Bob Bob wrote:
Without actually researching it I suspect the power handling capacity
will be similar to the 1/2" line itself. When a N plug mates with a N
socket it presents the same Z as the line with pretty well the same
diameters. ie the small pin is not carrying the whole load.

The little pin is only a mating guide for a much larger center conductor.

I like 7/8" "Heliax". EIA connectors.