Hinges Explained: Soft-Close, Hydraulic and Lift-Up

The hinge is the smallest part of a wardrobe or kitchen and the one people touch most. A tall wardrobe shutter in an Indian home may be opened and closed ten to twenty times a day; over ten years that is tens of thousands of cycles, in a climate that swings from dry winter to saturated monsoon. Cheap hinges show it first: the shutter drops at the handle side, the gap at the top becomes a wedge, the door bangs, the screws loosen in the board, and eventually the hinge cup tears out of the shutter. Most of the complaints that families make about "bad carpentry" five years after moving in are really hinge, screw and board problems.

The vocabulary does not help. Carpenters and dealers talk of auto hinges, hydraulic hinges, soft-close hinges, slow-motion hinges, clip-on hinges, 0-crank, 8-crank and 16-crank hinges, flap stays, gas pumps, lift-ups and Aventos-type systems, often meaning overlapping things. A client who asks for "hydraulic" may get a soft-close hinge, a gas strut or a separate damper, at very different prices.

This article untangles the terms. It explains how the modern concealed hinge works, how overlay and crank decide where the shutter sits, how many hinges a shutter needs, what soft-close and hydraulic actually mean, and how to choose a lift-up system for overhead cabinets. Dimensions are in millimetres and follow the 32 mm cabinet system used by most Indian factories and modular brands; prices are indicative October 2026 ranges consistent with the wardrobe and kitchen cost guides on this site.

From butt hinge to concealed hinge

For most of history, a cupboard door hung on a visible hinge. Indian carpenters used butt hinges — two leaves of brass or steel joined by a pin, screwed into the edge of the door and the frame — and piano hinges along the full length of a lid. Traditional almirahs and teak cupboards often used decorative brass strap hinges, and steel almirahs used concealed pin hinges welded into the frame. These hinges are strong and simple, but they need a face frame, they cannot be adjusted once fixed, and the door sits inside or on top of the frame in one fixed position.

The modern concealed hinge was developed in Europe in the second half of the twentieth century, alongside frameless "32 mm system" cabinets made from particleboard and, later, MDF and plywood. Instead of a leaf screwed to the door edge, the hinge has a round cup set into a 35 mm hole bored in the back of the door, and an arm that clips onto a mounting plate screwed to the inside of the cabinet side. Because the arm can be adjusted with screws, the door can be moved sideways, up and down and in and out after installation — something a butt hinge cannot do. That adjustability is what made factory-made modular furniture practical, and it is now standard in Indian modular kitchens and wardrobes.

The next step was damping. Integrated soft-close dampers — small oil-filled cylinders built into the hinge arm or cup — became mainstream in Europe and then in India over roughly the last two decades. They are what the Indian trade usually calls "hydraulic" hinges. Lift-up mechanisms for overhead cabinets developed in parallel, from simple metal flap stays to gas struts and, at the top end, spring-loaded lift systems with built-in dampers.

Anatomy of a concealed hinge

A concealed hinge has four parts. The cup is a pressed steel bowl, 35 mm in diameter for standard hinges, set into a hole about 11–13 mm deep in the back of the shutter. The arm connects the cup to the cabinet and carries the hinge mechanism — usually a four-link or multi-link pivot that swings the door out and away from the carcass as it opens, so the door edge clears its neighbour. The mounting plate is screwed to the inside face of the cabinet side, and the arm clips or slides onto it. The adjustment screws on the arm move the door sideways, in depth, and — on most plates — in height.

Three dimensions decide where the door ends up. The cup boring distance, often marked K in hinge leaflets, is the gap between the shutter edge and the edge of the 35 mm hole — commonly 3–6 mm. The mounting plate height, or plate thickness, sets how far the arm stands off the side panel. The crank of the arm decides whether the door covers the full panel, half of it, or sits inside it. Together they produce the overlay: how much of the cabinet side the door covers. The 37 mm setback of the mounting plate screws from the front edge of the carcass comes from the 32 mm system, in which holes are drilled 37 mm from the front edge and at 32 mm centres, so that hinges, shelf pins and drawer runners all share one drilling pattern.

The cup hole matters more than it looks. A 35 mm hole of 11–13 mm depth in an 18 mm shutter leaves only 5–7 mm of material behind the cup. That is fine in good plywood, HDHMR or MDF, but in a soft or poorly bonded board the cup tears out under a heavy door. That is why shutters for tall wardrobes are usually 18 mm and never thinner than 16 mm for concealed hinges, and why manufacturers sell hinges for thick doors when shutters are 25 mm or more with a cladding.

