An internally threaded expansion anchor with four equally-spaced slots extending from the bottom end of the outer shield, inside of which sits a pre-assembled dilating plug. Placed in a pre-drilled hole the anchor will sit flush in medium to heavy-duty applications in solid materials such as stone and concrete. When the bolt is screwed into the anchor the slots will expand and be fixed in place. It can be used in applications such as overhead assemblies such as duct work and pipe hangers because the internal plug holds its position. Can also be used to anchor handrails and floor-mounted door stops.