Fitting Inset Concealed Hinges — Step-by-Step Guide

August 8, 2026

A concealed hinge for an inset application features a prominent crank and enables the cabinet door to sit flush inside the carcase rather than resting on the side panels.

Fitting inset fronts in cabinet making requires a higher level of precision than conventional door types. Because the door is enclosed on all sides by the cabinet panels, an exact gap dimension must be calculated and maintained. The door inside the carcase behaves like a piston in a cylinder – without the precisely calculated clearance, the mechanism will bind immediately.

This guide is aimed at fitters and joiners. It covers correct measurement calculation, drilling the cup holes, and positioning the mounting plate for inset concealed hinges.

Technical Requirements and Difficulty Level

With an inset door (also referred to as an embedded application), the front sits flush with the front edges of the cabinet sides, base, and top panel. The concealed hinge used must have a high crank.

Difficulty level: High (requires exact calculation of setback dimensions).
Time required: approx. 15 to 20 minutes per front.
Measurement tolerance: +/- 0.5 mm during gap calculation.

Required Tools and Materials

For a professional installation, the following tools and hardware components must be ready:

Forstner drill bit: Ø 35 mm (standard dimension for most fittings).
Centring bit or bradawl: For the exact positioning of fixing screws.
Cordless screwdriver with torque control.
Try square, folding rule, and sharp pencil (hardness HB or H).
Chipboard screws: Ø 3.5 mm or 4 mm, length typically 16 mm (for 19 mm thick fronts).
Matching cross mounting plate (often with 0 mm spacing, depending on manufacturer specifications).
The high-crank hinge itself, for example from the 35 mm concealed hinges category.

Step 1: Calculating Dimensions and Door Gaps

Before using the drill, the gap (the clearance between the door and the inner carcase side) must be calculated. This gap is strictly necessary so that the door does not rub against the cabinet side when opening.

Calculate door width: Internal carcase width minus twice the desired gap. For an internal carcase width of 562 mm and a side gap of 2 mm on each side, this results in a door width of 558 mm.
Calculate door height: Internal carcase height minus twice the desired gap (top and bottom).
Determine gap dimension: As a rule, a gap of 1.5 mm to 2 mm is selected for standard fronts (16 mm to 19 mm thickness).

Step 2: Marking the Drilling Distances on the Door

The cup distance (the dimension from the door edge to the perimeter of the 35 mm hole) significantly determines the final gap reveal.

Place the door with the inside facing upwards on a clean, flat work surface.
Mark the vertical position of the hinges. A common dimension is 100 mm to 150 mm from the top and bottom edge of the door.
Mark the cup distance. On most systems, this value is between 3 mm and 5 mm.
The centre point for the Forstner bit is calculated from the cup distance plus half the cup diameter (17.5 mm). With a cup distance of 4 mm, the drilling centre is located exactly 21.5 mm from the door edge.

Step 3: Drilling the Hinge Cup Hole

The depth of the hole is crucial. If it is too shallow, the fitting will not sit flush; if it is too deep, the centring point of the drill bit will pierce the front.

Clamp the Forstner bit into the machine.
Drill strictly perpendicular to the door. A pillar drill or mobile drilling guide guarantees a 90-degree angle.
The standard drilling depth is 12 mm to 13 mm. Check the depth periodically by test-fitting the hinge.
Thoroughly vacuum away all wood shavings.

Step 4: Installing the Concealed Hinge into the Door

Insert the hinge into the 35 mm hole.
Align the hinge arm at an exact 90-degree angle to the door edge using the try square. A misaligned installation will lead to binding door mechanics later on.
Mark the fixing holes on the left and right sides of the cup.
Lightly punch the holes or pre-drill with a 2 mm bit to a maximum depth of 5 mm.
Fasten the fitting with the chipboard screws (e.g. 3.5 x 16 mm).

Tip for modern fronts: When fitting soft-close concealed hinges / cabinet hinges, make sure that the damping mechanism (if located in the cup) remains free of drilling dust.

