.
71905 ACD/P4ATGA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving machines, and high-frequency motors.
- Industrial Pumps and Compressors: Where high rotational accuracy and reliability are critical.
- Robotics and Automation: High-precision joints and servo drives.
