Accessibility Statement


This single-action concealed hinge offers exceptional strength, security and smooth operation. While the same height as another 4 5/8" high SOSS invisible hinge we carry, this heavy-duty version requires a greater minimum material thickness of 1 3/4".

It seats flush in a deep mortise to resist sagging, remaining inconspicuous and tamper-resistant when closed. The interlinked laminated steel plates, with nylon links for added durability, move smoothly and silently, opening 180°. Cast in heavy-duty zamak with a black finish.

Easily installed with a drill in wooden doors and frames. Instructions, screws and drilling template included. To determine the size and number of hinges needed per standard door, consult the Specifications tab.

cULus listed for use on swinging-type fire doors and frames with a 20-minute UL fire rating. For fire-rated doors, use at least one fire-rated hinge for every 20" of door height or portion thereof or for every 60 lb or fraction thereof, whichever calculation requires more hinges.