Fitting Furniture Hinges for IKEA Besta: Installing 35 mm Concealed Cup Hinges Accurately

A concealed cup hinge with a 35 mm cup diameter is the standard fitting for cabinet doors, secured inside the cabinet carcass via a cruciform mounting plate and allowing three-dimensional adjustment of the front.

Retrofitting or replacing hinges on standard carcass systems such as the IKEA Besta requires precise workmanship and an understanding of the mechanical tolerances of furniture fittings. The Besta system relies on standard industrial dimensions, making the use of third-party fittings straightforward. This guide is aimed at installers and experienced DIYers who want to fit cabinet hinges professionally, align gaps with millimetre precision, and coordinate door movement perfectly with the carcass.

The pure installation time per door front takes approximately 10 to 15 minutes when drilling holes are already prepared. Subsequent adjustment requires an additional 5 minutes.

Required Tools and Materials

Installing concealed cup hinges in cabinet making requires specific tools to ensure fittings are mounted flush and free from distortion.

• Cordless screwdriver (with precisely adjustable torque limiting)
• Screwdriver or bit with PZ (Pozidriv) size 2 drive (PZ2). Note: Using a PH (Phillips) bit on chipboard screws will cause the screw head to strip.
• Folding rule or digital calliper
• Try square (for 90° alignment of the hinge arm)
• Concealed hinges 35 mm including suitable cruciform mounting plates
• Chipboard screws (countersunk, 3.5 x 16 mm) for fixing the cup, unless using a tool-free expanding dowel system
• Euro screws (6.3 x 13 mm) for the mounting plate in System 32

Step-by-Step Guide: Inserting and Mounting the Cup Hinge into the Front

The following guide describes fitting a standard hinge onto a pre-drilled cabinet door for an individual unit.

Step 1: Check Components, Dimensions and Overlay Type

Before fastening any hardware, ensure that the overlay type matches the carcass construction. On a freestanding Besta unit where the door completely covers the side panel from the front, a full overlay is required. The corresponding hinge has a straight hinge arm (0 mm cranking). Suitable full overlay concealed hinges ensure that the front sits flush with the outer edge of the side panel when closed.

Door fronts feature factory-drilled blind holes with a 35 mm diameter and a typical depth of 12.5 mm. The cup distance dimension (C-dimension) — the distance from the edge of the drilled hole to the edge of the door — is usually 4 mm to 5 mm in these systems.

Step 2: Secure the Cruciform Mounting Plate in the Carcass

The Besta carcass features a continuous row of holes in the side panels. This hole pattern conforms to the industrial System 32 standard. This means: the distance from hole centre to hole centre is exactly 32 mm, and the distance from the front carcass edge to the centre of the first row of holes is 37 mm. The hole diameter in the carcass is 5 mm.

The cruciform mounting plate is secured in this row of holes using two Euro screws. The arrow marking on the mounting plate must point towards the front carcass edge. Tighten the screws hand-tight. Excessive torque on a cordless screwdriver can strip the thread in the chipboard.

Step 3: Insert the Hinge Cup into the Door Front

Place the cabinet door with the inner side facing upwards on a clean, flat work surface. Insert the metal hinge cup into the 35 mm drilled hole. The cup must sit completely flat against the bottom of the recess.

Now align the hinge arm at an exact 90° angle to the door edge. Use a try square for this step. Mounting the hinge crooked will lead to severe mechanical tension when opening and closing the door. Fasten the hinge cup through the side fixing flanges using two chipboard screws (3.5 x 16 mm, PZ2 drive).

Step 4: Clip the Door onto the Carcass (Clip-on Installation)

Bring the door up to the cabinet carcass. On modern fittings, the connection between hinge arm and mounting plate is tool-free. Hook the front of the hinge arm into the front slot of the cruciform mounting plate. Then press the rear part of the hinge arm against the plate. The clip-on mounting locks the hinge audibly onto the plate, engaging with precision. Pull lightly to verify that both hinges (top and bottom) are securely clicked into place.

Step 5: Three-Dimensional Adjustment (Aligning Gaps)

Once clipped on, the door rarely hangs perfectly straight right away. The cruciform mounting plate and the hinge arm provide three adjustment screws to set the reveals.

