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What thread is the external thread on a NMD connector?

Question asked by drkirkby on Sep 19, 2012

I have an 8720D VNA with NMD thread damaged on one of the test ports, which it may be possible to clean up. There is a picture of the damage here

What exactly needs replacing on this 8720D VNA - is the parts available 

However, I'd like to know what thread this is, so I could get a nut to check the thread is clear before putting the expensive test port cables on it. 

I'm guessing this is some American thread, rather than a metric one, but does anyone know what the thread is?