The 112405-12: This is the 75 Ohm variant of the BNC — not the more common 50 Ohm version — which means it's designed for video, broadcast, and telecommunications signal paths where 75 Ohm transmission lines are standard.
Frequency Range and Signal Path
Rated to 4 GHz maximum frequency, this jack covers the full L-band and most S-band applications. The gold-plated phosphor bronze centre contact and PTFE dielectric maintain a consistent impedance through the launch, so the transition from coax to PCB trace stays clean up to the 4 GHz ceiling. 500 mating cycles means it handles field-service reconnect duty without the centre contact fretting.