S71909 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71909 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71909 CDGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing from a universally matchable set, it excels in machine tool spindles and other precision equipment. Its core advantages include an exceptionally high limiting speed of 46,000 rpm, the ability to handle combined loads due to its 15° contact angle, and superior running accuracy ensured by its P4A tolerance class. The combination of a phenolic cage and ceramic balls makes it ideal for applications requiring minimal vibration, low heat generation, and extended service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71909 | Denotes the bearing series and size. 'S' often indicates a super-precision bearing series. |
| CD | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| GA | Indicates an Extra light preload (Class A). This preload ensures high rigidity and precise rotational accuracy. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls for reduced weight, lower friction, and higher speed capability. |
| P4A | Defines the tolerance class, which is superior to ABEC 7/ISO P4, ensuring extremely tight dimensional and running accuracy. |
S71909 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and enables a higher limiting speed. This design also offers improved resistance to wear and a longer operational life.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent guidance for the rolling elements, contributing to smooth operation, low noise, and high stability at ultra-high speeds.
- High Rigidity & Precision: The extra light preload (GA) eliminates internal clearance, resulting in superior shaft positioning accuracy and high rigidity, which is critical for machining precision.
- Superior Load Capacity: The angular contact design allows the bearing to support significant combined radial and axial loads simultaneously, making it versatile for complex load conditions.
- Pre-Greased for Immediate Use: The bearing is pre-lubricated with grease suitable for a wide temperature range (-30°C to 110°C), ensuring immediate startup and reliable performance.
S71909 CDGA/HCP4A Bearing Typical Application Areas
The S71909 CDGA/HCP4A is engineered for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring and testing equipment requiring minimal runout.
- High-Frequency Motors & Spindles: Motors for PCB drilling and other high-RPM applications.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other critical components.
