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CAD symbol libraries

CAD symbols for industrial drawings

Welding, electrical schematic, hydraulic, pneumatic and P&ID symbols drawn after the ISO and IEC conventions, and industrial equipment from valves to cranes drawn in plan and elevation. Every symbol and every size is its own block in the DWG and DXF, and each symbol library has a PDF sheet to print.

Open the libraries How the files are built →
Welding Symbols library1:1 · mm

  • One block per symbol

    Open the file and every symbol is already a block with a readable name, so you insert a check valve or a fillet weld by name instead of copying it from a sample drawing.

  • Drawn to the convention

    The shapes follow the published conventions for each discipline: ISO 2553 for welding, IEC 60617 for schematics, ISO 1219 for fluid power and ISO 10628 with ISA-5.1 bubbles for P&ID.

  • DWG, DXF and a PDF sheet

    The DWG is saved for AutoCAD 2010 and later, the DXF opens in almost any CAD program, and the PDF lists every symbol with its name for quick reference on paper.

CAD symbol libraries by discipline

Welding, electrical schematics, hydraulics, pneumatics and P&ID, each one a set of named blocks you insert by name.

Industrial equipment CAD blocks by category

Valves, pumps, tanks, motors, conveyors, racking and cranes, each drawn in plan and elevation in millimetres, in DWG and DXF.

All CAD symbol libraries and equipment blocks

431 blocks on 62 pages, in DWG and DXF, with a printable PDF sheet for every symbol library.

  • 431 symbols as blocks
  • 23 symbol libraries
  • 11 languages
  • 0 accounts needed

CAD symbols as blocks, not a picture of a chart

Most symbol references online are a table in an image or a PDF. They help you read a drawing, but you still have to redraw every symbol before you can use it. Here the chart and the file are the same thing: what you see on the page is rendered from the DXF you download.

The symbols are drawn at paper size on a 2.5 mm grid, so they sit at a consistent size in a schematic or on a sheet. Scale them on insert if your drawing uses another plot scale.

How to insert CAD symbols in AutoCAD

The same steps work in BricsCAD, ZWCAD and other programs that read DWG.

  1. Download the DWG

    Save the library file somewhere you keep your drawing standards, so every project can reach it.

  2. Open DesignCenter

    Type ADCENTER, browse to the library and open its Blocks entry. Every symbol appears with its name and a thumbnail.

  3. Drag the symbol you need

    Drag it into your drawing or double-click it to insert. The block keeps its name and layer, so it stays easy to select and count.

How the files are built

CAD symbols: common questions

  • Are the symbols free for commercial work?

    Yes. You can use them in drawings you deliver to clients. What the license does not allow is publishing the files as a library on another site.

  • Do the symbols comply with the standard?

    They are drawn following the published conventions of each standard, but we are not ISO, IEC or ISA and the files are not an official edition. If a contract names a standard, check the symbols against its current edition.

  • Why is there a PDF if I have the DWG?

    The PDF is a sheet with every symbol and its name, meant to print, share with someone who has no CAD program or keep open next to the drawing.

  • Which CAD programs open the files?

    The DWG opens in AutoCAD and AutoCAD LT 2010 or later, BricsCAD, ZWCAD and DraftSight. The DXF opens in most CAD programs, including LibreCAD, QCAD and FreeCAD.