TE Connectivity 50 Ohm BNC Connectors - Professional Grade Bulkhead Solder Jack 50 Ohm Professional Grade BNC front mount bulkhead solder jacks with hex nut panel mount retention and a D-shape panel cut-out. These 50 Ohm bulkhead solder sockets have brass bodies and contacts which are available with a variety of platings along with a variety of dielectric materials, please refer to table for details. Stock numbers 394-0664 and 680-7371 are insulated with ABS housiings and stock number 680-7377 also has a solder tag.