Hey there

For various DIY projects I have in mind I want to design/create my own SCT adapters and etc.
To start with I have very very limited experience in CAD software, but I'm trying to learn...
So far I was able to learn how to do it in Fusion 360, but what I miss are the specs of the thread (at least). All I could find online is that it is 2", 24 TPI which tells me it is 2 inches wide and has 24 threads per inch. Nothing about the internal or external diameter.
I can tinker around the following variables below. These values are mine and nowhere near the real-life sizes. The only correct one I believe is the TPI value. And I guess they should be different for male and female threads.

Can someone knowledgeable shed some light here and help me fill the gaps?