Retrofitting Flap Stays for Nolte Kitchens

A flap stay controls the smooth opening and closing of cabinet fronts upwards or downwards, reliably holding them in the desired position.

Wall units with flap doors are standard in modern kitchens. However, if the front no longer stays in the open position or drops down unchecked, the lifting mechanism is worn out. This frequently affects older kitchen layouts where the pneumatic force of the struts has degraded. Anyone looking for replacement parts or wishing to upgrade a basic cabinet functionally needs components that align precisely with the existing hole patterns. Furnica provides technical solutions designed to suit Nolte and other established kitchen systems.

In this guide, you will learn what to look for when selecting the mechanism, how to calculate the required force, and how to carry out the installation properly.

Checking Compatibility: Dimensions, Hole Pattern, and System 32

Before installing a new fitting, compatibility with the carcase must be ensured. Hole spacing is the foundation of cabinet construction – if it does not match, no fitting will fit without extensive modification. Most industrially manufactured kitchen cabinets are based on System 32.

This means:

• The distance between the centres of two vertical drill holes is exactly 32 mm.
• The distance from the front carcase edge to the first row of drill holes is typically 37 mm.
• The drill diameter for the fixing screws or Euro screws is usually 5 mm.

If you are looking for a fitting as an alternative to Nolte original parts, first measure the existing hole pattern inside the cabinet. The mounting plates of the new stays must match this line drilling precisely so that they can be secured without drilling new holes.

In addition to the stay itself, flaps are usually attached with hinges to the top or bottom edge of the carcase. A standard concealed hinge is typically used for this. The standard drilling diameter for the hinge cup in the front is 35 mm. Ensure that the opening angle of the hinges (typically 95° or 110°) matches the maximum stroke length of the flap stay to prevent the hinges from tearing out.

Calculating the Correct Force: Newtons and Flap Weight

A common mistake when replacing hardware is choosing the wrong weight rating. A pneumatic gas strut is specified in Newtons (N). If the damper is too weak, the door falls shut. If it is too strong, closing the cabinet requires significant effort.

The required force depends on two factors:

1. The height of the front (in mm).
2. The weight of the front including hardware fittings (in kg).

A lightweight front made of melamine-faced chipboard requires significantly less force than a heavy version made of solid MDF or with a glass insert. The weight of the kitchen handles must also be added to the front weight.

Common force ratings for kitchen wall units are 200 N, 250 N, 320 N, or 400 N. For particularly heavy and large fronts over 600 mm in width, you will definitely require gas struts for heavy flaps. It is strongly recommended to install a strut on both sides – left and right inside the carcase – for front widths from 400 mm upwards. This prevents the front from twisting and relieves strain on the hinges.

Choosing the Right Mechanism: Opening Upwards or Downwards?

Depending on the layout of the kitchen units, the front opens upwards or downwards. The mechanics differ fundamentally between the two.

Lift-Up Cabinets (Upward Opening)

Here, the front is lifted and must counteract gravity. Flap stays with gas strut technology or mechanical stays are used. From a certain angle, the gas strut pushes the front open automatically and holds it in the end position. The actual rotational movement is facilitated by the concealed hinge on the top panel.

Drop-Down Flaps (Bar Cabinet Principle)

When the front opens downwards, it must not drop unchecked; otherwise, the hinges (usually a full overlay on the bottom panel) will tear out of the wood. A drop-down flap stay or a cable stay is used in this case. These fittings brake the downward movement and stop the front precisely at 90°.

Kitchen planning tip: If you are dismantling or upgrading the wall unit anyway, check the internal fittings as well. A plate rack for wall cabinets can be easily retrofitted into flap cabinets above the sink. For the base cabinets below, suitable kitchen cabinet pull-outs and a kitchen drawer organiser are ideal for optimising storage space utilisation.

Step-by-Step Guide: Retrofitting or Replacing a Flap Stay

Replacing or installing new fittings can be carried out precisely with the correct tools.

Required tools:

• Cordless screwdriver
• Crosshead screwdriver (PZ drive for chipboard screws)
• Folding rule (tape measure)
• Bradawl

Step-by-step installation:

1. Removing old parts: Release the front from the hinges to work safely. Remove the old stays from the carcase and the front. For gas struts, simply lever the old strut off the ball stud bracket using a flat-head screwdriver.
2. Checking the hole pattern: Measure the distance between the old screw holes. When using parts compatible with Nolte, the new carcase mounting plates generally fit into the existing 32 mm line drilling.
3. Fitting the carcase bracket: Screw the mounting plate securely to the inside of the carcase. Use suitable Euro screws if 5 mm holes are already present.
4. Fitting the front bracket: Screw the counterpiece to the inside of the front. Follow the manufacturer's specified measurement for the distance from the door edge (often 28 mm or 37 mm).
5. Clipping in the mechanism: Attach the damper or mechanical stay onto the mounting plates. For ball studs, the component clicks securely into place with an audible snap.
6. Fine adjustment: Clip the front back into the hinges. Adjust the alignment using the adjustment screws on the concealed hinge (height, depth, lateral overlay). On mechanical drop-down stays, you can now adjust the braking effect to match the front weight using a hex key.

Frequently Asked Questions (FAQ)

Can I repair a faulty gas strut? No. A gas strut is a sealed, pressurised system. If the gas has escaped and the lifting power is lost, the entire component must be replaced.

Is a single stay enough for my cabinet flap? For small and lightweight fronts (e.g. 300 mm width), a single fitting is often sufficient. From a width of 400 mm or when using heavier materials (MDF, glass), installing two stays (left and right) is mandatory; otherwise, the front may warp during closing and put uneven strain on the hinges.

What is the difference between soft-close and push-to-open on flaps? These two systems are technically opposite. Soft-close is a damper that cushions the closing front over the final centimetres and pulls it shut silently. Push-to-open (or tip-on) is an ejection mechanism for handleless fronts: pressing the front pops it open slightly. A classic soft-close damper cannot be combined with a push-to-open mechanism.