SKey stands for Symbol Key. It is a unique alphanumeric code assigned to a specific 3D component (like a valve, elbow, or gasket) in the plant 3D model.
Never redraw. Use the ISO Symbol Editor -> Export / Import functionality.
To master SKEYs, you must understand their three primary habitats: autocad plant 3d iso symbol skey
| Location | File Type | Role |
| :--- | :--- | :--- |
| 3D Model Part | .pcat / .xml | Stores the Skey property for the component. |
| IsoConfig.xml | XML | The master lookup table. Maps SKEYs to block names, symbol types, and annotation rules. |
| Symbol Block Library | .dwg | The actual 2D geometry (lines, polylines, hatches) representing the component on the isometric. |
If you work internationally, the default ASME/ANSI symbols (default in Plant 3D) may not work. A German client might want DIN symbols (which look different). A Japanese client might want JIS piping symbols. SKey stands for Symbol Key
This is where custom SKEYs become mandatory.
Click "Save Symbol" (Disk icon). Your MAG block is now saved inside the IsoSymbols.dwg for that project. Click "Save Symbol" (Disk icon)
Log message: Block 'XYZ' not found in IsoSymbols.dwg.
Fix: You mapped the SKEY, but the block name doesn't exist in the DWG file. Double-check the block name spelling (case sensitive).
Go back to your Spec Editor or Project Setup. Find your Magnetic Flow Meter part. Change its SKEY property to MAG. Regenerate the ISO.