Standard for Metal Bottle/Cylinder Formed Threads 1

[99ishvr4]

Hello,

I am trying to develop some attachments that will thread onto an existing tool. The attachments are metal cylinders. The existing one that I am examining is shown in the picture below. I am trying to find the thread size of this cylinder so I can model and tolerance it correctly. However, I am having trouble finding a thread standard for threads that are formed in metal. I have found that this is called thread forming or thread rolling, but that is not resulting in much help when searching. Is anyone familiar with the correct nomenclature or standard relevant to these types of threads?

The major diameter is Ø1.81" (46mm), pitch: 8 TPI, 3.5 turns total.

Thank you!

 

[EdStainless]

We had a similar experience; we could find no references.
We molded it in a special non-shrinking silicone compound, and then molded a positive of the part so that we had a reference part.
We then had custom thread cutting tools ground to match.
Ours were SS and we ended up using Al Bronze for the female part to minimize galling risks.
We also found that the vessel was very flexible, sometimes this helped and sometimes it hurt us.

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P.E. Metallurgy, consulting work welcomed