The series TNC connectors are popular thread coupling middle-power coaxial connector, it have characteristics of reliable connect and vibration-proof,for the connect RF coaxial-cables in electronic equipment and instruments, and can be inter-changeable with the same-type connectors of abroad. The interface dimensions and technical characteristics are in accord with the specifications of MIT-C-39012, IEC169-17 and CECC22200. Characteristic impedance 50 Ohm, 75 Ohm. 50 Ohm and 75 Ohm versions can be interconnected without restriction.