IEC 60169-11:1977
Radio-frequency connectors - Part 11: R.F. coaxial connectors with inner diameter of outer conductor 9.5 mm (0.374 in) with screw coupling - Characteristic impedance 50 ohms (Type 4.1/9.5)
This standard concerns r.f. coaxial connectors for use with r.f. cables, both flexible and semi-rigid, with air dielectric interface and high mechanical stability to withstand severe environmental exposure. The connectors provide low reflection in the microwave region up to 14 GHz and they are watertight and air-tight against a pressure difference of 3 bar.