Abbreviation for Threaded Navy Connector. The TNC is a common connector for coaxial cable, particularly in demanding applications. Essentially it can be thought of as a threaded version of a BNC, but because it is threaded most people believe it is capable of a more robust and secure connection than the twist on coupling of BNC connectors. The higher the frequency passing through the connector, the more critical the connection. Many wireless systems utilize TNC connectors for their antenna inputs.