The completely concealed hinge system TECTUS enables unrebated doors to be completely flush and therefore integrated into rooms designed with straight lines. When closed the door will remain visible, with an invisible hinge system. TECTUS carries load capacities up to 300 kg, enables an opening angle of 180 degrees and can be used on timber, steel and aluminium frames. Three-dimensional adjustment and maintenance-free slide bearing technology are used for high-quality interior doors and functional heavy-duty doors. All model versions have a uniform appearance, with a sideways closed hinge body for a flush mortise appearance. They differ in terms of their dimensions and the load capacities they carry – as well as in their broad spectrum of application areas, such as on timber entrance doors, recessed model versions for invisible frames, variants with intumescent kits and versions with integrated energy transfer.