Overlay and crank: full, half and inset

The single most common hinge mistake on Indian sites is the wrong crank. A full-overlay door covers the whole front edge of the cabinet side; it is used on the end panels of a cabinet run and on any panel that carries only one door. A half-overlay door covers half of a shared middle panel, so that two doors can hinge off the same 18 mm partition with a small gap between them. An inset door sits inside the carcass, flush with the front edges, for a framed or furniture-like look. Each needs a different arm shape — called the crank — and the dealer's shorthand of 0, 8 and 16 refers to roughly how far the arm is cranked, in millimetres.

Opening angle and special hinges

A standard concealed hinge opens to about 95–110°, which is enough for most shutters. Where internal drawers or pull-outs sit directly behind the door, the shutter must open wider so that its thickness clears the inner opening; wide-angle hinges of about 155–170° solve that, as do zero-protrusion hinges that swing the door fully clear of the carcass line. Angled hinges set at 15°, 30° or 45° hang doors on angled corner cabinets. Glass hinges grip or bond to 4–6 mm glass without a bored cup. Each of these costs more than a standard hinge, and each should be specified on the joinery drawing, not improvised on site.

Soft-close and hydraulic: what the words mean

A soft-close hinge has a damper — a small cylinder filled with oil or a similar fluid, sometimes called a hydraulic or slow-motion damper — that resists the door's motion in the last few degrees of closing. The door swings freely until about 15–30° from closed, then slows and pulls itself shut quietly. In Indian trade language, a "hydraulic hinge" almost always means exactly this: a concealed hinge with an integrated soft-close damper. It does not mean a different kind of hinge, and it does not carry more weight than a normal hinge of the same quality.

There are three ways to get soft closing. The integrated soft-close hinge has the damper built into the cup or arm; it is the neatest, and on good makes the damping force can be switched off on individual hinges. The clip-on damper is a separate small unit that clips onto a normal hinge arm and adds damping to existing furniture. The separate bumper or door damper is a small piston screwed into the carcass that the door touches as it closes. Push-to-open systems, used on handle-less shutters, work differently — a spring latch pushes the door open when pressed — and generally need non-damped hinges or special combined hardware.

Two practical points follow. First, the number of dampers should suit the door. A light 600 mm shutter with two strong soft-close hinges may close too slowly or not latch fully; many makes allow the damper on one hinge to be deactivated. A heavy tall shutter may need every hinge damped. Second, dampers are temperature- and age-sensitive: a cheap damper that works in the showroom may slam in a cold winter morning or leak oil after a few hot summers, which is why the cheapest "hydraulic" hinges are a false economy on wardrobes that are used every day.

These per-piece ranges fit the hardware upgrade band used across this site's wardrobe and kitchen guides. A four-shutter, 2100 mm tall wardrobe needs about 16 hinges; at branded soft-close rates of ₹350–900 that is roughly ₹5,600–14,400, against about ₹1,900–4,800 for budget soft-close and under ₹2,000 for normal hinges. Add drawer channels and the upgrade lands inside the ₹5,000–15,000 per wardrobe band quoted elsewhere on this site.

How many hinges does a shutter need?

The number of hinges depends on the shutter's height, width and weight. Manufacturers publish charts for each hinge model; the figures below are typical of those charts for 18 mm board shutters up to about 600 mm wide, and should be treated as a minimum. Wider shutters, mirror-clad or glass-clad shutters, and shutters with heavy handles or accessories mounted on the back need one more hinge than the table suggests. Hinges are placed about 80–120 mm from the top and bottom edges, with the others spaced evenly between, and never where they would clash with a shelf or a drawer.

Board choice matters as much as the hinge count. Tall shutters bow in humid weather if the board is unstable or if the two faces are finished differently — laminate on the front and nothing, or a thin balancing laminate, on the back. A shutter that bows by even 3–4 mm will not close evenly no matter how many hinges it has. That is why this site's board guides recommend stable cores and balanced finishes for tall shutters, and why a shutter taller than about 2100–2400 mm is often better split into a main shutter and a separate loft shutter.

Lift-up systems for overhead cabinets

Overhead kitchen cabinets are where hinge choice most affects daily comfort. A side-hinged overhead shutter swings into the cook's head space and must be closed after every use; a shutter that lifts up stays out of the way while both hands are busy. Indian kitchens use four main lift types. The gas strut or flap stay — often called a hydraulic pump or gas pump by dealers — is a gas spring that holds a top-hinged flap open; it is cheap but the flap swings out and up in an arc, so it needs head room and a good stop. The lift-up system lifts the shutter up and over the cabinet top while staying roughly parallel to the front. The bi-fold lift folds a two-part shutter in the middle as it rises, suiting tall overhead cabinets in rooms with limited ceiling space. The vertical lift slides the shutter straight up, parallel to the cabinet face, for tall units with very little space above.

