The 031-70543-12G: It is the female end of a 75 Ohm BNC interconnect — used where the system impedance is 75 Ohm rather than the more common 50 Ohm, typically in video distribution, CCTV, broadcast, and broadband data networks. The jack accepts the cable shield via a crimp ferrule and the center conductor via a crimp contact, both supplied in the same package. The bayonet lock provides a quarter-turn mate with positive retention, rated for 500 mating cycles. Operating temperature range is -30°C to 85°C, covering unheated equipment rooms and outdoor enclosures.
Cable Group and Crimp Setup — Belden 4505R
This jack is tooled for Belden 4505R, a 75 Ohm coaxial cable. The dielectric material is PTFE.
The gold center contact (phosphor bronze base) resists fretting corrosion over repeated mates. The bayonet lock does not rely on threads, so there is no galling risk. After 500 cycles the contact resistance may rise above the initial 3 mOhm typical, but the connector remains functional for permanent or semi-permanent installations well beyond that count. The nickel body finish does not flake or peel under normal handling.