7218 ACD/P4ADGC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7218 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADGC is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional rigidity and accuracy. This universal matchable bearing is designed to accommodate combined radial and axial loads simultaneously, making it ideal for high-speed spindles and precision machinery. Manufactured to P4A tolerance class and featuring a moderate preload (Class C), it delivers superior rotational accuracy, smooth operation, and enhanced system stability. Its optimized internal geometry and phenolic cage contribute to its outstanding high-speed performance and reliability.
7218 ACD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for high rigidity and thrust capacity. |
| P4A | Indicates a high-precision tolerance class with enhanced running accuracy requirements. |
| DGC | Signifies a Universal Matchable (SU) bearing, supplied as a set of two bearings (DB/DF arrangement) pre-set for immediate installation. |
7218 ACD/P4ADGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design and 25° contact angle provide significantly increased radial and axial stiffness compared to single row bearings, enabling stable operation under combined loads. With a dynamic load rating of 44,775 lbf and static load rating of 47,700 lbf, it handles heavy-duty applications with ease.
High-Speed Performance: The lightweight phenolic cage ensures excellent dimensional stability and low friction at high rotational speeds, supporting a limiting speed of 17,000 rpm. This makes it suitable for high-speed spindle applications.
Precision & Stability: Manufactured to P4A tolerance class with strict dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing guarantees minimal runout and vibration. The moderate preload (Class C) eliminates internal clearance, enhancing system rigidity and positioning accuracy.
Universal Matchability: As a Universal Matchable (SU) bearing supplied in a set of two, it can be mounted in various configurations (back-to-back, face-to-face, or tandem) without requiring selective matching, simplifying installation and inventory management.
7218 ACD/P4ADGC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity.
- Precision Gearboxes: Industrial transmissions and reducers demanding high load capacity and accuracy.
- High-Frequency Motors: Spindles for CNC machining and high-speed automation equipment.
- Industrial Pumps & Compressors: Applications with combined radial and axial loads.
- Robotic Arms & Precision Positioning Systems: Where high rigidity and rotational accuracy are critical.
