About Indutorial

What Indutorial is: CAD symbol libraries for industry

Indutorial is a free collection of CAD symbol libraries and equipment blocks for industrial drawings: welding, electrical schematics, hydraulics, pneumatics and piping and instrumentation diagrams. Each library downloads directly in DWG, DXF and PDF, with no account. The site is paid for by advertising.

How the CAD symbol files are built

Nothing here is traced from a scan. Every symbol is written as code that draws its lines and arcs on a 2.5 mm grid, at the size it should have on paper, and is saved as a named block. One script then builds the library DXF, renders the previews you see on each page from that same DXF, converts it to DWG 2010 and converts the DWG back to DXF to check that every block came through with the same entities and layers. The PDF sheet is printed from those previews.

Which standards the symbols follow

Each library names its convention on its page: ISO 2553 for welding, IEC 60617 for electrical schematics, ISO 1219-1 for hydraulic and pneumatic circuits, and ISO 10628-2 for P&ID equipment, with instrument bubbles after ISA-5.1. The standards themselves are sold by their publishers and are not reproduced here. The symbols are our own drawings of those conventions, and the descriptions are written by us.

A symbol drawn wrong: how to tell us

If a symbol is drawn wrong, a file does not open or a name is misleading, write to [email protected]. The contact page lists what to include so it can be fixed quickly.

No affiliation with standards bodies or Autodesk

Indutorial is an independent project. It is not affiliated with ISO, IEC, ISA or AWS, or with Autodesk, Inc. AutoCAD and DWG are trademarks of Autodesk, used here only to describe file compatibility.