7218 ACD/P4ADGD
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7218 ACD/P4ADGD Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADGD is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional rigidity and accuracy. Designed with a 25° contact angle and Heavy preload (Class D), this bearing delivers superior performance under combined radial and axial loads. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs, while the P4A tolerance class ensures ultra-precision operation. The phenolic cage and optimized internal geometry contribute to its high-speed capabilities, making it ideal for machine tool spindles and other high-performance rotational systems.
7218 ACD/P4ADGD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 7218 | Basic bearing designation (90mm bore × 160mm OD × 60mm width) |
| ACD | Double Row Angular Contact Design with 25° contact angle |
| P4A | Ultra-precision tolerance class with enhanced running accuracy |
| DGD | Heavy preload (Class D) for maximum rigidity and stability |
7218 ACD/P4ADGD Bearing Structural Features & Performance Benefits
Enhanced Rigidity: The double row design with heavy preload provides exceptional stiffness, minimizing deflection under heavy cutting forces and ensuring precise machining operations.
Superior Load Capacity: Engineered to handle combined radial and axial loads simultaneously, with a radial dynamic load rating of 44,775 lbf and static load rating of 47,700 lbf.
High-Speed Performance: The phenolic cage and optimized internal geometry enable operation at limiting speeds up to 17,000 rpm, while maintaining thermal stability.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for ultra-precise applications.
Universal Matching Capability: The SU designation allows for flexible mounting in universal arrangements, simplifying installation and maintenance in complex spindle designs.
7218 ACD/P4ADGD Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, CNC milling machines, and grinding spindles
- Precision Industrial Equipment: High-frequency spindles, precision grinders, and boring machines
- Robotics & Automation: High-precision robotic joints and articulated arms requiring rigid support
- Aerospace Components: Aircraft accessory drives and precision positioning systems
- Medical Equipment: High-speed dental handpieces and surgical tool drives
