7218 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
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7218 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7218 CD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universal matchable (SU) bearing features a P4A tolerance class and ceramic balls, delivering superior high-speed capability and rigidity. Its 15° contact angle and extra light preload (Class A) enable it to handle combined loads efficiently while maintaining precision. The open design with phenolic cage and specialized lubrication makes it ideal for high-reliability, precision machinery.
7218 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 7218 | Standard bore diameter (90mm), outside diameter (160mm), and width (60mm) | Standard bearing dimensions for easy integration |
| CD | Universal matchable bearing design (SU) | Enables flexible mounting arrangements and optimized load distribution |
| HC | Hybrid ceramic balls | Enhanced high-speed performance, reduced friction, and longer service life |
| P4A | High precision tolerance class | Exceptional running accuracy and minimal vibration |
| DGA | Contact angle designation (15°) | Optimized for combined radial and axial loads |
7218 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, enabling limiting speeds up to 17,000 rpm while maintaining dimensional stability.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration in precision applications.
Optimized Load Capacity: The 15° contact angle and universal matchable design provide superior handling of combined loads, with dynamic load rating of 46,800 lbf and static load rating of 50,400 lbf.
High-Speed Phenolic Cage: The phenolic resin cage ensures reliable operation at high speeds while providing excellent dimensional stability and reduced weight.
Thermal Performance: Operating temperature range of -30°C to 110°C with specialized lubrication ensures consistent performance across varying thermal conditions.
7218 CD/HCP4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and precision grinding machines
- Precision Instrumentation: Measuring equipment and laboratory instruments requiring exceptional accuracy
- Aerospace Systems: Guidance systems and aircraft instrumentation
- Medical Equipment: High-speed dental handpieces and surgical tools
- Semiconductor Manufacturing: Wafer processing equipment and precision positioning systems
- Robotics: High-precision robotic joints and positioning arms
