🚀 go-pugleaf

I'd try reading ISO 2593 again.  At least ISO 2593-1984 punts on
threads.  There are three different thread sizes used: 6-32 single
start, 6-32 dual start, and some metric size (M4?).  Heck, differnt
vendors can't even agree which screw is male and which is female!
Then, there are the Swiss using 1 mm pins insated of 1.6 mm pins...

At least every "M34" connector I've seen in the US had 6-32 single
start threads.  I've had to swap male and female screws on a lot of
cables, however.

ISO 2110 calls out no threads.  They admit it to be a local matter.
RS-232 doesn't even specify a connector!

ISO 4902 (37/9 pin) and ISO 4903 (15 pin) call out a M3 thread on the
latching blocks.  (So does RS-449, to my surprise.)  Of course, every
US manufacturer uses 4-40, just like they do on RS-232.  (It may be
that 4-40 and M3 are one of the almost compatible threads betweeen the
two families, but I doubt it.)