Free preview · Concealed hinges: overlay, angle and soft-close
## What a hinge actually does Every shutter in a modular kitchen hangs on a concealed (cup) hinge: a 35 mm cup bored into the back of the shutter, an arm, and a mounting plate screwed to the carcass side. The hinge decides how the shutter sits against the carcass, how far it opens, and whether it closes gently or slams. ## Overlay types - **Full overlay (straight arm):** the shutter covers the full carcass side. Used on end units. - **Half overlay (slight crank):** two shutters share one 18 mm partition, each covering 8–9 mm of it. - **Inset (deep crank):** the shutter sits inside the carcass, flush with its front edge. Rare in modular work because it needs very tight tolerances. Order the wrong crank and the shutter will either collide with its neighbour or leave a visible gap. Mark overlay type against every shutter on the elevation drawing. ## Opening angle Standard hinges open to 105–110°. Use 155–170° hinges where an internal drawer or basket must slide out past the shutter, and **zero-protrusion** hinges for tall units with inner drawers. Corner blind units need a 30° or bi-fold hinge. ## Soft-close and the number of hinges Integrated soft-close (damper built into the hinge) outperforms clip-on dampers, which go out of adjustment. Hinge count follows shutter height and weight: two hinges up to 900 mm, three up to 1600 mm, four up to 2000 mm, and one more for glass, acrylic or PU shutters, which are heavier. ## Grading quality Ask for the cycle test rating: good hinges are tested to 50,000–80,000 open-close cycles. Check for nickel plating that resists salt spray (coastal cities like Mumbai and Chennai eat cheap zinc plating within a year) and three-way adjustment: side, height and depth, each by ±2 mm.