The TE Connectivity 1-1478409-0 is a BNC jack, female socket from the Greenpar series — a 50 Ohm bayonet-lock connector built for RG-58C, 188A, 316, and URM95 cables. The silver-plated brass body and centre contact, PTFE dielectric, and clamp-style shield termination give it a straightforward field-termination workflow with a solder cup on the centre pin.
The 4 GHz bandwidth at 50 Ohm nominal impedance defines the usable frequency range — stay under that ceiling and the connector holds a clean signal path with no impedance bump at the junction. The cable-group list (RG-58C, 188A, 316, URM95) tells you the dielectric diameter and braid geometry the clamp and centre contact are sized for; use one of those cables and the termination dimensions line up without guesswork. Silver plating on the centre contact and body keeps insertion loss low across the band, though it tarnishes faster than gold in corrosive environments — indoors or controlled-atmosphere gear is the natural home.