Inset Doors (Inset Application): Which Concealed Hinge and Mounting Plate to Choose?

A concealed hinge for inset doors has a large crank and ensures that the cabinet door sits flush between the carcass side panels rather than resting on top of them.

In furniture construction, the application type defines how the door sits in relation to the carcass. While with a full overlay the door conceals the side panel, with an inset application it sits flush with the front edge of the side panel. This flush appearance requires specific hinge geometry and a precisely matched mounting plate. For joiners and fitters, this means dimensions, gaps, and plate heights must be calculated precisely so that the door does not scrape against the side panel when opened.

This guide explains the technical specifications for inset doors and helps you select the exact fittings for your furniture projects.

Key Buying Criteria for Inset Concealed Hinges

Choosing the correct hinge for an inset application depends on fixed mechanical and geometric values. Incorrect measurements will inevitably lead to component collisions.

1. The Crank of the Hinge Arm

The most visually distinct feature of an inset application hinge is its deeply curved hinge arm. This prominent crank (usually 15 mm - 18 mm) allows the door to pivot out of the carcass when opening without catching on the front edge of the side panel. A straight hinge arm would instantly press the door against the inside of the cabinet.

2. Cup Diameter and Drilling Depth

The standard drill diameter for furniture doors is 35 mm. For very narrow frame profiles or thin doors, versions with 26 mm are available. The typical drilling depth for the hinge cup is 11.5 mm - 13.0 mm. The door thickness must therefore be at least 15 mm - 16 mm to prevent the drill hole from breaking through the front face. For standard furniture construction, concealed hinges 35 mm are the standard configuration.

3. The Opening Angle

For inset doors, an angle of 110° is used as standard. This is fully sufficient for normal access to cabinet contents. If the door cannot swing wide due to room constraints, concealed hinges / cabinet hinges 90 degrees are used. For angles exceeding 110°, kinematics for inset doors become extremely complex, as the door must swing far out in front of the carcass to prevent collisions.

4. The Reveal (Gap Size)

For inset doors, an all-round gap is strictly necessary. Without this clearance between the door and the interior carcass wall, the door cannot move. The recommended minimum dimension for the reveal is 1.5 mm - 2.0 mm. For thicker fronts (from 22 mm), the gap on the hinge side must often be larger, as the door edge describes a wider arc during opening.

Calculating the Correct Mounting Plate

The concealed hinge alone is not enough; the mounting plate (often designed as a cruciform mounting plate) connects the hinge to the carcass side wall. Its thickness is specified as the distance (D) in millimetres.

For overlay doors, distances of 0 mm or 3 mm are commonly used. For concealed hinges for inset doors, the calculation basis changes drastically. Here, the side panel acts as a boundary, and the mounting plate must project further into the interior space.

The required plate distance depends on the door thickness and the desired reveal. As a rule of thumb for standard hinges: the thicker the door, the higher the mounting plate distance must be. Many manufacturers provide charts showing the distance (e.g. 8.5 mm or 18 mm) depending on the desired reveal and fixing dimension.

Types and Options at a Glance

The internal mechanics of the hinge determine the operating convenience of the furniture. Clear technical decisions must be made here, as certain systems are mutually exclusive.

Hinges with Soft-Close

An integrated damper slows down the door over the final centimetres of its closing movement and pulls it shut silently. The damping unit is either integrated invisibly within the hinge cup or clipped onto the hinge arm. Concealed hinges / cabinet hinges with damping (Soft Close) require an integrated closing spring.

Hinges for Push-to-Open (Tip-On)

Handleless fronts require a completely different mechanism. Here, a mechanical touch latch is installed in the carcass. Important: for this application, the hinge must be unsprung (without self-closing action) or feature a reverse spring. A soft-close hinge must never be fitted here, as its closing spring would work against the push-latch release mechanism.

Clip-on vs Slide-on Technology

With clip-on assembly, the hinge is pressed onto the mounting plate without tools and clicks into place audibly. This saves considerable time during final fitting. Older or basic systems use slide-on technology, where the hinge slides onto the plate and is secured with a fixing screw.

Which Concealed Hinge for Which Scenario?

The choice of the exact concealed hinges inset application model depends on the specific installation requirements.

• For standard furniture (18 mm chipboard): Choose a high-crank hinge for inset application with a 110° opening angle and clip-on mounting. A mounting plate with a matching distance (often 8.5 mm or 9 mm, depending on the manufacturer) ensures the correct reveal.
• For handleless designer furniture: Use a high-crank unsprung hinge combined with a push-to-open unit.
• For heavy MDF fronts: Opt for a version with integrated soft-close damping. For doors over 600 mm wide or 15 kg in weight, at least three hinges per door should be planned to prevent sagging.
• For general interior joinery: If you need versatile solutions, the concealed hinges / cabinet hinges category offers an overview of all standard variants.

Installation Tips for the Fitter

Installing inset doors requires precise marking out. The cup drill bit must be positioned at an exact angle, just like a surgeon's scalpel, to avoid tearing the melamine coating on chipboard.

Required tools:

• Cordless screwdriver
• Forstner drill bit (35 mm)
• Centring drill bit
• Pozi screwdriver (PZ2)
• Folding rule and set square

Step-by-step procedure:

1. Mark the drilling centre: The distance from the door edge to the centre of the cup hole (the cup drilling distance) is usually 4 mm - 5 mm.
2. Drill the cup: Using the Forstner bit, drill to a depth of exactly 12 mm - 13 mm.
3. Attach the hinge: Insert the concealed hinge and align it squarely. Fix it in place with chipboard screws (3.5 x 16 mm) or pre-mounted Euro screws.
4. Position the mounting plate: Mark the location on the inside of the carcass. In System 32, the front row of drill holes is situated exactly 37 mm from the front inner edge of the carcass plus the thickness of the inset door. Example: For a 19 mm thick door, the drilling line is at 56 mm (37 + 19).
5. Hang and adjust the door: Clip the door into place. Perform 3D adjustment using the eccentric screws on the hinge arm. The side adjustment regulates the lateral gap, the depth adjustment aligns the door flush with the front carcass edge, and the height adjustment levels the gaps at the top and bottom.

FAQ – Frequently Asked Questions about Inset Door Hinges

How can I identify a concealed hinge for an inset application? The definitive feature is the hinge arm. It has a pronounced bend (high crank). Overlay doors have a straight arm, while half-overlay doors feature a slightly cranked arm.

Can I use a standard hinge for an inset door? No. A straight hinge (for full overlay) will instantly force the door against the carcass side panel when opening. The door will fail to open and the fittings or timber may tear out.

How large must the gap (reveal) be on an inset door? Plan for an all-round gap of at least 1.5 mm - 2.0 mm. This clearance is technically necessary so that the timber edges do not rub against each other when the door pivots open.

Why is my handleless inset door not closing properly? If a push-to-open latch is fitted, the hinge must not feature a closing spring (soft-close). The spring continuously pulls the door shut, preventing the catch from activating or pushing the door open. You require an unsprung hinge.

How deep do I need to drill for the hinge cup? The standard depth for 35 mm furniture hinges is 11.5 mm - 13.0 mm. Measure the depth of the metal cup accurately before drilling to avoid penetrating through the front face.

Which hinge do I need for opening angles over 110°? For an inset application, opening angles beyond 110° (such as concealed hinges / cabinet hinges 110 degrees) are extremely rare and demand specialised hinges, because the kinematics require the door to swing far clear of the carcass. Standard furniture making almost exclusively relies on angles up to 110°.