Flap Stays for Drinks Cabinets (Downward-Opening Flaps): Selection and Installation

A flap stay for downward-opening flaps controls the drop speed of the furniture front and locks it precisely at 90° when fully opened. In contrast to lift-up flap fittings for wall units, which push a front upward against gravity, fittings for a drinks cabinet or bureau must brake the flap's own weight and relieve the hinges at the end stop. Selecting the correct fitting technology prevents concealed hinges from tearing out and protects cabinet edges from mechanical damage.

This guide defines the technical parameters for sizing and installing brake flap stays and damping systems for downward-opening furniture fronts.

Key Purchasing Criteria for Flap Fittings

Specifying the right fitting requires exact data on the geometry and weight of the front. In practice, guessing invariably results in insufficient braking action or stiff, awkward operation.

Load Capacity and Flap Weight

For gas-pressurised systems, holding force is specified in Newtons (N). To determine the required force, the weight of the flap must be calculated. A standard front made of chipboard (19 mm thickness) weighs approximately 13 kg per square metre. For fronts made of MDF, the value is around 15 kg/m², while solid wood can vary substantially depending on density. Additionally, the weight of fitted handles (often 0.1 kg to 0.3 kg) must be added. Fitting manufacturers provide tables comparing flap weight against flap height.

Flap Height and Leverage

The height of the flap (the dimension from the hinge axis to the top edge) defines the lever arm. A 600 mm high front exerts a significantly higher torque on the flap stay than a 300 mm high front of the same weight. From a front height of 400 mm or a width over 600 mm, the use of two synchronised stays (left and right) is strictly necessary to prevent the front from warping.

Fixing System and Hole Spacing

In professional furniture construction, installation often follows the System 32 standard. This means the mounting plates of the flap stay are aligned with standard 32 mm hole patterns using a 5 mm drill hole diameter. Euro screws are used here. For plain interior panels without pre-drilled holes, fixing is done directly into the material using chipboard screws (usually 3.5 mm or 4 mm diameter).

Overview of Flap Stay Types

The internal mechanism of the fitting determines the opening behaviour and the space required inside the cabinet.

Mechanical Brake Flap Stays (Scissor Fittings)

These classic flap fittings operate using friction resistance. An adjusting screw on the joint defines how strongly the downward movement is braked. They are robust, but their scissor mechanism requires a certain amount of swing clearance inside the cabinet.

Cable-Stay Flap Mechanisms

A compact and modern solution. The mechanism sits in a small housing on the cabinet interior wall, while the front is held by a thin steel cable. The braking force and the exact opening angle can be finely adjusted. These systems are extremely space-saving and hardly interfere with using the drinks cabinet interior.

Gas Struts and Hydraulic Dampers

Whilst a classic gas strut pushes a front upwards, systems for downward-opening flaps function as tension springs or pure hydraulic brakes. They allow the flap to lower gently (soft-close effect). For particularly heavy fronts, there are dedicated gas struts for heavy flaps that handle larger loads thanks to a larger cylinder diameter.

Which Fitting for Which Application? (Decision Guide)

The choice of hardware depends on the unit, the material, and aesthetic requirements.

• If you are fitting a small, lightweight drinks cabinet (e.g. 400 mm x 300 mm) made from melamine-faced chipboard, then a single mechanical brake flap stay on one side is sufficient.
• If you are installing a wide TV lowboard flap (e.g. 1200 mm width), then you must use two robust cable stays or two hydraulic dampers to prevent sagging in the middle.
• If the front is made of heavy solid wood and needs to serve as a work surface when open, then choose heavy-duty gas struts with a Newton rating matched to the weight (e.g. 250 N or higher, according to the manufacturer matrix).
• If the interior of the unit has a dark finish (e.g. anthracite decor or oak with black accents), then colour-matched components like a black gas strut integrate more discreetly than standard zinc-plated hardware. For light cabinets, a silver gas strut is correspondingly suitable.

Installation and Fitting of Flap Stays

Precise positioning of the mounting points is essential for proper function. Deviations of just a few millimetres will prevent the flap from stopping at an exact 90° angle or cause tension when closed.

Required Tools:

• Tape measure or folding rule
• Bradawl (marking awl)
• Cordless drill/driver
• Pozi screwdriver (size PZ2 for standard chipboard screws)
• Angle finder (optional, to check the 90° angle)

Step-by-Step Instructions:

1. Fit the hinges: First, attach the front to the cabinet using suitable hinges. For drinks cabinets, use specialised flap hinges (which sit flush with the base) or standard concealed hinges (usually 35 mm cup diameter) without integrated soft-close.
2. Transfer the measurements: Refer to the technical data sheet for the cabinet dimension (distance from the front edge inward) and the front dimension (distance from the hinge axis upward). Mark these points using the bradawl.
3. Attach the cabinet mounting: Screw the housing or mounting plate of the stay onto the cabinet interior wall. Ensure it is aligned vertically.
4. Attach the front mounting: Mount the bracket to the inside of the flap.
5. Connect and adjust: Hook the stay arm or cable into place. Open the flap carefully. Adjusting the braking force works like adjusting a bicycle brake: half a turn of the adjustment screw noticeably alters the deceleration. Set the mechanism so that the flap glides smoothly into the 90° position.

Frequently Asked Questions (FAQ)

How do I calculate the required force in Newtons (N) for my flap? The exact force depends on the interaction between weight and front height. As a rough rule of thumb, 10 Newtons corresponds to approximately 1 kg of holding force. However, the lever arm (height of the flap) changes this value significantly. Always consult the manufacturer's specific chart, cross-referencing height (in mm) on the X-axis and weight (in kg) on the Y-axis.

Can I use a standard gas strut for a drinks cabinet? No. A standard gas strut (compression spring) pushes the rod outward automatically and would continuously try to push a downward-opening flap closed. For drinks cabinets, you require mechanical brake flap stays, cable systems, or specialised tension struts that brake the downward drop.

How many flap stays do I need per front? For front widths up to 400 mm, a single fitting (mounted on one side) is generally sufficient. From a width of 400 mm to 600 mm, or with particularly heavy materials, fitting two stays (left and right) is mandatory. This ensures an even load distribution and protects the hinges from uneven wear.

Which hinges should I combine with the flap stay? Use concealed hinges with an opening angle of 90° or 110°. Crucially, these hinges should ideally have no self-closing spring and no integrated soft-close damping. All movement control and braking should be handled entirely by the flap stay, as two competing damping systems can block smooth operation.

Why does my flap no longer close completely flush? If the front stands proud when closed, the mounting points (cabinet or front dimensions) were not drilled exactly to the manufacturer's specification. A discrepancy of just 2 mm to 3 mm will cause the stay mechanism to bottom out before the hinges are fully closed. In this case, reposition the front mounting bracket in accordance with the installation guide.