7218 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7218 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 7218 ACD/HCP4ADGA is a precision double row angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. This bearing is distinguished by its universal matchable (SU) design, allowing two bearings to be paired in any combination to achieve the required preload and rigidity. Its core advantage lies in its ability to simultaneously support combined loads (radial and bidirectional axial loads) with high precision. Manufactured to the stringent P4A tolerance class and featuring a phenolic cage with ceramic balls, it is optimized for high-speed operation and offers superior performance in demanding environments.
7218 ACD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7218 | Basic bearing series, indicating a bore diameter of 90 mm, outside diameter of 160 mm, and width of 60 mm. |
| ACD | Designates a 25° contact angle and a specific internal design optimized for high rigidity. |
| HCP4A | Indicates the P4A tolerance class (higher than ABEC 7/ISO P4) for exceptional dimensional and running accuracy, and a phenolic (resin) cage. |
| DGA | Signifies a Universal Matchable (SU) bearing, supplied as one of a pair (2 bearings in a set) that can be universally matched. |
7218 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The double row angular contact design provides a rigid support system, capable of handling significant combined radial and axial loads from both directions. The 25° contact angle is optimized for sustaining high axial loads.
High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 17,000 rpm. This makes it an ideal high-speed bearing.
Precision and Longevity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The use of ceramic balls offers advantages such as reduced wear, lower heat generation, and extended service life, especially in lubricated conditions within its specified temperature range.
Matched Set Flexibility: The Universal Matchable (SU) feature allows for flexible mounting arrangements. Two bearings can be paired in any combination (face-to-face, back-to-back, or tandem) to achieve the precise preload and stiffness required by the application.
7218 ACD/HCP4ADGA Bearing Typical Application Areas
The 7218 ACD/HCP4ADGA is designed for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: In robotics, aerospace, and other high-tech industries.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational accuracy are critical.
- Medical Equipment: Such as high-speed dental handpieces and imaging devices.
- Pumps and Compressors: For handling significant axial and radial loads efficiently.
