SNIP
As a side note, I know that we have several Ham Radio operators on the board and the antenna connectors for co-axial cable are UNEF threaded. I have however ran into some PL 259 connectors that were made with metric threads. They looked the same as 5/8-20 threads but would not thread onto the SO-239 socket.
Hi there, 75Plus,
I've just done a search for 'Amphenol SO239' and the best data sheet I found quotes 5/8" by 24 tpi UNEF.
I wrote 'just' but it was actually an hour ago - I was called to dinner and left this reply un-posted!
In my Amateur Radio days, I often encountered pseudo PL259s and SO 239s of Far Eastern origin. Their threads were 5/8" by 1 mm pitch, their bodies were die-cast from zinc alloy and plated. I think the insulators were recycled washing-up bowls!
Sometimes they would cross-mate with 'proper' PL259s and SO 239s and sometimes they wouldn't!
Fortunately, from dismantling many items from the war surplus market, I had built up a good stock of genuine Amphenol UHF connectors, real brass, silver-plated all over and with insulators of mica-loaded Bakelite.