Overview
| Location | File Type | Role | | :--- | :--- | :--- | | | .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. |
A valve in your model has Symbol Type = VALVE and SKEY = VABW .
Before you edit SKEYs, you must know where the engine looks. There are two critical files: autocad plant 3d iso symbol skey
This is the database (often an XML file or accessed via the Project Setup dialog) that manages the relationships. It maps the SKey to specific symbol names.
When you add a component to a Spec, the SKEY travels with it. Usually, this is invisible to the user, but if you open the Spec Editor and look at the list view or the component properties, you can verify the SKEY is present.
For many AutoCAD Plant 3D users, the SKEY (Symbol Key) remains a black box. It is often understood as just another data field in a spec, but in reality, it is the fundamental language that translates your 3D model into a 2D fabrication drawing. Overview | Location | File Type | Role
Define the type of component (e.g., VA for Valve, EL for Elbow, FL for Flange).
Appendix: Quick reference table (example)
Author’s Note: SKEY behavior can vary between Plant 3D versions (2018 vs 2025). Always test custom symbols in your specific version. | | Symbol Block Library |
By learning to edit IsoSymbols.dwg and manipulate IsoSkeyAcadBlockMap.xml , you unlock total control over your isometric output. Whether you need to represent a control valve with a specific actuator, a reducer with eccentric alignment, or a specialty chemical injection quill—the SKEY is your tool.
In the world of AutoCAD Plant 3D, an Isometric drawing is not merely a visual representation; it is a database-driven extraction of the 3D model. At the heart of this extraction process lies a seemingly simple, yet profoundly critical, four-to-six-character code: the .
in the mapping file to group similar SKEYs under one symbol. For instance, might map both (Elbow Socket Weld) and (Elbow Butt Weld) to the same "Elbow" block. Creating and Assigning Custom Symbols
Some configurations use question marks as single-character wildcards, allowing flexible mapping for end conditions. How to Customize SKEYs and Iso Symbols
Once an SKEY is set in the catalog, you must ensure the system knows how to draw it. Here is the step-by-step process to build the visual representation for that SKEY.