Retrofitting Flap Stays for Alno Kitchens
A gas strut or mechanical flap stay supports and guides furniture fronts upwards or downwards in a controlled manner, with the required force needing to match the flap weight precisely in Newtons.
Replacements for Defective Kitchen Flap Stays
Upward-opening fronts are the standard for wall cabinets in kitchen units. They provide head clearance and direct access to cabinet contents. Over the years, however, built-in lifting mechanisms suffer from natural wear and tear. Especially in systems operating with pressurised gas, minimal amounts of gas escape over a long period, which reduces the lifting force. The result: the flap no longer holds in the open position and drops down uncontrolled.
When the hinges and dampers in an older fitted kitchen fail, a complete replacement of the cabinet is not necessary. For fitters and experienced DIYers, retrofitting or replacing the fittings is a routine task. If you are looking for replacement fittings for an Alno kitchen, universal components manufactured strictly to industrial standards are an ideal solution. The flap stays available from us are fully compatible with Alno and integrate seamlessly into existing carcasses, provided technical parameters such as hole spacing and force rating match.
What to Look for Regarding Compatibility: Dimensions and Force
When replacing a fitting, pure mechanics determine the accuracy of fit rather than the printed brand name. To find a suitable replacement part, three key factors must be determined:
1. Spring Force in Newtons (N)
The load capacity of a damper is always specified in Newtons. This value is usually printed on the cylinder of the old component (for example 250 N, 320 N, or 450 N). As a rule of thumb: 10 N corresponds to a lifting force of approximately 1 kg. The exact force is crucial. If the value is too low, the flap drops down. If it is too high, the cabinet can only be closed with substantial effort. To calculate the front weight, the material (MDF, chipboard, solid wood) must be set in relation to the dimensions (height by width in mm). The weight of the kitchen furniture handles must also be included in the calculation.
2. The Hole Pattern and System 32
In European furniture construction, carcass design is generally based on System 32. This means that the pre-drilled rows of holes inside the cabinet are spaced exactly 32 mm apart. The standardised distance from the front edge of the cabinet to the first hole is also 37 mm. A compatible fitting uses precisely these spacings for its mounting plates.
3. Installation Length and Stroke
Measure the old damper in its fully extended state. The length is measured from the centre of the top fixing eyelet to the centre of the bottom ball socket. Common lengths range between 245 mm and 270 mm. The stroke describes the travel distance of the piston rod when retracting into the cylinder and defines how far the flap opens (often 75°, 90°, or 110°).
Suitable Alternatives: Types of Flap Stays
Depending on the construction of the wall unit, different technical solutions are used. The mechanism works similarly to a boot damper on a car: it assists the manual movement and cushions it at the end positions.
Gas Strut Flap Stays (Upward-Opening)
This is the most common option for classic wall cabinets. A cylinder filled with nitrogen pushes a piston rod out. These systems are maintenance-free and run extremely smoothly. They are ideal for cabinets fitted with a wall cabinet dish drainer rack, as the front swings safely and fully out of the working area when handling wet crockery.
Heavy-Duty Systems for Large Fronts
For particularly wide or thick fronts (for example made of solid oak wood or with heavy glass inserts), standard dampers are insufficient. This is where gas struts for heavy flaps come into play. These fittings have nominal ratings ranging from 400 N to over 500 N. For extremely wide fronts from 800 mm in width upwards, it is essential to fit a damper on both sides of the carcass to prevent the front from warping and hinges from tearing out.
Flap Stays with Braking Action (Downward-Opening)
A bar compartment or media unit requires entirely different kinematics. Here, the flap opens downwards. A braking flap stay prevents the front from dropping down unchecked and tearing the concealed hinges out of the wood. These stays often operate purely mechanically via friction, which can be adjusted precisely to the weight of the flap using an adjusting screw.
Cable-Stay Systems
A technically sophisticated solution is the cable-stay flap mechanism. In this setup, the mechanism is housed in a slim casing on the inner wall of the cabinet. A stainless steel wire cable leads to the front. These systems are exceptionally space-saving and continuously adjustable. They serve well both as an alternative to standard spring stays and for complex installation scenarios.
Fitting and Retrofitting in Wall Units
Retrofitting or replacing a flap stay can be carried out in a short time using basic tools. If you are already optimising the functionality of your kitchen — for instance by installing new kitchen cabinet pull-outs in the base unit or sorting out suitable kitchen drawer organisers — replacing the wall unit mechanism can be integrated directly into the workflow.
Required Tools:
- Pozi screwdriver (PZ2)
- Cordless screwdriver
- Rule or tape measure (in mm)
- Bradawl or centre punch
Step-by-Step Installation:
- Removal: Open the cabinet flap and support it (or have a second person assist you). Release the retaining clips on the ball studs of the old gas spring using a flat screwdriver and pull the damper off.
- Checking the brackets: Check whether the existing mounting plates on the carcass wall and front are secure. If the screw holes are stripped, fill them with wood filler or drill new holes offset by a few millimetres.
- Attaching mounting plates: If you are retrofitting a completely new system, mark the drilling points precisely according to the included dimensional sketch. Ensure the correct distance from the front edge (usually 37 mm). Secure the plates using suitable chipboard screws (Ø 3.5 mm or 4 mm).
- Clicking the damper into place: Press the sockets of the new gas spring onto the ball studs of the mounting plates until they audibly engage. The thicker cylinder should generally point upwards and the thinner piston rod downwards. This ensures proper lubrication of the internal seals.
- Functional test and adjustment: Operate the flap several times. If it does not close flush, readjust the concealed hinges at the top edge of the cabinet using the adjustment screws.
Frequently Asked Questions (FAQ)
Can I replace a 250 N damper with a 350 N damper? This is technically possible, but not recommended unless the weight of the front has changed. A gas spring that is too strong will cause the flap to push forcefully upwards when opening and require significant effort to close. Stick as close as possible to the original N rating.
Are the mounting plates standardised? The ball studs on most gas struts feature a standard diameter. If you are seeking fittings suitable for Alno wall units, you can often leave the old mounting plates in the wood and simply replace the cylinder. Measure the ball stud beforehand to be certain.
Why does my downward-opening flap not close softly? If you have fitted a braking stay for downward-opening flaps and it slams down, the friction setting is too low. Tighten the adjusting screw on the joint of the stay in small increments until the braking force is sufficient to catch the weight of the front.
What is the difference between a flap stay and a concealed hinge? A concealed hinge connects the front to the carcass and defines the pivot angle. The flap stay handles the lifting action and maintains the open position. Both components must work together. For upward-opening flaps, concealed hinges with an opening angle of 90° or 110° without integrated soft-close are commonly used, as the flap stay assumes this function.