A hinge has two housings adapted to be recessed in a door frame and a door edge and a link assembly extending between the housings and having ends pivoted in the housings. A vertically shiftable support body in one of the housings has a row of teeth extending horizontally in a first direction. A bearing block sitting on the support body forms a pivot for the respective end of the link assembly. A screw extending through the bearing block and threaded into the support body is tightenable to bear on and fix the bearing block on the support body. A gear captured in the seat of the bearing block meshes with the row of teeth and is rotatable to shift the bearing block on the support body in the first horizontal direction in an untightened condition of the screw.