Google "1/2 NPT dimensions."
As usual Henry, I didn't phrase the question correctly. What is pitch etc. for a standard pipe thread.
Does this request work better.
Same answer, Don. Google "1/2 NPT dimensions" and you'll find pitch, taper, diameter(s), illustrations, and so forth. I did the Google bit myself to confirm this before posting my first reply. (NPT means "National Pipe Thread," BTW.)