How far in does a pipe fitting thread?

When drawing up homemade pneumatic Nerf guns in a CAD program, I used to wonder how deep a fitting would go in. Eventually I learned that technical drawings from McMaster-Carr and many other places offer this information in the listed “thread engagement”. See the drawing from McMaster-Carr below.

Click on the image to view the full sized version.

This information has finally allowed me to start making accurate drawings of my Nerf guns. See the little icon on the top left for an example. (I admit I was a little lazy and I didn’t cover up the threads in the overlap. This actually is somewhat useful, though, so it’s not a problem.)

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