BKL Electrical SMA Adaptors/Connectors to SMA Connector/Adaptors/Couplers/Socket - BKL 409033, The SMA Adaptor SMA Connector to BNC Coupler 409033 is a standard SMA (Sub-Miniature-A) Male to BNC Female coupler used mainly for applications in the frequency ranges 1GHz to 18/26.5 GHz (depending upon the design). The plug connector is considered as male and the socket as female, depending upon the design of the inner conductor as metallic pin or as metallic pipe. It has a high mechanical strength owing to the screw lock (8mm). BKL 409033 SMA Adaptor Connector to BNC Coupler