S71908 CD/HCP4ADGA
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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S71908 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The S71908 CD/HCP4ADGA is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and rigidity. Its double row design enables it to support substantial combined loads—simultaneous radial and bidirectional axial loads—within a compact cross-section. Manufactured to the stringent P4A tolerance class and featuring a phenolic cage and ceramic balls, this bearing is optimized for high-speed operation and delivers superior performance in high-reliability scenarios.
S71908 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7 | Bearing Series | Indicates a high-precision angular contact bearing series. |
| 1908 | Bore & Series Code | Specifies the bore diameter (40 mm) and cross-sectional dimensions. |
| CD | Contact Angle & Design | Denotes a 15° contact angle and optimized internal geometry for high rigidity. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls, which reduce friction, heat generation, and allow for higher speeds. |
| P4A | Tolerance Class | Specifies ultra-high precision tolerances for running accuracy, exceeding ABEC 7. |
| DGA | Sealed & Greased | Indicates the bearing is sealed and pre-lubricated with high-performance grease for long service life. |
S71908 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The double row angular contact configuration provides a rigid support system, significantly increasing the bearing's ability to handle combined loads and moment loads compared to single row designs.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls minimizes centrifugal forces, reduces friction, and enables a high limiting speed of 41,000 rpm. This makes it an ideal high-speed bearing.
Enhanced Durability and Longevity: Ceramic balls are electrically resistant, harder, and have a lower coefficient of thermal expansion than steel, leading to reduced wear, extended lubricant life, and improved reliability in challenging environments.
Maintenance-Free Operation: As a sealed and pre-greased unit, the bearing is protected from contamination and is lubricated for life under normal operating conditions, reducing maintenance requirements.
S71908 CD/HCP4ADGA Bearing Typical Application Areas
The S71908 CD/HCP4ADGA is designed for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Instrumentation: In medical devices, optical scanners, and coordinate measuring machines.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small turbochargers.
- Aerospace and Defense Systems: In gyroscopes, navigation systems, and other critical control mechanisms.
