In the dawning of the IBM PC era, the computer case was a heavy, stout thing. These were industrial machines, built with beefy paddle power switches, and weighing as much as a ton of bricks.

There are male and female versions that mount from the rear, and a female version that mounts from the front (see image). Threads are all M8 x 1mm and O-rings seal to the panel is a way that meets ...