BNC Jack, 50 Ohm, Panel Mount — TE 5226993-1
It mounts through a bulkhead with a front-side nut and terminates via solder cups to the centre pin and shield.
The 4 GHz ceiling is typical for a commercial BNC; above that, the interface geometry starts to mode, and you'd step up to an SMA or N-type. The 500 mating cycles are a solid figure for a panel jack that gets reconnected a few times a week over years — tin-plated centre contacts will show wear sooner than gold, but at this cycle count it's acceptable for most lab or production-floor duty. The panel mount with a front-side nut means the jack is secured from the outside of the chassis, and the solder termination requires hand or wave soldering to the PCB traces — no press-fit here.
Mounts through a bulkhead with a front-side nut — the threaded barrel passes through the panel from the inside, and the nut tightens from the front. The shield termination is solder (the outer braid of the coax solders to the cup on the body), and the centre contact also terminates via solder. The housing colour is natural silver from the nickel plating.