Lift systems are sized by the shutter's weight and height, often combined into a single power factor in the manufacturer's chart. A glass-framed or acrylic-faced flap can weigh twice as much as a laminated one of the same size, and an undersized mechanism lets the flap drift down or slam. The reach matters too: the open handle edge of a flap should stay within comfortable reach of the shortest regular user — indicatively around 1850–1950 mm above the floor for many Indian households — or it will be pulled down with a stool or a ladle handle. Where the household includes elderly users or the cook is short, a vertical lift or simply lower overhead units are the better answer.

Budget accordingly. A typical L-shaped kitchen with four to six overhead units can spend ₹2,000–7,000 on gas struts or ₹25,000–80,000 or more on branded lift systems — a large difference for the same storage. Many families split the choice: lift systems on the two or three units used daily near the hob and sink, and plain soft-close hinges on the rest.

Finishes, corrosion and screws

Most concealed hinges are nickel-plated steel, which performs well in dry rooms. In kitchens, bathroom vanities, utility rooms and coastal or very humid cities — Surat, Mumbai, Chennai, Kochi — corrosion resistance matters more. Manufacturers rate plating by salt-spray tests, and stainless-steel hinges, usually grade 304, are available for wet areas at a premium. Black, champagne and other coloured finishes are coatings on steel and should be checked for the same resistance. A hinge that rusts at the cup also stains the board around it.

The screws are the other half of the hinge. Concealed hinges are designed for specific screws — usually about 3.5–4 mm chipboard or euro screws — or for press-fit dowels in pre-drilled holes. In plywood and HDHMR, correctly sized screws hold well; in MDF, screw holding at the face is good but at the edge it is weak, so mounting plates should be screwed into the face of the panel, never into an edge. Oversized wood screws driven in by hand split thin boards; undersized screws pull out. Repeated over-tightening strips the hole, which is why a hinge that has been adjusted too many times often needs a hole repair with a dowel and adhesive before it holds again.

Where hinges and lifts are going

Furniture hardware is moving in three directions. First, quieter and more invisible: slimmer hinge arms, hinges with integrated cover caps and colour-matched finishes for handle-less designs. Second, motion assistance: electric push-to-open drives and powered lift systems for overhead units, already common at the premium end and likely to become more affordable, especially for elderly users. Third, durability information: more makers publish cycle-test figures and refer to European furniture-hardware standards, which helps buyers compare. None of this changes the basics — correct crank, enough hinges, stable boards and the right screws — but it widens the choice at the top end.

Rules for choosing hinges and lift-ups

• Specify hinges on the joinery drawing: make, overlay or crank, opening angle and number per shutter.
• Use full overlay on end panels and half overlay on shared middle panels; use inset only with skilled carpentry.
• Follow the hinge count by height: 2 up to 900 mm, 3 to 1600 mm, 4 to 2000 mm, 5 to 2400 mm — add one for mirrors or glass.
• Buy branded soft-close hinges for daily-use tall shutters; budget hinges are acceptable on rarely used units.
• Use wide-angle or zero-protrusion hinges wherever drawers or pull-outs sit behind a door.
• Size lift systems by shutter weight and height, and check the open position against ceiling, chimney and user reach.
• Choose stainless or high-rated finishes in kitchens, wet areas and coastal or very humid cities.
• Use the screws the hinge is designed for, fix plates into panel faces, and readjust all doors two to four weeks after installation.

Frequently asked questions

Are hydraulic hinges and soft-close hinges the same?

In most Indian shops, yes. "Hydraulic" refers to the small oil-filled damper inside a soft-close hinge that slows the door before it closes. The same word is sometimes used for gas struts on lift-up flaps, so always ask whether the quote means a hinge, a damper or a lift mechanism.

What is the difference between 0, 8 and 16 crank hinges?

They describe how the shutter meets the side panel. A 0-crank (straight arm) hinge gives full overlay, covering the whole 18 mm panel edge. An 8-crank hinge gives half overlay, so two doors can share one middle panel. A 16 or 18-crank hinge is for inset doors that sit inside the carcass.

How many hinges should a wardrobe door have?

A typical 1800–2100 mm wardrobe shutter up to 600 mm wide needs four hinges, and five if it is close to 2400 mm, mirror-clad or unusually heavy. Kitchen shutters up to 900 mm tall need two.

Which is better for kitchen overheads — gas strut or lift-up?

Gas struts are cheap and fine for short flaps used occasionally, but the flap swings out into head space. Branded lift-up, bi-fold or vertical-lift systems cost more but keep the shutter out of the way and close softly, so they are worth it on the two or three overhead units used every day.

Why does my soft-close cabinet door not shut completely?

Usually because the damping is too strong for a light door, or the shutter has bowed. Many soft-close hinges let the damper be switched off on one hinge; if the door is warped, adjustment will not fix it and the shutter needs replacing or rebalancing.