S71904 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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S71904 CD/HCP4A Bearing Product Overview & Core Advantages
The S71904 CD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy, rigidity, and speed. As a single-row bearing, it is designed to accommodate high combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its defining characteristics include a P4 (ABEC-7) tolerance class for superior running accuracy, a phenolic resin cage optimized for high-speed performance, and ceramic balls that reduce centrifugal forces and enable higher limiting speeds. This combination makes it an ideal solution for high-reliability, high-performance machinery.
S71904 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1904 | Bore diameter code (20 mm) and series size identifier. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| D | Indicates a preload is applied, enhancing system rigidity and rotational accuracy. |
| HC | Hybrid Ceramic construction, signifying ceramic balls and steel rings. |
| P4A | Denotes the P4 (ABEC-7) tolerance class, ensuring extremely tight dimensional and running accuracy. |
S71904 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces weight and centrifugal force, lowers operating temperature, and extends bearing life, especially at very high speeds.
- High Rigidity & Preload: The applied preload (D) eliminates internal clearance, resulting in superior shaft positioning accuracy and increased system stiffness, which is critical for minimizing deflection under load.
- Superior High-Speed Capability: The combination of the lightweight phenolic cage, 15° contact angle, and ceramic balls allows for a very high limiting speed of 53,000 rpm.
- Precision Engineering: Manufactured to P4 tolerance with tight dimensional control on the bore diameter, outside diameter, and width, ensuring consistent, high-performance operation.
- Sealed & Lubricated: The sealed design with factory-applied lubrication protects against contamination and provides long-term, maintenance-free operation within the specified temperature range.
S71904 CD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Instruments: Measuring devices, optical scanners.
- High-Speed Motors: Spindles for PCB drilling, dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, navigation equipment.
- Semiconductor Manufacturing Equipment: Wafer handling robots.
