For refrigeration, a 1/4" male flare fitting is used, with the same internal thread as above.

There are also collapsible die heads that are used to cut an internal thread.

Four worm geared shafts are driven which intersect with internal threads built into the troughs.

It was a sham election, all opposition being prevented to participate by internal and Italian threads.

The process can be done to create external or internal threads (male or female).

A threaded standoff is essentially a hollow metal tube with internal threads.

Every matched pair of threads, external and internal, can be described as male and female.