ST-80 Pivot Hinge
The ST-80 brass center pivot hinge is employed when a minimum of visible hardware is desired or when the door must swing free of its frame. It is mortised into the top and bottom of the door and frame; only the pivot is visible. The leaf measures 51 mm x 13 mm x 5 mm.
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I used the ST-80 because my doors are fairly heavy (4/4 Paduak) and I wanted to make sure there was no sag. The hinges worked great and are as smooth as silk.