Download Free AutoCAD Linetypes (34+ Utility & Civil LIN Files)

This page provides a field-ready library of AutoCAD linetypes (.LIN) used in utilities, civil engineering, architecture, and MEP drawings.

These are not decorative patterns. These are production linetypes used for site plans, infrastructure drawings, and coordinated construction documents.

Each entry below includes a clear use case, so you can apply it directly in real projects. Here’s how to install linetypes in AutoCAD.

How to Install Linetypes in AutoCAD

Type LINETYPE or LT
Click Load
Select your .LIN file
Assign the linetype to objects or layers

If nothing changes visually:

Adjust LTSCALE (global scale)
Adjust CELTSCALE (object scale)
Set PSLTSCALE = 1 for layouts
Run REGEN

Typical starting point:

LTSCALE = 1 (then adjust depending on drawing scale)

Important Notes Before Using Custom Linetypes

Text-based linetypes depend on your Text Style
If you use a custom font (e.g., Arial), text inside the linetype may shift or misalign
For stable results, use Standard style with TXT.SHX
Complex linetypes require .SHX shape files
If missing, the linetype may fail or display as continuous

Critical: If you see “Expression expected” or “Bad definition” errors, it is almost always a missing .SHX file

Behavior differs between Model Space and Layouts

Reference: AutoCAD documentation https://help.autodesk.com/view/ACD/

Units and Scale (Metric vs Imperial)

acad.lin → optimized for imperial (inches)
acadiso.lin → optimized for metric (millimeters)

If your linetype looks wrong:

You are likely using the wrong base file
Or your LTSCALE does not match your units

Utility Linetypes (MEP & Infrastructure)

Gas_Line.lin A standard utility line with the letter “G” spaced at regular intervals for natural gas pipes.
Gas_High_Pressure.lin Labeled with “GHP” to distinguish high-pressure gas mains from domestic lines.
Water_Domestic.lin Features a “W” for domestic cold water supply lines in site plans.
Hot_Water.lin Linetype with “HW” for plumbing and heating layouts.
Sewer_Sanitary.lin Broken by “S” or “SS” for sanitary sewer mains.
Storm_Drain.lin Uses “SD” or “ST” to identify storm drainage systems.
Fire_Water.lin Labeled with “FW” for fire protection systems.
Reclaimed_Water.lin Uses “RW” for non-potable water (commonly purple-coded systems).
Irrigation_Line.lin Features “IRR” for landscape irrigation systems.
Fuel_Oil_Line.lin Marked with “FO” or “OIL” for industrial fuel systems (do not confuse with Fiber Optic).
Compressed_Air.lin Labeled with “CA” for pneumatic systems.
Vacuum_Line.lin Uses “VAC” for industrial or medical vacuum piping.
Steam_Line.lin Labeled “ST” for high-temperature steam distribution.
Oxygen_Line.lin Uses “O2” for hospital gas systems.

Electrical & Telecom Linetypes

Electric_Overhead.lin Displays “E” for overhead power lines.
Electric_Underground.lin Uses “UE” or dashed “E” for buried conduits.
Telephone_Line.lin Marked with “T” for telecom routing.
Fiber_Optic.lin Uses “FO” for fiber data lines.
Overhead_Telecom.lin Uses “TEL” or “COMM” to distinguish from electrical networks.

Civil Engineering & Survey Linetypes

Property_Line.lin Dash-dot-dot pattern for legal boundaries.
Easement_Line.lin Labeled “ES” for access or utility easements.
Limit_of_Construction.lin Uses “LOC” to define construction limits.
Boundary_Survey.lin Includes monument symbols (squares or circles) for survey control points.
Railway_Tracks.lin Ladder-style ticks for rail infrastructure.
Guardrail.lin Graphical representation for roadway guardrails.
Tree_Line.lin Scalloped line for vegetation boundaries.
Road_Centerline.lin Standard DOT-style centerline for road design.
Silt_Fence.lin Marked “SF” for erosion control.
Straw_Wattle.lin Uses “SW” for sediment barriers and erosion control systems.

Architecture & Construction Linetypes

Batt_Insulation.lin S-curve pattern representing fiberglass insulation.
ZigZag_Break.lin Standard break line for long elements.
Demolition_Line.lin Dashed pattern indicating elements to be removed.
Chain_Link_Fence.lin Repeating “x” symbols for fencing.
Barbed_Wire.lin Double spike pattern for security fencing.

Mechanical & Industrial Linetypes

Double_Line_Pipe.lin Simulates a pipe using parallel lines (visual only, does not create geometry).
Flow_Arrow.lin Embeds arrows to indicate flow direction.
Drainage_Perforated.lin Used for perforated pipes in drainage systems.
Cable_Tray.lin Represents cable trays in industrial layouts.

Annotation & Symbol Linetypes

Dashed_Space.lin Custom dash-gap ratios not found in standard AutoCAD.
Dot_Leader.lin Fine dotted line for annotations and references.
Center_Long.lin Extended centerline pattern for large-scale drawings.
Hidden_Tight.lin Fine hidden line for detailed mechanical work.
Centerline_Text.lin Centerline with embedded text such as “CL”.
Phantom_Long.lin Extended phantom line for large assemblies.

Download Linetype Pack (LIN + SHX)

Some linetypes—especially insulation, fences, and survey symbols—require .SHX files.

Always download:

.LIN file
.SHX shape files

If not:

Linetype may not load
Or will display incorrectly

Common Issues and Fixes

Linetype not visible

Increase LTSCALE
Run REGEN

Text not aligned

Use Standard text style (TXT.SHX)

Looks continuous

Scale too small
Missing SHX file

Different in layout

Set PSLTSCALE = 1

Workflow Tip

Use these linetypes with:

Layer standards
AutoLISP automation
Template files (.DWT)

This avoids manual cleanup and keeps drawings consistent across teams.

FAQ – AutoCAD Linetypes

How do I load a LIN file?

Use LINETYPE → Load → select file

Why do I get “Bad definition” error?

Missing .SHX file in almost all cases

Why is my linetype not showing?

Check:

LTSCALE
PSLTSCALE
Drawing units

Why is text shifted inside the linetype?

You are not using TXT.SHX or Standard style

Can LIN files create geometry?

No. They only control appearance, not actual geometry.

Disclaimer

Always test custom linetypes on a copy of your drawing. Display depends on units, scale, fonts, and project standards.