50 Ohm SMA Plug for RG-402 Semi-Rigid Cable — Key Specs and Fit
The Hirose HRM-101S(09) is an SMA plug with a male pin, threaded coupling, and a 50 Ohm impedance — the standard for RF interconnects up into the microwave band. It's built for RG-402 (.141" semi-rigid) cable, which means the centre conductor and dielectric dimensions are matched to the 50 Ohm line from the connector through the cable transition. The 18 GHz max frequency is the usable bandwidth; above that the VSWR rises past the typical 1.3:1 limit for this class of SMA. The gold-plated brass centre contact and stainless steel body give this plug the corrosion resistance and mating cycle life (1000 cycles) you need for test equipment, instrumentation, or any interconnect that sees repeated connect-disconnect. This is a complete assembly kit — the package includes the connector body, coupling nut, gasket, and spring washer. No crimp tool needed, just a soldering iron and the correct RG-402 cable prep dimensions from the Hirose HRM series drawing.