7218 CDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7218 CDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered with P4A tolerance class and light preload (Class B), this bearing delivers superior performance in high-speed spindle systems. Its 15° contact angle and optimized internal geometry enable it to handle significant combined loads (radial and axial) simultaneously, making it ideal for machine tool applications where precision and reliability are critical.
7218 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing series with 90mm bore, 160mm OD, 30mm width |
| CD | 15° contact angle design optimized for high-speed operation |
| GB | Universal Matchable (SU) bearing for paired mounting arrangements |
| P4A | Ultra-precision tolerance class with enhanced running accuracy |
Structural Features and Performance Benefits
High Precision Construction: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration.
Optimized Internal Design: Features 16 high-precision chrome steel balls with 22.225mm diameter arranged in a 15° contact angle configuration, providing excellent load distribution and high rigidity.
Superior Material Selection: Utilizes phenolic cage material that offers excellent strength-to-weight ratio and reduced friction, contributing to the limiting speed of 15,000 rpm.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings that can be paired in sets of 2 for back-to-back (DB) or face-to-face (DF) arrangements, enabling precise preload control and enhanced system stiffness.
7218 CDGB/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision milling applications
- Precision Industrial Equipment: High-speed pumps, compressors, and specialized machinery requiring ultra-precision
- Aerospace Components: Gyroscopes, navigation systems, and other critical rotational systems
- Medical Equipment: High-speed dental handpieces, laboratory centrifuges, and diagnostic imaging systems
- Robotics and Automation: Precision robotic joints and high-accuracy positioning systems
