The SF-SF50+ is a 50 Ohm SMA female to SMA female coaxial adapter from Mini-Circuits. It operates from DC to 18 GHz with low insertion loss and panel mount bulkhead design.
Radiall R125720000W is an SMA to SMA jack to jack adapter with 50 Ohm impedance and 18 GHz frequency range. It features a straight bulkhead panel mount design with gold plated center contacts.
Radiall R125720000 is an SMA female to female straight bulkhead adapter with 50 Ω impedance, operating from DC to 18 GHz. It features a gold-plated stainless steel body and beryllium copper center contacts.