On 19/08/2017 09:32, Ian Jackson wrote:

This is NOT totally correct. While the profile of the pins are slightly
different (the 50 ohm usually has a somewhat stubbier point), the
diameters are the same. The difference in characteristic impedance is
achieved by the amount of PTFE dielectric.

An interesting snippet, Ian, thanks.

Perhaps time to remind all that BNC is Bayonet-Neill-Concelman
and not Bayonet Navy Connector, as M3s and M6s past and present and
other similar CBers maintain.