71907 CD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 CD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
0.3 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
5738 lbf
Radial static load rating
5850 lbf
Limiting speed
56 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
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71907 CD/P4AQBCB Bearing Product Overview & Core Advantages
The 71907 CD/P4AQBCB is a high-precision angular contact ball bearing configured in a quadruplex back-to-back (QBC) arrangement. This matched set is engineered to deliver exceptional system rigidity and handle complex combined loads, including significant radial and bidirectional axial forces. Manufactured to P4A tolerance class, it guarantees superior running accuracy, making it ideal for applications demanding the highest levels of precision and reliability. The light preload (Class B) ensures optimal performance from startup, minimizing deflection and vibration.
71907 CD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71907 CD/P4AQBCB contains specific technical designations:
- 71907: The basic bearing designation, indicating a lightweight series, angular contact bearing with a 35mm bore and 55mm outside diameter.
- CD: Signifies a 15° contact angle, optimized for high-speed operation while maintaining good axial load capacity.
- P4A: Denotes an ultra-precision tolerance class with specific running accuracy requirements, exceeding standard ABEC 7 (P4) levels.
- QBC: Indicates the bearing is supplied as part of a Quadruplex Back-to-Back matched set of four bearings.
- Open / Lubricated: The bearing is supplied open (unsealed) and is pre-lubricated from the factory.
71907 CD/P4AQBCB Bearing Structural Features & Performance Benefits
- Superior Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system, effectively resisting moment loads and providing stable shaft support. This configuration significantly enhances the combined load rating of the assembly.
- High-Speed Capability: The 15° contact angle (CD) and phenolic resin cage are optimized for high-speed applications, contributing to a low friction moment and a high limiting speed of 56,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with strict bore, outside diameter, and width tolerances, this bearing ensures minimal runout and superior rotational accuracy for precise machinery operation.
- Optimized Design: The use of 21 high-grade chrome steel balls of 5.556mm diameter ensures smooth operation and contributes to the high dynamic and static load ratings.
71907 CD/P4AQBCB Bearing Typical Application Areas
This precision-matched bearing set is specifically designed for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring maximum rigidity and accuracy.
- Precision Grinding Spindles: Applications where minimal runout and thermal stability are critical.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Advanced Robotic Systems: Critical joints and actuators where precision and stiffness are paramount.
