I am looking for a adapter like this one, but not SMB, one that you directly use to mate a coaxial cable to a circuit board. I have 3 of them, they just say sealectro on them, without a part number. I can't seem to find them on the website. The idea is they do not have any dielectric in them, other then the coaxial base. So you take a piece of coaxial cable, strip it so there is a little bit of center conductor protruding (3mm), then solder it to the adapter, which is already soldered to the board, then you solder the little lid on.
I know it exists because here it is.