If it was “fatter” the “fatness” would have been on the inside. No matter the wall thickness the OD is the same, until it gets to 14” or bigger.
ETA: Nominal pipe size is ID until 14” then it’s OD.
I’ve used lead wool or angel hair solder and even cotton twine in the “valley” of the threads in addition to pipe dope on systems that positively could not leak.
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