An interface drive coupler for a replaceable unit of an electrophotographic image forming device according to one example embodiment includes a first component and a second component coaxial with the first component along a rotational axis of the interface drive coupler. A force receiving portion is positioned on the first component and a force transmitting portion is positioned on the second component. Angled grooves on one of the first and second components matably receive angled ribs on the other of the first and second components to prevent the first and second components from separating from each other.