The 6274359-1: It's the impedance-matched variant for video distribution, broadcast equipment, and precision data acquisition where the 50 Ohm standard would create a reflection at the interface. The 75 Ohm impedance pairs directly with RG-59 and RG-6 cabling — the common video and CCTV coax — without a matching pad. Rated to 4 GHz, it covers composite video, SDI, and HD-SDI signal paths comfortably.
The 75 Ohm characteristic impedance is the video and broadcast standard. The 4 GHz bandwidth holds the impedance constant through the launch.
Mating, Termination, and the Bayonet Lock
This jack mates with any standard 75 Ohm BNC plug — the bayonet lock is the same mechanical interface regardless of impedance. The zinc body with tin finish gives a solderable ground connection, but the tin is soft — don't over-torque the bayonet nut against the body threads or the plating can gall. The silver housing colour is the bare zinc under the tin flash; it's not a cosmetic defect. For field replacement, the centre contact is integral to the body — you replace the whole jack, not just the pin. Keep a few on the shelf if this is a common repair item.