Glass Bottle Thread

Does anyone know what kind of threads are on the top of a glass bottle?  Twist off beer botte, jars, etc?

Trying to figure out how to 3d print female threads to attach to them securely.  

I don't know the thread type but could you make a mold with clay or something and fill it with wax?

Have you tried the googles? I just looked for mason jar threads and found a few 3D print models. Bottle caps, too

Are they generic or brand specific?  Enquiring minds want to know.

matthewmcl said:

Have you tried the googles? I just looked for mason jar threads and found a few 3D print models. Bottle caps, too

yes I've googled the E36 M3 out of this.  

Did you find parametric 3D models?  Or just .stl files?

I want something I can work with, hence my desire to understand the thread.  I can find something like this for common threads:

I can also use a built in thread function in most cad softwares to model standard threads easily... but nothing about glass jars.

Actually I found this:  https://web.archive.org/web/20160101092059if_/http://www.gpi.org/sites/default/files/drawings/4614.pdf

But thats just one.  I'm looking for a comprehensive resource.  It seems GPI.org drawings are behind a paywall?

Gotta love it when you can't get specification documents w/o paying.  Old government specs (MIL, AN, etc) are about the only ones you can reliably expect to find for free.

Looks like searching for various combinations of the words "GPI neck finish specification drawing" gets some results.  Variations on "glass bottle technical drawing" also has a bunch of stuff.

This site has a list of the GPI drawing numbers and a few (almost legible) images: https://www.chinaglasscontainer.com/a/news/2022/0520/18.html

Unless you want one of the European standards, b/c everybody has to have their own?  There's a European packaging organization which might give free access to their standards (if you register): https://www.cetie.org/en/

Random thought: if you want a no-slop fit with an uncontrolled/ untested bunch of different containers, maybe intentionally design your thread profile for a slight interference fit (and your product with clearances or ability to deform and compensate).  Sort of like the not-completely-round all metal locknuts, or the way BSPP+BSPT fittings are supposed to seal, or the segmented threads on plastic bottles, or the o-rings with an X-shaped cross section. 

In reply to ProDarwin :

I just found .stl. can you import those to wrap around and check? Not comprehensive, I know.