71905 CD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CD/P4AQBCB
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
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4005 lbf
Radial static load rating
3600 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Light / Class B
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
Price available upon request.
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71905 CD/P4AQBCB Bearing Product Overview & Core Advantages
The 71905 CD/P4AQBCB is a super-precision angular contact ball bearing designed for the most demanding applications. Its primary advantage lies in its Quadruplex Back-to-Back (QBC) matched arrangement, which delivers exceptional system rigidity and stability under complex loading conditions. Manufactured to a P4A tolerance class, this bearing ensures ultra-high running accuracy and is pre-lubricated for immediate use, making it an ideal solution for high-speed spindles and precision machinery requiring uncompromising performance.
71905 CD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation, indicating a super-precision angular contact bearing series with a 25 mm bore. |
| CD | Indicates a 15° contact angle and specific internal design optimized for high-speed operation. |
| P4A | Denotes an ABEC 7 / P4 precision class with enhanced dimensional and running accuracy tolerances. |
| QBC | Signifies a Quadruplex Back-to-Back matched set of four bearings, pre-configured for maximum rigidity. |
| B | Specifies a Light preload applied to the bearing set, eliminating internal clearance for precise shaft positioning. |
71905 CD/P4AQBCB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely stiff bearing system that effectively resists moment loads and minimizes shaft deflection, which is critical for maintaining machining accuracy.
- High-Speed Capability: The combination of a 15° contact angle, a lightweight and durable phenolic cage, and precision-ground chrome steel components allows for a high limiting speed of 100,500 rpm.
- Precision Performance: Manufactured to P4A tolerance class standards, this bearing guarantees minimal runout and vibration, ensuring superior performance in high-precision applications.
- Optimized Load Capacity: The angular contact design enables the bearing to support significant combined loads (radial and axial) simultaneously, with a dynamic load rating of 4005 lbf.
- Ready-to-Install: The bearing is pre-lubricated, simplifying installation and ensuring immediate, reliable operation upon startup.
71905 CD/P4AQBCB Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Frequency CNC Machining Spindles
- Precision Grinding Spindles
- High-Speed Router and Milling Machine Spindles
- Advanced Dental and Medical Equipment Spindles
- Precision Test and Measurement Equipment