Step 5: Calculating the Mounting Plate Position in the Carcase

This is where the biggest difference from overlay doors lies. In a conventional full overlay setup, the front row of screws for the mounting plate is positioned 37 mm from the front edge of the carcase as standard (according to System 32).

For inset fronts, the mounting plate moves further back into the carcase by the door thickness plus the front gap.

The calculation formula is: Distance = 37 mm + door thickness + front gap

Calculation example:

Standard dimension: 37 mm
Door thickness: 19 mm
Front gap (clearance so the door does not rub on the carcase): 1 mm
Total distance from the front edge: 57 mm.

Transfer the calculated setback dimension (e.g. 57 mm) to the inside of the carcase side panel.
Transfer the vertical height of the hinges from the door to the carcase. Take the bottom clearance of the door into account.
Pre-drill the holes for the cross mounting plate (with Euro screws Ø 5 mm, with standard screws Ø 2 mm).
Screw the mounting plate firmly into position.

Step 6: Hanging the Door and 3D Adjustment

Guide the hinge arms on the door towards the mounting plates in the carcase.
With modern clip-on hinges, engage the hinge by applying light pressure to the rear part of the hinge arm. An audible "click" confirms a secure connection.
Now carry out fine adjustment. An inset application forgives no inaccuracies, as uneven gaps are immediately noticeable.

The three dimensions of adjustment:

Depth adjustment: Loosening the rear screw on the hinge arm (or turning the eccentric screw) allows the door to move forwards or backwards. Adjust the front reveal here so that the door sits flush with the carcase front edge.
Lateral adjustment: The front screw on the hinge arm regulates the side position. Turning clockwise reduces the side gap on the hinge side, while turning anti-clockwise increases it.
Height adjustment: Loosen the fixing screws of the mounting plate slightly (or use the eccentric adjustment on the plate) to shift the door vertically by approx. +/- 2 mm.

Common Installation Mistakes

Even experienced installers occasionally make mistakes with this specific mounting type. Avoid the following scenarios:

Mixing Up Hinge Types

A classic error is choosing the wrong fitting. A hinge for full overlay is straight (uncranked). A hinge for half overlay (twin) is half-cranked. Only the high-crank hinge is suitable for inset fronts. Anyone who selects the wrong component here will not be able to fit the door inside the carcase. For comparison between types, review information on full overlay concealed hinges and half overlay concealed hinges.

Overlooking Hardware Clashes

With inset doors, the hinges project deeper into the usable interior space of the cabinet than with overlay doors. If internal drawers or pull-outs are planned, they often clash with the hinge arm. In this case, spacer strips must be fitted behind the drawer runners to allow the full-extension runners to clear the hinges.

Insufficient Cup Distance

If the 35 mm hole is placed too close to the edge (e.g. 2 mm), the material strength of the chipboard is often insufficient to withstand the forces when opening. The edge may break out. Strictly follow the manufacturer charts, which usually specify a distance of 4 mm or 5 mm.

FAQ – Frequently Asked Technical Questions

Can I use a hinge with a 110° opening angle for an inset door? Yes. The opening angle is independent of the mounting type. Fittings from the 110-degree concealed hinges / cabinet hinges range are standard for this application. Simply ensure that a high crank is specified in the technical details.

Why is the inset door not closing completely? This is usually due to an incorrectly calculated depth for the mounting plate. If the plate sits too far forward in the carcase, the hinge kinematics reach their physical limit before the door is flush. Check the formula: 37 mm + door thickness + gap. Readjust via the depth adjustment screw.

How many hinges do I need per door? This depends on the weight and height of the front. Up to 900 mm height and 7 kg weight, 2 hinges are sufficient. Up to 1600 mm and 14 kg, fit 3 hinges. From 2000 mm height and 20 kg weight upwards, 4 to 5 hinges are strictly required to prevent sagging.

What is the difference between "inset" and "embedded" doors? There is none. The terms inset, embedded, and internal mount are used synonymously in hardware engineering. You will generally find these components gathered in categories such as inset concealed cabinet hinges or in the main category for concealed hinges / cabinet hinges.