50 Ohm BNC Bulkhead Jack, 4 GHz, Solder Cup Termination
The 031-6290: The 500 V rating and 2500 mating cycles suit it for bench-top and field-service use where the connector sees repeated connect-disconnect duty. The dielectric is polyamide (nylon), and the shield terminates via solder cup — a standard termination for coaxial cable where you tin the braid and flow solder into the cup. The package includes the connector, lockwasher, and nut, so no separate hardware sourcing is needed for the bulkhead mount. The isolated feature designation indicates the connector body is electrically isolated from the panel, preventing ground loops in sensitive RF paths — a detail worth noting when the mounting panel is part of the chassis ground plane.
The lockwasher provides vibration resistance. Solder cup termination for the center contact and shield: strip the coax, tin the center conductor, solder into the cup, then solder the braid to the shield cup.