7218 ACD/P4ADGA
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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7218 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 7218 ACD/P4ADGA is a precision angular contact ball bearing manufactured to P4A tolerance class for exceptional dimensional and running accuracy. Engineered to handle combined loads with high reliability, this bearing features a 25° contact angle optimized for significant axial load capacity in one direction while accommodating radial loads. Its extra light preload (Class A) ensures minimal friction and smooth operation, making it ideal for applications demanding high rotational accuracy and rigidity. The universal matchable (SU) design allows for flexible mounting arrangements in pairs to support bidirectional axial loads.
7218 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class exceeding ABEC 7 standards |
| DGA | Universal Matchable (SU) bearing for duplex arrangements |
7218 ACD/P4ADGA Bearing Structural Features & 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 dimensional stability.
Optimized Load Capacity: With a dynamic load rating of 44,775 lbf and static load rating of 47,700 lbf, this bearing delivers reliable performance under demanding combined radial and axial loads.
Enhanced Speed Performance: The phenolic cage and optimized internal design enable a limiting speed of 17,000 rpm, suitable for high-speed applications.
Superior Material Quality: Constructed from chrome steel for both rings and balls (22.225 mm diameter), providing excellent wear resistance and durability.
Thermal Stability: Operating temperature range of -30°C to 110°C ensures consistent performance across various environmental conditions.
7218 ACD/P4ADGA Bearing Typical Application Areas
Machine Tool Spindles: High-precision machining centers requiring exceptional rotational accuracy and rigidity
Precision Grinding Spindles: Applications demanding minimal runout and vibration
High-Speed Motors: Electric motors and generators operating at elevated speeds
Aerospace Systems: Flight control systems and auxiliary power units
Medical Equipment: High-speed dental handpieces and surgical tools
Robotic Joints Precision robotics and automation systems requiring accurate positioning
