Can be designed with spherical bushings at the mounting holes or with double hinge pins to provide a second degree of freedom for the hinge. This allows the door to be pulled in straight against various types of critical seals (from pressure seals to RF/EMI gaskets and RF/EMI "knife edges").

Caution! In order to assure that the door pivots about the vertical axis only, it may be necessary for the door manufacturer to attach a stiffener between the top and bottom door leaves if any door "sag" occurs. The stiffener shall be of adequate strength and rigidity for that particular application.