I picked up a couple of new Tohtsu CX-600M coaxial relays - they are similar
to the DowKey relays, with three UHF connectors of the SO-239 design. I had
a problem screwing on the PL-259s more than 3-4 turns and in checking the
threads I find that the pitch or threads-per-inch of the Tohtsu connectors
does not match that of the PL-259/SO-239 UHF connectors. I wonder if anyone
else has run into this problem? I was under the impression that the UHF
connector was a universal item, but maybe that is not true?

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73, Floyd - K8AC