Free AutoCAD hydraulic and pneumatic symbols (DWG) after ISO 1219: valves, cylinders, pumps, filters

About ISO 1219

ISO 1219-1 defines the graphic symbols for fluid power systems and components, and part 2 the circuit diagrams and component designations. The symbols are drawn with a module M, so that every symbol has the same proportions, and hydraulic and pneumatic details follow the conventions of the standard.

The blocks are our own drawings built with this module system, not copies of the figures of the standard, and the library is not certified. Check a symbol against the edition of ISO 1219-1 that your project or customer uses, and change the block if yours differs.

Frequently asked questions

Are these symbols to ISO 1219?

They follow the conventions of ISO 1219-1: the module system, the flow path arrows and T marks, the actuator symbols and the supply-line insertion point. They are our own drawings and the library is not certified, so check them against the edition you use.

Does the library cover both hydraulic and pneumatic circuits?

Yes. The valves, cylinders, filters and instruments are shared; pumps, motors, pilots and exhausts are drawn in the hydraulic form (solid triangles) and the pneumatic form (open triangles, exhaust to atmosphere).

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

How do I make a parts list from my circuit diagrams?

Export the blocks of all circuit diagrams to Excel with BlockSync: one row per block with its tag and attributes. Fill in the part numbers there and write them back in one run, with preview and backup.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.