A terminal device used in grounding direct current electrical components, such as audio amplifiers, having a metal contact plate provided with a first opening sized to receive a securing screw and having a second opening sized to receive a locking screw used to attach the terminal device to a metal member of another structure, wherein the first opening is positioned relative to the second opening so that with the securing screw attaching the metal contact plate to a grounding surface, the head of the locking screw will contact and apply anti-rotational forces against the head of the securing screw when the locking screw is also screwed into the grounding surface.