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September 20, 2021 at 11:24 pm
#246983
I’m sure that it is a #16 – 20 . Major diameter of #16 is 0.268″ and came in 16, 18 and 20 TPI. Typically the thread will mic a few thousands smaller than the nominal size. I neglected to put the size for #16 in the previous post, I’m going back and edit now.
Joe B