This is a single-port bulkhead-mount version secured by a front-side nut, with solder termination on both the centre contact and shield. The 500-cycle mating rating tells you this connector is built for field-service reconnect duty, not just a one-time install.
The bulkhead front-side nut clamps the jack to a chassis cutout — the flange sits outside the panel, so the connector body and cable run are inside the enclosure. Shield termination is solder to the body, which gives a solid ground bond for the 50 Ohm path.
