IEC 60169-8-1978
射频连接器 第8部分:外导体内径为6.5mm(0.256 in)的卡口锁紧射频同轴连接器 特性阻抗50Ω(BNC型)
Radio-frequency connectors. Part 8 : R.F. coaxial connectors with inner diameter of outer conductor 6.5 mm (0.256 in) with bayonet lock - Characteristic impedance 50 ohms (Type BNC)