threads standards

Hello, Slow to the game here once more (even though I mentioned something a while back in another post)... Okay. So, if the 0.394" hole needs to be threaded internally, how would I go about this idea? It should not be beyond me so far but it is beyond me. Should I measure from the center...

Thread Standards: The most frequently used thread form is the 60° thread form found in the metric ISO thread and in the UN-series. However, there are other thread standards as well. These are either based on foreign standards or are used for special applications. E.G. in the...