In message , Jeff writes

However, note that you can't inter-mate 50 and 75 ohm N-connectors,
as the 75 ohm has a much* thinner pin.
A 50 ohm female in a 75 ohm male won't make contact (unless you put
a bit of wire inside the female receptacle). A 50 ohm male fully
mated with a 75 ohm female will splay the receptacle, and cause
usually permanent damage.

The 50 & 75 ohm BNCs that I have in front of me at the moment have
identical pin dimensions.

Also the spec sheets on Amphenol's website show the pins as being the
same dimension.

Are there any drawings? If so, do they show the 50 ohm pin being
somewhat 'bull-nosed', while the 75 is more pointed - and the
differences in the PTFE dielectric 'sleeve'?


--
Ian