71905 ACD/P4AQBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACD/P4AQBTC
Basic Information
System of measurement
Metric
Weight
0.17 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
36 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
3780 lbf
Radial static load rating
3442 lbf
Limiting speed
53 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
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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71905 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The 71905 ACD/P4AQBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This quadruplex matched set features a tandem back-to-back (QBT) arrangement, enabling it to withstand significant combined loads while providing maximum axial rigidity. Manufactured to P4A tolerance class and preloaded to Moderate / Class C, it delivers high running accuracy and is optimized for high-speed operation up to 53,000 rpm. Its compact design and phenolic cage make it an ideal choice for high-performance spindles and precision machinery.
71905 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior running accuracy. |
| QBT | Identifies this as a Quadruplex (4-bearing) set in a Tandem Back-to-Back arrangement. |
| C | Indicates the Moderate preload applied to the bearing set for optimal stiffness and minimal deflection. |
71905 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex QBT arrangement creates an extremely rigid bearing system, critical for applications where shaft deflection must be minimized under heavy combined loads.
- High Load Capacity: The 25° contact angle and four-bearing configuration provide a high radial dynamic load rating of 3780 lbf and a radial static load rating of 3442 lbf, enabling reliable performance under significant stress.
- Optimized High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel components reduce centrifugal forces and friction, allowing for a high limiting speed of 53,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, this bearing ensures smooth, vibration-free operation essential for precision applications.
71905 ACD/P4AQBTC Bearing Typical Application Areas
This bearing is specifically engineered for high-end machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Machining Centers
- Advanced Robotic Drives
- Aerospace Actuation Systems
