The 1053635-1: It's a same-series (OSM to OSM) conversion adapter, meaning it doesn't change connector type; it just extends or re-routes the signal through a threaded, free-hanging in-line body. The stainless steel shell and gold-plated beryllium copper centre contacts are built for field-service duty where the adapter gets connected and disconnected repeatedly — 500 mating cycles before the contact resistance drifts.
What the 50 Ohm and 18 GHz Ratings Mean for Your Signal Path
The 18 GHz max frequency means it's usable through the full Ku-band and into the lower Ka-band; above that the VSWR climbs and the adapter starts reflecting power back toward the source. A brass contact would take a set after a few hundred cycles; this one won't.