An analog video camera has this connector.
9.4mm, sting hole much thinner than in RCA (but still too thick for a copper core); has 2 bumps (or whatever they're called) on its sides (turning lock?). No screw thread.
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
It's a BNC female connector. It may be 50 ohms or 75 ohms (50 ohms is more common for antennas and 75 for video).
The difference is not too important for the connector itself, but you should find out the proper impedance for the cable or you may compromise the video quality.