S71904 CE/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71904 CE/P4AQBCA Bearing Product Overview & Core Advantages
The S71904 CE/P4AQBCA 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. This bearing is engineered to handle combined radial and axial loads simultaneously, making it ideal for high-speed spindles and other precision machinery where maximum stability and minimal runout are critical. Its P4A tolerance class and extra light preload (Class A) ensure superior performance in high-precision environments.
S71904 CE/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings |
| 1904 | Bore size: 20mm, Outside diameter: 37mm, Width: 36mm |
| CE | Contact angle of 15° |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
S71904 CE/P4AQBCA Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The Quadruplex Back-to-Back (QBC) arrangement of four matched bearings provides maximum system stiffness, effectively resisting moment loads and ensuring stable operation under heavy cutting forces.
High-Speed Capability: Featuring a phenolic resin cage and optimized internal geometry, this bearing achieves a limiting speed of 75,000 rpm, making it suitable for high-speed machining applications.
Superior Load Capacity: With a 15° contact angle and precision-ground components, the bearing efficiently handles combined radial and axial loads, offering a dynamic load rating of 2925 lbf and static load rating of 2138 lbf.
Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures minimal runout and vibration for superior machining quality.
Sealed & Lubricated Design: The sealed construction with factory-applied grease provides contamination protection and long-term lubrication, suitable for operating temperatures from -30°C to 110°C.
S71904 CE/P4AQBCA Bearing Typical Application Areas
This high-precision bearing is specifically designed for applications requiring extreme accuracy and high-speed performance:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Robotics - High-accuracy robotic arms and positioning systems
- Medical Equipment - Dental handpieces, surgical tools, and imaging systems
- Aerospace Components - Guidance systems and precision actuators
- Semiconductor Manufacturing - Wafer handling and processing equipment
