35 mm Cup Concealed Hinges: The Ideal Alternative to Blum Hinges
A concealed hinge with a 35 mm cup diameter is the furniture industry standard and offers a precise, technical alternative to systems such as Blum hinges.
Sagging cabinet doors, rubbing edges, or a faulty closing mechanism are typical signs that a hinge has reached the end of its service life. When a door slams shut loudly or no longer sits flush against the carcass, the issue usually lies within the mechanical fitting. In these instances, the diagnosis is clear: the integrated spring is worn out or the damper cylinder has lost its function.
Replacing defective branded fittings does not strictly require the exact same manufacturer. Because the furniture industry is heavily standardised, faulty hardware can easily be replaced with alternative concealed hinges / cabinet hinges, provided that fundamental technical specifications such as cup diameter and door overlay match. This guide outlines the technical requirements and takes you step by step through a professional replacement.
Causes of Faulty Cabinet Hinges
A concealed hinge is a heavy-duty mechanical component. When it fails, it is usually due to physical factors:
- Mechanical wear: Much like a vehicle shock absorber, the cylinder cartridge of a soft-close hinge loses pressure after tens of thousands of cycles. Consequently, the door slams unchecked against the carcass.
- Incorrect weight distribution: Heavy frontals made of MDF or solid wood require an adequate number of hinges. If a door exceeds 900 mm in height and is supported by only two hinges, excessive leverage bends the hinge pivot pins.
- Incorrect gap adjustment: If hinges are placed under extreme tension via their adjustment screws because the cabinet is not level, the cruciform mounting plate will eventually tear out of the carcass chipboard.
Which Replacement Part Is Correct?
To replace an existing hinge with an alternative, three technical parameters must be determined. If these match, compatibility is guaranteed.
1. Cup Diameter
The standard for cabinet doors is a 35 mm cup hole. Measure the diameter of the circular recess drilled into the door. Concealed hinges 35 mm fit almost all modern kitchen and wardrobe doors. Less common sizes, such as 26 mm, are typically found only in very light or narrow bathroom cabinets.
2. Door Overlay (Cranking)
The position of the door relative to the cabinet carcass when closed determines the cranking of the hinge arm. Ensure these are not confused:
- Full overlay: The door completely covers the carcass side panel (overlay door). The hinge arm is straight. Suitable replacements are found under full overlay concealed hinges.
- Half overlay: Two doors share a central partition wall inside the cabinet (dual overlay door). The hinge arm is slightly cranked. These require half overlay concealed hinges.
- Inset: The door sits flush inside the carcass sides (inset door). The hinge arm is deeply cranked. The correct choice is inset concealed hinges.
3. Opening Angle and Damping
The standard opening angle for standard cabinet doors is usually 110°. Alternative hinges, such as 110 degree concealed / cabinet hinges, cover this requirement perfectly. Special corner cabinets or units with internal drawers require wide-angle hinges, such as 165 degree concealed / cabinet hinges.
Whether the new hinge should feature integrated damping is a matter of convenience. Concealed / cabinet hinges with damping (soft close) cushion the door just before it shuts, pulling it quietly closed.
Step-by-Step Solution: Replacing Hinges Professionally
The replacement can be carried out using basic tools. Work precisely during removal and installation to avoid damaging existing drill holes.
Required Tools
- Cordless screwdriver or manual screwdriver with a PZ2 bit (Pozidriv)
- Folding rule or callipers
- New chipboard screws if required (e.g. 3.5 x 16 mm)
- Wood filler (if existing screw holes are stripped)
Step 1: Removing the Old Hinges
Release the hinges from the carcass. Modern hinges feature clip-on technology: press the release lever at the rear end of the hinge arm to unclip the hinge from the mounting plate. Remove the door. Next, unscrew the mounting plates from the carcass side and the hinge cups from the door.
Step 2: Checking Measurements and Preparation
Check whether the drilling pattern of the new hinge matches the old holes. The centre-to-centre distance of the screw holes next to the 35 mm cup is typically 45 mm, 48 mm, or 52 mm across different manufacturers. If the old holes in the chipboard are stripped, fill them with wood filler and allow it to cure before inserting new screws.
Step 3: Fitting the Cruciform Mounting Plate
Screw the new mounting plates onto the inside wall of the carcass. Most furniture uses System 32, where the rows of holes are spaced 32 mm apart and positioned 37 mm from the front edge. Use suitable Euro screws (for 5 mm holes) or wood screws for smaller pilot holes.
Step 4: Inserting the Hinge Cups
Place the new concealed hinges into the 35 mm drill holes on the door. Align the hinges at an exact 90-degree angle to the door edge using a square. Fasten the cups with the appropriate screws.
Step 5: Hanging the Door and Adjusting the Gaps
Clip the hinge arms onto the mounting plates inside the carcass (for clip-on hinges) or slide them on and tighten the fixing screw. Now carry out the 3D adjustment using the screws on the hinge arm:
- Depth adjustment: Sets the gap between the door and the carcass.
- Height adjustment: Regulated via the mounting plate to move the door up or down.
- Lateral adjustment: Moves the door left or right to achieve parallel reveals with adjacent frontals.
Prevention: Making Fittings Last Longer
To maximise the service life of new hinges, observe a few fundamental technical rules. Ensure the door gaps are correctly set. A hinge under constant strain caused by a door rubbing against the carcass will wear out significantly faster.
Furthermore, the number of hinges is crucial. As a rule of thumb: up to a door height of 900 mm, two hinges are sufficient. From 900 mm, fit three hinges; from 1600 mm, four hinges; and from 2000 mm, five hinges. Setting the damping correctly—many modern soft-close hinges allow damping to be switched on or off via a switch on the hinge cup—ensures light doors do not close too slowly and heavy doors do not close too quickly.
Frequently Asked Questions (FAQ)
Can I mix hinges from different manufacturers on the same door? No. Even if the cup diameter is identical at 35 mm, hinges from different manufacturers (or even different product lines from the same brand) have varying kinematics during opening and closing. Mixing causes strain and rapid failure. Always replace all hinges on a door at the same time.
What is the difference between soft-close and push-to-open? These are opposite mechanisms. Soft-close is a damper that decelerates the door as it shuts. Push-to-open (tip-on) is a spring-loaded automatic mechanism for handleless fronts that pushes the door open upon pressure. A hinge with damping cannot be combined with a push-to-open system, as the damper would block the push-open impulse. For handleless doors, hinges without a closing spring are required.
Do I have to replace the mounting plate as well? Yes. The geometry of the hinge arm and the clip mechanism are matched precisely to the corresponding mounting plate. The mounting plate of a Blum hinge is not compatible with the hinge arm of another brand, even if the hole centres in the carcass are identical.
How do I measure the opening angle of my old hinge? Open the door up to its mechanical stop. If the door stands at a right angle to the carcass, it is a 90° hinge. If it opens slightly wider, it is the standard 110° angle. If the door folds back almost parallel to the adjoining cabinet side, it is a wide-angle hinge (155° or 165°).