Not wishing to cause further confusion on this point, but on doing a search I find there are three conflicting thoughts, UNC, Whit and ISO. however a search on google did bring up the various specs for each thread i.e thread angle, pitch and threads per inch, but nothing conclusive.
So let us assume it's a Whit/UNC thread as the difference is not major and both appear to mate together, although not in perfect harmony.
Harry
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