S71904 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71904 ACE/HCP4A Bearing Product Overview & Core Advantages
The S71904 ACE/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single-row bearing is engineered to accommodate combined loads, primarily handling high axial loads in one direction while also supporting significant radial loads. Its key advantages stem from its P4 (ABEC-7) tolerance class, ceramic balls, and phenolic cage, which collectively enable superior high-speed capability, reduced friction, and extended service life. The bearing is pre-lubricated and sealed, making it a robust, ready-to-install component for high-reliability systems.
S71904 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71904 ACE/HCP4A provides detailed technical specifications:
- S7: Indicates a series of high-precision, super-precision angular contact ball bearings.
- 1904: Denotes the size series; '19' for the series and '04' for a 20mm bore diameter.
- ACE: Specifies internal design features. 'A' indicates a 25° contact angle, optimized for high axial load capacity. 'C' and 'E' refer to internal clearance and enhancements for high-speed operation.
- HC: Stands for Hybrid Ceramic, signifying the use of ceramic balls with steel rings.
- P4A: Denotes the tolerance class P4 (ABEC-7), ensuring extremely tight dimensional and running accuracy for precision applications.
S71904 ACE/HCP4A Bearing Structural Features & Performance Benefits
The S71904 ACE/HCP4A's construction delivers distinct performance advantages:
- High-Speed Performance & Thermal Stability: The combination of ceramic balls (lower density, reduced centrifugal force) and a phenolic resin cage (lightweight and self-lubricating) significantly lowers friction and heat generation, enabling a high limiting speed of 60,000 rpm.
- High Rigidity & Load Capacity: The 25° contact angle and precision-ground raceways are optimized to handle substantial one-direction axial loads and radial loads simultaneously, providing excellent operational stiffness.
- Precision & Long Life: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration. The hybrid ceramic design offers superior resistance to wear and electrical erosion, dramatically increasing service life, especially in high-speed or contaminated environments.
- Preload & Sealed for Protection: The bearing is supplied with preload for immediate high-stiffness performance and is sealed to retain lubrication and exclude contaminants, ensuring consistent operation.
S71904 ACE/HCP4A Bearing Typical Application Areas
The S71904 ACE/HCP4A is ideally suited for high-performance applications where speed, precision, and reliability are critical. Key industries and equipment include:
- High-Frequency Spindles for CNC machining centers, grinding machines, and PCB drilling.
- Precision Instrumentation and medical devices.
- High-Speed Motors and turbo-molecular pumps.
- Aerospace & Defense systems requiring reliable, high-speed components.
