Free AutoCAD spring and gear drawing symbols (DWG): ISO 2162 springs, ISO 2203 gears

About the standards

ISO 2162-1 gives the simplified representation of compression, extension, torsion, disc, spiral and leaf springs, in view, section and simplified form; ISO 2162-2 gives the six forms of spring ends. ISO 2203 sets the conventional representation of gears: a gear is drawn as a solid body bounded by the tip surface, with the pitch surface as a thin chain line, and the direction of the teeth is shown by three thin lines.

The blocks are our own drawings after those standards, not copies, and the library is not certified. The figures are schematic: the number of coils, the pitch and the tooth form are not true to the part. Check them against the legend of your project and use the tables on your drawing for the real data.

Frequently asked questions

Which form of a spring should I use?

Use the simplified form on assembly drawings and on drawings where the spring is a bought-in part. Use the view for the detail drawing of the spring, with the data table beside it, and the section where the spring is cut in an assembly. Every spring here has the simplified form; view and section are given for the forms that ISO 2162-1 shows that way.

Do the springs show the real number of coils?

No. The blocks show a few turns so that the type of spring is clear. Write the active coils, free length and wire diameter in the attributes or the data table of your drawing, as ISO 2162-2 asks for compression springs.

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.

Are the gear teeth drawn?

No, and this is intended. ISO 2203 draws a gear without its teeth: a solid body to the tip circle, the pitch circle as a chain line and the root only in sections. The tooth profile is given by a reference to a standard or by a separate drawing, and the direction of the teeth by the tooth direction symbols in this library.

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.