It is a single-port, isolated, bulkhead-mount connector with a right-angle through-hole PCB tail and a bayonet lock. The 75 Ohm impedance and 18 GHz frequency ceiling place it in the HD-BNC class — the higher-density version of the standard BNC that handles 4K and 12G-SDI signal paths without the impedance mismatch a standard 50 Ohm BNC would introduce on a 75 Ohm line.
75 Ohm, 18 GHz — the signal-path spec that decides the fit
A standard 50 Ohm BNC will physically mate, but the impedance step at the junction creates a reflection that kills signal integrity above a few hundred megahertz. The 18 GHz max frequency tells you this jack is rated for the full 12G-SDI data rate (12 Gbps) and beyond — the PTFE dielectric and beryllium copper center contact keep the transmission line clean through that band.
Mounting and termination — bulkhead feed-through with a right-angle PCB tail
The 034-1140-12G mounts through a panel bulkhead with a front-side nut and terminates to the PCB via a right-angle through-hole solder tail. The gold and nickel body finish resists corrosion in the panel opening.
The bayonet lock gives a positive tactile lock without the thread wear of a screw-on connector.
The closest functional peer in the HD-BNC series is the 034-1131-12G — a 2-port version of the same 75 Ohm, 18 GHz, isolated, bulkhead-mount jack. The 034-1140-12G is the single-port variant. If your BOM calls for two independent signal paths through one panel opening, the 034-1131-12G saves a second cutout. Against a standard 75 Ohm BNC like the 031-70578-12G (12 GHz max), the HD-BNC's 18 GHz ceiling gives headroom for 12G-SDI and emerging UHD standards that a standard BNC cannot guarantee.