Threaded mating is used where secure mated condition is desired
(or where connector interface characteristics require a specific
amount of force), and space is available to turn the coupling nut.
The plug coupling nut is engaged with the jack threads and rotated,
either hand-tight, or (for some series) to a specified torque.
For faster mating, some threaded types have double-lead threads.
For severe-vibration applications, most threaded connectors can
be supplied with lockwire holes in the coupling nut.