1. Height adjustment (Y-axis): Loosen the mounting plate fixing screws in the carcass slightly. The elongated slots in the plate allow vertical movement of the door by approximately +/- 2 mm. Align the door flush with the top and bottom edges of the carcass and retighten the screws.
2. Depth adjustment (Z-axis): This setting regulates the gap between the inside of the door and the front carcass edge. The rear screw on the hinge arm (often an eccentric cam screw) enables this adjustment. The optimal gap is 1.5 mm to 2.0 mm. If the gap is too small, the door will rub against the front edge of the cabinet when opening.
3. Side adjustment / lateral reveal (X-axis): The front screw on the hinge arm regulates door overlay. Turning clockwise moves the door edge towards the outside of the carcass. Turning anti-clockwise widens the gap to the adjacent door or wall. Adjust for an even, parallel gap along the entire height of the door.

Common Mistakes During Selection and Installation

Even with standardised systems, technical errors can occur that hinder the function of the cabinet door.

• Incorrect overlay type selected: If two doors are mounted on a single central partition wall, a full overlay cannot be used. In this case, a half overlay (dual application, 9.5 mm cranking) is strictly required, as the two doors would otherwise obstruct each other. Helpful fittings for such layouts include half overlay concealed hinges. If the door sits completely inside the carcass frame (leaving the front edges of the side panels visible), an inset hinge (18 mm cranking) is required. See inset concealed hinges.
• Incorrect screw drive: Attempting to drive chipboard screws with a PH bit causes cam-out. The bit slips, damages the screw head, and prevents the hinge from being disassembled later. Use PZ bits exclusively.
• Mixing soft-close and push-to-open mechanisms: A soft-close mechanism cushions the closing movement using an integrated hydraulic cylinder. A push-to-open system (tip-on), by contrast, pushes the door open via spring force. These systems operate in opposite directions of force and must never be combined on the same door. If planning handleless fronts, you will require unsprung or standard un-damped hinges.

Frequently Asked Questions (FAQ)

What opening angle is ideal for standard cabinet doors?

For standard cupboards and sideboards, an opening angle of 110° is the technical benchmark. It allows convenient access without the door projecting too far into the room. Suitable hardware can be found under concealed hinges / cabinet hinges 110 degrees. For units with internal pull-out drawers (English drawers), wide-angle hinges are needed to swing the door completely clear of the drawer path. In these cases, concealed hinges / cabinet hinges 165 degrees are used.

Can I retrofit existing hinges with soft-close damping?

Yes, replacing standard hinges with concealed hinges / cabinet hinges with soft-close damping is straightforward, provided the cup diameter (35 mm) and overlay type remain identical. On modern fittings, the hydraulic damper is invisibly integrated inside the hinge arm. You simply unclip the old hinges and clip in the new ones.

Why is the door not closing flush even though the screws are tight?

This is usually caused by incorrect depth adjustment. If the door is set too close to the carcass on the hinge side (gap less than 1.0 mm), it pivots against the carcass edge, which levers the opposite handle side slightly open. Loosen the rear eccentric screw on the hinge arm, move the door 1.5 mm forward, and secure the setting again.

How do I release a clip-on hinge from the carcass?

At the rear end of the hinge arm (pointing towards the interior of the cabinet) is a small, often grooved release lever. Press this lever towards the back panel or pull it slightly (depending on the fitting). The hinge will unlatch audibly from the rear retention clip of the mounting plate and can be lifted off diagonally forwards.

Related Hardware Components for Cabinet Making

When extending or modifying a carcass, other components require similar technical installation standards. For a complete overview of all hinge types, explore the main category for concealed hinges / cabinet hinges.

If you are planning horizontal flap doors rather than standard hinged doors, the hardware requirements change fundamentally. Traditional concealed hinges are not used here; instead, flap stays and gas struts support the weight of the front. The force of these cylinders is specified in Newtons (N) and must match the door weight precisely. Matching components for heavy MDF or solid timber fronts can be found under gas struts for heavy flaps.