71905 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACD/P4ADBC
Basic Information
System of measurement
Metric
Weight
0.084 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
18 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
2340 lbf
Radial static load rating
1721 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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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Product Overview and Core Advantages
The 71905 ACD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set is preloaded to Moderate / Class C specifications, delivering superior system stiffness and minimal runout. Its P4A tolerance class ensures ultra-precision performance, making it ideal for high-speed spindles and other precision machinery where high rigidity and stability under combined loads are critical.
71905 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Duplex Back-to-Back (DB) matched set. |
| P4A | Denotes a high-precision tolerance class for exceptional dimensional and running accuracy. |
| DBC | Specifies the moderate preload (Class C) applied to the duplex set. |
Structural Features and Performance Benefits
- Enhanced Rigidity and Stability: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection, providing exceptional operational stability.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined loads, including radial and axial loads in both directions.
- High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, contributing to the bearing's high limiting speed of 53,000 rpm. The open design allows for efficient lubrication management.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls, this bearing ensures low noise, low vibration, and high rotational accuracy.
- Durable Construction: Made from chrome steel for both rings and balls, the bearing offers high fatigue life and reliability in demanding operating conditions.
71905 ACD/P4ADBC Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Robotics and Automation
- Medical and Dental Equipment Spindles
- Aerospace Actuation Systems
