BNC Jack, 50 Ohm, 4 GHz — Greenpar Series
It uses a bayonet lock for quick mate and disconnect — the standard BNC coupling that locks with a quarter turn. The body is brass with a nickel finish, and the center contact is brass with gold plating, good for 500 mating cycles.
No direct replacement is listed on record. If you are designing a new BOM, look at current-production BNC jacks from the Greenpar or similar 50 Ohm families; the bayonet lock and 4 GHz ceiling are common in the class.
The bayonet lock gives a vibration-resistant mate without threads, so it suits panel-mount applications where quick disconnect matters. Gold on the center contact supports the 500-cycle rating; the nickel body finish resists corrosion in indoor or sheltered environments. Through-hole solder termination means the center pin and shield legs go through the PCB and are hand-soldered or wave-soldered — no press-fit tooling needed.