SMB
Sub miniature snap-on connector, operating in the range DC-4 GHz 50 ohms / part series R114 (AEP 2000-2699)
Also available: Limited Detent version with low mating force suitable for use with PCBs (part series R115), Slide-on version (also named SUBGLIS) suitable for back-plane and blind mate applications (part series R116) and Lock version (part series R117).
SMB was developped in the 1960s and is standardized according to IEC 60169-10.