RS PRO Circular Connector, 2 Contacts, Cable Mount, Miniature Connector, Socket, Female, IP68

From RS Pro, these threaded sockets are serious contenders for your application. This particular model has a bigger and stronger shell complimented by its cable to cable (inline) connection. That coupled with the IP68 rating, makes sure that this industrial connector excels in harsh environments. Typical applications include outdoor security, medical devices, communications and marine equipment. When choosing a female connector, this version should really be one you consider.

Threaded Coupling