903-420J-52P - 

The SMB interface features a snap-on coupling mechanism and is available in 50 Ohm and 75 Ohm configurations. SMB connectors conform to the requirements of MIL-C-39012, and the interface is in compliance with MIL-STD-348. SMB connectors offer broadband performance with low reflection DC to 4 GHz and utilize die cast components on non-critical areas to provide a low-cost solution.
Features and Benefits:

Selective Plating Provides Corrosion Resistance Finish As Well As Good Solder-Ability Characteristics

Various Plating Options in Nickel, Gold, and Tin lead

SMB PCB Slide-On Plug and Jack Allows Board-to-Board Mounting with a Low Insertion Force Making this is ideal for Mating a High Number of Connectors on a Pair of PCB?s