Tall pantry doors, wide wardrobe fronts and stone-clad kitchen panels look impressive on a drawing. They also change how the cabinet has to work. A hinge that works on a standard 600 mm kitchen door can sag, bind or lose its damping on a taller, thicker or heavier panel. For architects, interior designers, kitchen designers and cabinetmakers, hinge specification is not a finishing detail. It is a structural decision that should be made while door sizes are still being resolved.
GRASS ZA supplies premium furniture fittings and architectural hardware in South Africa, including GRASS concealed hinges for kitchens, cabinetry and interior joinery. The question is how to match weight, geometry and use to a hinge that sits square after years of opening.
Why large doors need a different specification
Most problems start with the idea that a concealed hinge is interchangeable.
A wider door increases the lever arm from the hinge axis to the centre of the panel. That extra torque is what pulls the top hinge out of line. A taller door asks the same fittings to keep a long edge parallel, so quantity and spacing become as important as the hinge itself. Thickness adds mass and geometry. A 22 mm or 24 mm door, an aluminium frame door, or a front faced with glass, mirror or stone does not behave like a standard 16 mm or 18 mm board.
Start with the door, not the catalogue page
Before choosing overlay or opening angle, record the facts that drive the specification:
- Finished height, width and thickness
- Construction and facing, including solid timber, thick board, glass, mirror, aluminium frames or mitred edges
- Estimated weight, including handles and applied finishes
- Carcass type: frameless or face frame, full overlay, half overlay or inset
- How far the door must open, and whether appliances or stone returns restrict the swing
Those notes prevent two common errors: specifying a full overlay hinge where two doors share a centre panel, and under-hinging a door because it looked “about standard” on the elevation.
Overlay, thickness and opening angle
Concealed hinges are specified by the way the door sits on the carcass. Full overlay is usual on contemporary frameless kitchens, where the door covers the side panel. Half overlay is required where two doors share one partition. Inset doors sit flush with the cabinet face and leave little room for drilling error. Mixing these up produces binding doors and uneven reveals.
Door thickness must sit inside the hinge’s working range. GRASS Tiomos covers a wide band of furniture door thicknesses, with doors up to 24 mm fully supported in typical applications, and specialist versions for thin fronts, glass and mirror, aluminium frames and mitred constructions. Unusually thick or profiled doors need to be flagged early so the correct cup, cranking and mounting plate can be chosen.
Opening angle should follow the way the space is used. A 110 degree hinge is enough for many kitchen units. Wider options, including Tiomos 155, are useful on corner units, appliance housings and furniture where the door must swing clear of internals.
How many hinges, and where they sit
Hinge quantity depends on height, weight, door width, material and how securely the cup and mounting plate are fixed. GRASS application charts relate height and weight to two, three, four or five hinges. A trial mounting is recommended when a door sits outside standard kitchen sizes.
- Keep the distance between the top and bottom hinge as wide as the door allows.
- Add hinges as height and mass increase, rather than hoping a heavier pair will do the work of three or four.
- Use every fixing hole in the mounting plate.
- Treat extra weight from stone, tile, mirror or solid timber as a change of specification.
The top hinge carries a disproportionate share of the load. If it is undersized or poorly fixed, the door drops at the handle side first. That is usually described as a door problem. It is almost always a hinge and installation problem.
Soft-close and adjustment on heavier fronts
Large doors also have to close in a controlled way. An undamped heavy door slams. An over-damped door feels sticky and may not latch. Tiomos integrates the damper in the hinge arm and offers three-stage soft-close adjustment, so the same family can be set for lighter fronts or for large, heavy doors. Three-dimensional adjustment then lets the installer set even gaps after the carcass has moved a fraction. Tiomos is also tested well beyond typical furniture-cycle expectations, with GRASS conducting tests of up to 100,000 cycles. That does not replace correct quantity and fixing, but it shows the hinge is intended for doors opened every day.
When a hinged door is no longer the right answer
There is a point at which a large swinging door starts occupying the room. Full-height wardrobe walls, appliance recesses and flush architectural fronts often work better as sliding, folding or pocket systems. GRASS ZA also supplies Hawa architectural hardware, including pivot and slide-in systems that park the door within the cabinet or wall line. Hardware chosen after the carcass is built is almost always a compromise.
Specify fittings while the drawings are still open
Hinges affect drilling patterns, side-panel thickness, door sizing and handle positions. The cleanest projects are those where furniture fittings are considered with the first joinery drawings.
GRASS ZA represents GRASS movement systems in South Africa and works with specifiers, architects, designers, and joiners from our Cape Town office and Johannesburg showroom and warehouse.
If you are designing tall cabinetry or heavy kitchen doors, review the GRASS hinge range and catalogues before the doors are cut. The GRASS ZA team can help match overlay, angle and hinge count to the project, or talk through an alternative where a swing door is no longer the right answer. Download our GRASS ZA Catalogue here, and make sure you follow us on Facebook and Instagram to stay up to date with all things GRASS ZA.
