Abstract: An improved blind nut of the type sometimes referred to as an expansion bolt anchor is disclosed. It is characterized in that it is a single unitary piece of resilient material shaped to provide a thread engaging portion and having outwardly extending wings which, in normal unstressed position, have a length longer than a dimension of the wall or panel opening into which insertion is intended. The blind nut is deformed as it is inserted and the wings spread after insertion through a panel opening to prevent removal and are caused to be drawn flat against the back of the panel as the attaching bolt is threaded through the blind nut.