Used to transmit a signal from internal circuitry through a panel, using a single mounting hole. Best suited for use with thick panels. Connector mounting surface and mounting hole are usually "D" shaped to prevent rotation.

Straight jack types are available as front mount (mounting nut behind panel) or rear mount (mounting nut in front of panel).

Right angle types are used in applications requiring a low profile, or to avoid bending cable.

Isolated ground types: A secondary coaxial dielectric insulates the connector body from the panel. A solder lug is provided to transmit the ground signal from the connector body.