67Dart273 said

The "usual thing" back in the days of aircraft / military used to be "Cannon connectors" They and Amphenol.......

http://www.newark.com/itt-cannon/ms3126f20-41sy/circular-connector-plug-size-20/dp/92B5307

http://i28.photobucket.com/albums/c219/zinedine05/canon2.jpg

Click to expand...