S71904 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71904 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S71904 CD/P4AQBCC is a high-precision metric angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing is engineered to provide superior stability and load-handling capabilities. Its key advantages include the ability to accommodate combined loads (radial and axial), high operational accuracy due to its P4A tolerance class, and optimized performance for high-speed operation. The phenolic cage and pre-lubrication contribute to its reliability and long service life in precision machinery.
Model Code Breakdown
- S71904: Basic model number denoting a 20mm bore, 37mm OD angular contact ball bearing.
- CD: Indicates a moderate preload (Class C) and a 15° contact angle.
- P4A: Specifies the tolerance class, indicating very high running accuracy.
- QBCC: Denotes the bearing is one of four in a Quadruplex Back-to-Back (QBC) matched set.
S71904 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The Quadruplex Back-to-Back (QBC) arrangement of four bearings creates an extremely rigid bearing system, ideal for applications where shaft deflection must be minimized.
Superior Load Capacity: The angular contact design and 15° contact angle enable the bearing to efficiently handle combined radial and axial loads.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, allowing for a high limiting speed of 75,000 rpm. The pre-applied grease lubrication is formulated for stable performance at these high rotational speeds.
Precision and Accuracy: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures precise running accuracy and minimal vibration.
Sealed and Lubricated for Life: The bearing is sealed and pre-lubricated with grease, making it ready for installation and suitable for applications where re-lubrication is not feasible.
S71904 CD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Robotic Drives and Actuators
- High-Speed Pumps and Compressors
