$10
Radio-frequency connectors—Part 16:Sectional specification for RF coaxial connectors with inner diameter of outer conductor 7 mm (0.276 in)with screw coupling—Characteristics impedance 50 Ω (75 Ω) (type N)
NEQ IEC 61169-16:2006
全国电子设备用高频电缆及连接器标准化技术委员会(SAC/TC 190)