S71918 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71918 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71918 CDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This matched bearing set (Universal Matchable SU) consists of two bearings pre-configured for optimal performance. Its core advantages include the ability to handle combined loads (radial and axial) simultaneously, superior high-speed capability facilitated by a phenolic cage and ceramic balls, and outstanding operational precision due to its P4A tolerance class. The sealed design with pre-applied grease ensures long-term reliability and minimal maintenance.
Model Code Breakdown
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| S71918 | Bearing series and size designation (90mm bore, 125mm OD, 18mm width) | Defines the core bearing dimensions. |
| CD | 15° contact angle | Optimized for high-speed applications and axial load capacity. |
| GA | Matched set, pre-loaded with extra light (Class A) preload | Ensures high rigidity and precise shaft positioning. |
| HCP4A | Phenolic cage (HC), P4A tolerance class | Enables very high rotational speeds and provides superior running accuracy. |
S71918 CDGA/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The Universal Matchable (SU) pair, pre-loaded with an extra light (Class A) preload, creates a highly rigid bearing system that minimizes deflection under load, making it ideal for precision spindles. The P4A tolerance class ensures extremely tight dimensional and running accuracy.
Superior High-Speed Performance: The combination of a lightweight phenolic cage (HCP4A) and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and allows for a very high limiting speed of 15,000 rpm. The 15° contact angle is optimized for such high-speed operations.
Enhanced Load Capacity and Longevity: The bearing is designed to handle significant radial dynamic load (10,688 lbf) and static load (11,475 lbf). The sealed construction protects against contamination, and the pre-applied grease provides effective lubrication within the specified temperature range of -30°C to 110°C, contributing to a long, maintenance-free service life.
S71918 CDGA/HCP4A Bearing Typical Application Areas
This high-performance precision bearing is engineered for advanced applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: High-accuracy measuring and testing equipment.
- High-Frequency Motors and Spindles: Motors for CNC machinery and robotics.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and other critical components.
