Lineweight in AutoCAD is the thickness assigned to lines in a drawing.
It helps improve the clarity, readability, and appearance of printed and plotted drawings.
Different lineweights are used to distinguish visible edges, hidden lines, centerlines, and dimensions.
In AutoCAD, there is no single universal “standard” lineweight, but many drafting offices follow common conventions. The default AutoCAD lineweight is:
Default lineweight: 0.25 mm (often displayed as Default in Layer Properties)
A typical architectural/engineering lineweight setup might be:
| Drawing element | Common lineweight |
|---|---|
| Object outlines / cut lines | 0.50 mm – 0.70 mm |
| Major boundaries | 0.35 mm – 0.50 mm |
| Normal visible lines | 0.25 mm |
| Secondary details | 0.18 mm |
| Hatch lines, dimensions, text | 0.13 mm – 0.18 mm |
| Construction lines | 0.05 mm – 0.09 mm |
For printing, a common standard plot style (CTB) hierarchy is:
- Thickest: 0.50 mm
- Medium: 0.25 mm
- Thin: 0.13 mm
If you are setting up a new AutoCAD template, a good starting point is:
- Layers: 0.13, 0.18, 0.25, 0.35, 0.50 mm
- Default layer lineweight: 0.25 mm
The exact standard depends on whether you are doing architecture, civil, mechanical, or electrical drawings and whether you follow standards such as ISO, ANSI, or company-specific CAD standards.
Also Read : What is lineweight in AutoCAD?
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