75-Ohm BNC Jack for Video and Test Signal Paths
The 031-71042: It's the 75-ohm member of the 031-71 series, with a 1 GHz frequency ceiling and a bayonet lock that gives a quarter-turn mate, not a threaded one.
What the 75-Ohm Impedance and 1 GHz Ceiling Mean for the Signal
At 75 ohms, the characteristic impedance is matched to the coaxial cable types used in video (RG-59, RG-6) and many test instruments — the connector becomes part of the transmission line, not a lumped discontinuity. The 1 GHz maximum frequency is the usable bandwidth before insertion loss and VSWR degrade; in practice, a 75-ohm BNC with 0.2 dB insertion loss at 1 GHz carries composite video (baseband to ~6 MHz) with negligible attenuation, and the headroom covers higher-rate digital video standards like 3G-SDI (3 GHz) only if the cable and system tolerate a roll-off above 1 GHz — the connector itself is rated to 1 GHz.
Mounting and Termination — Panel Feed-Through with Solder
This jack mounts through a bulkhead panel using the front-side nut and a lockwasher (not included — order separately), with the body's board guide aligning the centre contact to the PCB.
500 Mating Cycles — Field-Service Durability
The bayonet lock (BNC's signature) gives a fast mate and positive retention without tools, and the 500-cycle rating means the locking ramp and detent won't wear loose before the contact does.