Flap Stays Suitable for Nobilia Kitchens
A flap stay controls the opening and closing movement of cabinet fronts and holds them securely open at a defined angle.
For wall units in the kitchen, upward-opening flap doors are the most ergonomic solution for overhead clearance. However, if the front no longer stays up on its own or drops down uncontrolled when closing, the fitting is usually worn out. Much like a car's boot lid, the gas inside the cylinder loses pressure over the years, or mechanical brakes wear out.
Anyone looking for replacement parts suitable for a Nobilia kitchen is not dependent on manufacturer-specific original parts. The carcasses of modern fitted kitchens are based on standardised modular dimensions. Defective stays can therefore easily be replaced with compatible standard fittings, as long as the technical parameters match.
What to Look For Regarding Compatibility
For a new fitting to work as an alternative to the installed parts in a kitchen wall unit, three core technical criteria must be checked: the drilling pattern, the force in Newtons, and the type of opening movement.
System 32 and the Hole Pattern
Most industrially manufactured kitchen cabinets use System 32. This means that the pre-drilled rows of holes in the side panels have an exact spacing of 32 mm from one another. The distance from the front edge of the cabinet to the first row of holes is standardly 37 mm.
When replacing a stay, check the hole pattern of the old mounting plates. If the screw holes feature a 32 mm spacing, you can screw compatible mounting plates directly into the existing drill holes. This avoids marking out and drilling new holes into the melamine-faced chipboard.
Lifting Force in Newtons (N)
The most crucial factor for a gas strut is the force required to support the weight of the furniture front. This force is specified in Newtons. On the cylinder of the old damper, you will usually find a printed rating such as "250 N", "320 N", or "380 N".
Select the replacement exactly according to this value. If the strut is too weak, the flap will fall shut. If it is too strong, the cabinet can only be closed with considerable effort, overloading the hinges. On very wide or heavy fronts (e.g. made of MDF with glass inserts), two stays are often fitted per cabinet. In this case, the required force per side is halved.
Direction of Movement: Upwards or Downwards?
A strict distinction must be made between the opening directions:
- An upward flap stay supports the lifting movement and holds the front open against gravity.
- A downward flap stay functions as a drop-down flap stay. It is used for drop-down bar cabinets or overhead units. It does not push the flap open, but gently brakes the fall during opening and locks the front in a horizontal position (usually at 90°).
Compatible Fittings and Their Mechanisms
Depending on the cabinet type and front weight, different mechanisms compatible with standard kitchen carcasses are used. While a kitchen cabinet pull-out 60 cm determines ergonomics in the base cabinet, lifting and flap mechanisms manage it in the wall unit.
Gas Struts for Standard Flaps
The classic gas strut consists of a pressure tube and a piston rod. It is clipped at both ends onto the mounting plates via a ball joint. This is the most common design in wall units. They are available in ratings from 50 N to over 350 N. For heavy doors made of solid wood or with thick mirrors, a flap stay for heavy flaps rated from 250 N upwards is required.
Mechanical Drop-Down Flap Stays
For downward-opening fronts, a mechanical drop-down flap stay is required. These fittings operate using friction. Via an adjusting screw (usually for an Allen key), the braking resistance can be adjusted precisely to the weight of the front. A drop-down flap stay for heavy flaps is often made of solid die-cast zinc to absorb the leverage forces when resting on the open flap.
Cable-Stay Systems
A flap stay with a cable mechanism is particularly space-saving. The mechanism sits in a flat housing on the interior side panel of the carcass, with only a thin steel cable running to the front. These systems are ideal for cabinets with shallow internal depths.
Interaction with Concealed Cupboard Hinges
Flap stays carry the weight, but the pivoting motion is guided by the hinges on the top panel of the cabinet. When replacing the stay, inspect the condition of the hinges. Standardly, concealed cupboard hinges with a 110° opening angle are used here.
For a gentle closing of the flap, combining them with hinges that feature integrated soft-close damping is recommended. If you are looking for a replacement for Nobilia hinges with damping, concealed cupboard hinges with soft close damping are an exact-fit alternative, provided the 35 mm cup diameter and drilling pattern match. The damper in the hinge takes over the soft-close action in the final few centimetres, while the gas strut removes the momentum from the closing movement.
The opening angle of the hinge must match the stroke of the flap stay. A standard wall unit usually uses concealed cupboard hinges 110 degrees. If the flap is intended to open further, the stay's cylinder must be correspondingly longer.
Installation and Retrofitting in Wall Units
Replacing a defective gas damper is a quick job that requires no specialist tools.
Tools Required
- Cordless screwdriver or manual screwdriver (PZ2 drive)
- Tape measure or folding ruler
- Small slotted screwdriver (for releasing securing clips)
Step-by-Step Replacement
- Removal: Open the cabinet flap and prop it up (or ask a second person to hold the front). Using the small slotted screwdriver, gently lever the spring clip on the ball joint of the old damper. The cylinder can now be pulled off the ball joint. Repeat this on the carcass side.
- Plate Inspection: Inspect the mounting plates screwed to the wood. If the ball joints are intact and have the same diameter as the new damper, the old plates can remain in the cabinet.
- Plate Replacement (if required): If the ball heads do not fit, unscrew the old plates. Use the existing System 32 holes to secure the new mounting plates with Euro screws or wood screws (usually 4 x 16 mm).
- Installation: Simply press the new damper onto the ball joints until the securing clip audibly engages. Always fit the cylinder with the thicker tube pointing upwards (towards the front) and the thin piston rod pointing downwards (towards the carcass). This ensures continuous lubrication of the internal seals.
Tip for kitchen upgrades: If you are carrying out work on the wall unit anyway, the space gained behind a properly functioning flap can be utilised efficiently. Retrofitting a dish drying rack for wall units directly above the sink is an effective storage solution that pairs excellently with upward-opening flaps.
Frequently Asked Questions (FAQ)
How do I calculate the required force in Newtons for my cabinet flap? If the rating on the old part is illegible, weigh the front (in kg) and measure the height of the flap (in mm). A general rule of thumb is: front weight (including handle) x flap height x 0.15 = approximate force in N. For a 4 kg door measuring 400 mm in height: 4 x 400 x 0.15 = 240 N. A 250 N damper would be the correct choice here.
Can I use an upward flap stay for a downward-opening flap? No. The mechanics are entirely opposite. A gas strut pushes outwards constantly (to keep the flap raised). On a downward-opening flap, it would make closing extremely difficult and cause the flap to drop down forcefully when opened. Always use a mechanical drop-down flap stay for this purpose.
Do I always have to install two stays per cabinet? On narrow cabinets (up to approx. 450 mm wide), a single stay on one side is often sufficient. From a cabinet width of 600 mm upwards, two stays (left and right) should always be used. Otherwise, the front can warp over time due to one-sided pressure, misaligning the door gaps.
Why does my flap not close softly despite a new stay? A gas flap stay does not decelerate the flap in the final millimetres. Smooth and quiet closing is handled by the damper integrated into the hinge (soft-close). If the flap bangs shut, either the hinge dampers are defective or standard concealed hinges without damping were fitted.