BNC Bulkhead Jack with Extended Insulation — What It Is
The 4 GHz upper frequency covers L-band and S-band applications; above that, the BNC interface geometry starts to degrade VSWR. For a bulkhead feed-through, the nickel body finish gives adequate RF shielding and corrosion resistance in indoor racks or lab benches, though for outdoor or salt-fog environments you would typically spec a stainless or tri-metal finish.
Solder cup termination on the centre contact — strip the coax centre conductor, tin, and solder into the cup.