The NMD (formally called Network Measurements Division) connectors are available in 3.5 mm, 2.9 mm, 2.4 mm, and 1.85 mm sizes. Each large, threaded body is designed to stabilize the test port cable when attached to the front of the analyzer or test set.
These connectors with the NMD design are test port male connectors with standard inside threads that can accommodate female connectors. It is important to use the recommended cables with NMD connectors.
For more information on the MegaPhase NMD connectors, download the datasheet.