Bayonet Neill Concelman (or British Naval Connector) (or Bayonet Nut Connector)

(B-N-C)

A coaxial cable connector that, in its male form, has a center pin connected to the center conductor and a metal tube connected to the cable shield. A rotating ring surrounding the tube and containing small holes mate with projections on the female connector to make the connection (see picture).

The female BNC connectors are typically called T-connectors because the projections make the connector look like the letter "T" when looked at sideways. Two T-connectors back to back is called a barrel connector and is used to connect two cables together.

Note: The latter two expansions above are sometimes used but are not correct. The connectors were named after their creators; Neill designed the "N-type" connector and Concelman designed the "C-type" connector. The BNC is a hybrid "N/C-type" with a mechanical extra; the bayonets.

A threaded version is available for connectors with high mechanical loads: TNC or Threaded Neill Concelman connector.

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