The SMA adapter was designed as an OSM connector by Bendix and Omni-Spectra in the late 1950s and was one of the most commonly used RF/microwave connectors at that time.
Initially, SMA adapters were designed for 0.141" semi-rigid coaxial cables and precision connectors for microwave applications in the military industry. They were filled with PTFE dielectric. Under the conditions at the time, due to the small size of SMA connectors, It can work at a higher frequency (the frequency range for connecting semi-rigid cables is DC～18GHz; when connecting soft cables, it is DC～12.4GHz), and it has quickly become popular.
The current size of SMA adapters includes ferrule diameter, ferrule length and nut specifications. The standard sizes are 3.172mm, 9.8mm and 1/4-36 threads.
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