71805 CD/P4QBCA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71805 CD/P4QBCA
Basic Information
System of measurement
Metric
Weight
0.084 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2498 lbf
Radial static load rating
2858 lbf
Limiting speed
103 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
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
Price available upon request.
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71805 CD/P4QBCA Bearing Product Overview & Core Advantages
The 71805 CD/P4QBCA is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a quadruplex back-to-back (QBC) matched set, it delivers exceptional system rigidity and rotational accuracy. Its P4 tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other machinery requiring maximum performance. The bearing is pre-lubricated and features an open design for optimal lubrication management in controlled environments.
71805 CD/P4QBCA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71805 CD/P4QBCA is decoded as follows:
- 71805: Basic bearing series, indicating a 25mm bore, 37mm OD, and angular contact design.
- CD: Internal design code specifying a 15° contact angle and optimized internal geometry.
- P4: Tolerance class, denoting superior dimensional and running accuracy beyond standard ABEC-7.
- QBCA: Quadruplex Back-to-Back (QBC) arrangement, Class A preload. This signifies a set of four bearings matched for optimal performance when mounted in a back-to-back configuration.
71805 CD/P4QBCA Bearing Structural Features & Performance Benefits
- Ultra-High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system capable of withstanding combined loads (radial and axial) from both directions, making it exceptionally stable under complex loading conditions.
- Super-Precision Performance: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finishes and machining accuracy.
- Optimized for High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, while the 15° contact angle is ideal for high-speed applications, contributing to a high limiting speed.
- Matched Set Consistency: The four bearings are precision-matched as a set (QBCA), ensuring uniform load distribution and predictable performance, eliminating the guesswork from assembly.
71805 CD/P4QBCA Bearing Typical Application Areas
This bearing is engineered for high-performance 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
- Medical and Dental Equipment Spindles
