The 5-1814822-5: It is designed for free-hanging (in-line) termination onto CT100 coaxial cable, with a threaded fastening collar and a twist-on shield termination. The 75 Ohm impedance and 1 GHz frequency ceiling suit it for video, CCTV, or broadband RF signal paths where a standard 50 Ohm F-type would introduce a mismatch.
Using a 50 Ohm plug here would create a reflection at the junction, degrading signal quality above a few MHz. The 1 GHz frequency max covers standard-definition video and broadband data, but not modern 3 GHz satellite or DOCSIS 3.1 signals.
Sourcing and lifecycle reality
The 5-1814822-5 is listed as Obsolete. If the design can tolerate a parametric alternative, a standard 75 Ohm F-type plug from another manufacturer (e.g., Amphenol RF, Bomar) with the same CT100 cable group and twist-on shield may fit, but the thread pitch and pin depth should be verified against the mating jack.