The assembly device is intended for the pivoting attachment of at least two components (M1, M2). It comprises a screw (4) intended to be screwed into a first component (M1) and bearing a guide pin (5) guiding the pivoting of a second component (M2). According to the invention, the pin (5) comprises at least one rotation-prevention zone (540) having a shape designed to collaborate with a zone of corresponding shape of the first component (M1), so as to prevent said pin from rotating.