Free ASME B16.9 butt-weld fittings for AutoCAD (DWG): elbows, tees, caps and reducers

About ASME B16.9 and the dimensions

The pipe outside diameter and the lengths follow the tables of ASME B16.9. The long radius elbow has a bend radius of 1.5 NPS and the short radius elbow of 1 NPS; the 45 degree elbow is drawn on the long radius, so its end distance is calculated and can differ from the table by 0.5 mm. Elbows, tees and caps agree in three published tables.

The blocks are our own drawings, not copies of the standard, and the library is not certified. Dimensions are nominal, without tolerances. The lengths of 59 of the 78 reducer size pairs agree in two published tables and the rest come from one. Caps of the thicker walls have a longer length that is not drawn. Check the dimensions against the edition of ASME B16.9 your project uses.

Frequently asked questions

Are these fittings to ASME B16.9?

Yes. The pipe outside diameter and the centre-to-end and end-to-end lengths come from the tables of the standard. They are nominal drawing dimensions, without tolerances and without the wall thickness.

Which wall thickness do the fittings have?

None is drawn, so every block fits any schedule. Enter the wall thickness or schedule in the SCHEDULE attribute, which is empty by default.

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 get a fittings list from my drawings?

Export the fitting blocks of all drawings to Excel with BlockSync: one row per block with DESIGNATION, material, schedule and quantity. Total them with a pivot table to get a fittings list.

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.