7218 ACD/P4ADGB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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Materials
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7218 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADGB is a precision double row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. Designed to simultaneously handle combined loads (radial and bidirectional axial loads), this bearing is ideal for high-speed, high-precision machinery. Its universal matchable (SU) design allows for flexible mounting arrangements, while the P4A tolerance class ensures superior running accuracy. The combination of a phenolic cage and optimized internal geometry contributes to its outstanding high-speed performance and operational stability.
7218 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7218 | Basic bearing series and size designation | Indicates a 90mm bore, 160mm OD, and 60mm width |
| ACD | 25° contact angle, double row design | Optimized for handling combined radial and axial loads |
| P4A | High precision tolerance class | Superior dimensional and running accuracy for precision applications |
| DGB | Universal matchable (SU) arrangement, light preload (Class B) | Allows for flexible mounting configurations with optimized preload |
7218 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row angular contact design with a 25° contact angle provides exceptional stiffness and enables the bearing to handle significant combined loads. With a dynamic load rating of 44,775 lbf and static load rating of 47,700 lbf, it offers robust performance in demanding applications.
Optimized High-Speed Performance: The phenolic cage and precision-ground chrome steel components enable a limiting speed of 17,000 rpm. The optimized internal geometry and 16 high-quality balls (22.225mm diameter) ensure smooth operation at high rotational speeds.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing delivers exceptional running accuracy. The universal matchable (SU) design simplifies installation and ensures optimal performance in various mounting configurations.
Material Excellence: Constructed from high-grade chrome steel for both rings and balls, the bearing offers excellent durability and wear resistance, suitable for a temperature range of -30°C to 110°C.
7218 ACD/P4ADGB Bearing Typical Application Areas
The 7218 ACD/P4ADGB is ideally suited for precision applications requiring high speed, accuracy, and rigidity:
- Machine Tool Spindles - High-precision machining centers and grinding spindles
- High-Speed Industrial Pumps - Centrifugal pumps and turbine pumps
- Precision Gearboxes - Industrial transmission systems
- Robotics & Automation - High-accuracy robotic joints and positioning systems
- Aerospace Components - Aircraft auxiliary systems and precision mechanisms
- Medical Equipment - High-speed dental handpieces and imaging systems
