Gas Struts and Flap Stays as Replacements for Nobilia Kitchens

A flap stay or gas strut supports furniture fronts upwards or downwards and is primarily specified according to the required force in Newtons and the installed length in mm.

When a kitchen wall unit flap no longer stays open on its own or drops down unchecked when closing, the lifting mechanism is usually worn out. In many fitted kitchens, the installed dampers lose their internal pressure after a few years. For fitters and experienced DIYers, replacement is straightforward provided the technical parameters of the replacement part match precisely. furnica provides fittings that can be used as an alternative for Nobilia and other popular kitchen brands.

In this technical guide, you will learn how to determine the correct dimensions, choose the right force curve, and replace the fitting professionally.

What to Look for Regarding Flap Stay Compatibility?

A flap fitting must be matched precisely to the weight and leverage of the respective furniture front. If you are looking for a replacement part suitable for Nobilia wall units, three technical values are crucial:

1. Spring Force in Newtons (N)

The load capacity of a gas strut is always specified in Newtons. On the cylinder of the defective old part, you will usually find a printed marking such as '250 N' or '380 N'. This value must match on the replacement part. If a damper that is too weak is chosen, the flap will fall shut. If the value is too high, the cabinet can only be closed with considerable force, which will eventually tear the hinges out of the chipboard. Common ratings for kitchen cabinets range from 150 N to 450 N.

2. Installed Length and Stroke

Measure the old damper in its fully extended state. The measurement is taken from the centre of one fixing eyelet to the centre of the other eyelet. Typical lengths range between 250 mm - 280 mm. The stroke describes the distance the piston rod travels into the cylinder. If the overall length matches, the cylinder will generally fit onto the existing mounting plates in the carcase without issue.

3. Hole Pattern and Fixing

Most kitchen manufacturers produce their carcases according to System 32. This means that the line borings for shelf supports and mounting plates are spaced exactly 32 mm apart. When installing replacement parts, the new fixing brackets can usually be screwed directly into the existing 5 mm holes.

Suitable Replacements for Heavy Flaps and Bi-Fold Cabinets

When selecting a fitting, a strict distinction must be made based on the opening direction. A mechanism that opens upwards operates entirely differently from one that opens downwards.

Upward-Opening Flap Stays

For classic wall units (microwave compartments, spice cupboards), compression struts are used. They push the front open automatically from a certain angle and hold it in place. A well-matched flap stay operates like a shock absorber on a car — it cushions the weight smoothly and holds the position reliably.

These stays always work in conjunction with overhead hinges. When replacing the damper, it is often worthwhile checking the hinges as well. If they are worn, you can use compatible concealed cabinet hinges as a replacement. For standard flaps, 110-degree concealed cabinet hinges are usually suitable. If you want the flap to close softly, combining the gas strut with soft-close concealed cabinet hinges is recommended. Pay attention here to the correct cup hole, which is almost always 35 mm in kitchen cabinets, as well as the mounting type, such as full overlay for surface-mounted fronts.

Downward-Opening Flap Stays (Braking Flap Stays)

For drinks cabinets or media units that open downwards, you require a braking flap stay. A gas strut that pushes the flap open must not be installed here. Instead, this mechanism brakes the fall of the front and stops it at exactly 90° to relieve the strain on the hinges at the bottom edge. Selection here is also based on the front weight in kg.

Installation and Retrofitting: How to Carry Out the Replacement

Replacing a defective flap fitting requires careful work, but can be completed in a short time.

Required tools:

• Cordless screwdriver or screwdriver with a Pozidriv (PZ2) bit
• Tape measure or folding rule
• Bradawl or 3 mm wood drill bit if required

Step-by-Step Installation:

1. Disassembly: Open the cabinet flap and support it (or have a second person assist you). Most cylinders are clipped onto ball studs. Remove the small metal retaining clip with a flat-head screwdriver and pull the damper off the ball stud.
2. Checking the brackets: Are the round mounting plates on the carcase and front still secure? If the screws (usually 4 mm in diameter) are loose, fill the old holes with wood filler or use slightly thicker repair screws.
3. Fitting the new parts: If the old ball studs do not fit the new stay, screw on the new mounting plates. Adhere to the specified hole pattern.
4. Snapping into place: Press the sockets of the new damper onto the ball studs until they audibly engage. Important for oil-damped gas struts: the thick cylinder should point upwards when closed so that the seals remain lubricated.

Further Compatible Replacement Fittings for Nobilia Kitchens

In addition to flap fittings, other moving parts also wear out in a heavily used kitchen. When planning repairs or upgrades, accurately fitting alternatives are available for virtually every component.

• Runners and drawers: If the runners stick or the soft-close mechanism fails, you can replace the runners. furnica provides compatible runners suitable for Nobilia carcases. For example, if you are repairing a narrow pull-out larder unit, you often need a kitchen cabinet 20 cm pull-out runner. For wide pan drawers, a kitchen cabinet 60 cm pull-out runner as a full extension with a suitable load capacity (e.g. 30 kg) is the right choice.
• Internal fittings: To make the most of storage space after a repair, the interior layout can be reorganised with a kitchen drawer organiser. For wall units above the sink, retrofitting a plate rack insert for wall units is a practical addition.
• Plinth feet: If the kitchen needs releveling or old plastic legs have broken, they can be replaced. Compatible furniture legs usually feature an M8 or M10 thread and are continuously height-adjustable (e.g. from 100 mm - 130 mm) to compensate for uneven floors.

FAQ: Frequently Asked Questions About Replacing Flap Fittings

How do I calculate the required force in Newtons if the print is missing? Weigh the furniture front (including the handle). As a rough rule of thumb, 1 kg of front weight requires approximately 10 N of spring force. Add a leverage allowance depending on the flap height. For a 400 mm high flap weighing 3 kg, you generally require two dampers of 150 N to 200 N each.

Can I replace a cable-stay flap mechanism with a gas strut? This is technically possible, but requires new drill holes. A cable stay typically requires less installation depth. If you switch to a cylinder, you must mark out the exact installation dimensions (distance from the carcase front edge) according to the instructions of the new fitting and pre-drill with a 3 mm bit.

Can furnica concealed hinges be used as replacements for Nobilia soft-close hinges? Yes, provided the technical parameters match. Check the cup diameter (usually 35 mm), the drilling pattern for the fixing screws (often 45 mm or 52 mm spacing), and the position of the cruciform mounting plate in the carcase. If these dimensions are identical, replacement is straightforward.

Why does my flap not close flush after replacement? If the flap stands proud, either the selected spring force in Newtons is too high, or the position of the mounting plates deviates by a few millimetres. Check whether the damper is bottoming out (fully compressed) when closed. If this is the case, the mounting plate on the front must be moved by 2 mm - 3 mm towards the hinges.