European Hardware Solutions Interlock USA is proud to be the exclusive distributor in North America for the complete range of products from Germany's leading manufacturers of European hardware solutions: The SIEGENIA-AUBI Group (SIEGENIA-AUBI & KFV) and Dr. Hahn - all of which stand for innovation, superior quality and excellent service. For more detailed information on our European hardware solutions, browse the pages in this section. Folding DoorLarge opening widths give an impression of breadth and roominess. The FS PORTAL for Fold & Slide doors in wood and vinyl combines superior design with the highest level of functionality, creating... Tilt and TurnThe traditional European window solution for inward-opening applications, this system’s one-hand operation moves the window into a tilt position for secure ventilation and a swing position for an... Casement WindowsInterlock Casement Windows are some of the most advanced hardware products available on the market today. From aesthetic covers and stainless steel operators to revolutionary new locking systems,... Sliding DoorWith the complete range of European sliding door hardware solutions including hardware for Lift & Slide, Tilt & Slide, Inline Slide, Automatic Slide, and a variety of accessories, our European... Swing DoorDesigned to fit single panel and French door applications, Interlock Swing Door Solutions feature single and Multi-Point Mortice locks in various configurations and with a variety of modern handle...