Fitting a Bathroom Mirror Cabinet Hinge: Securely Installing a Rust-Resistant 35 mm Cup Replacement for Pelipal

April 18, 2026

A mirror cabinet hinge in the bathroom requires robust corrosion protection due to high humidity levels, with a 35 mm cup diameter concealed hinge and an exact matching overlay type typically selected as a replacement for standard brands like Pelipal.

Bathroom furniture is exposed to demanding climatic conditions. Water vapour, condensation, and fluctuating temperatures take a heavy toll on metal hardware over the years. When the mirror cabinet door sags, drags, or the hinge has rusted severely, a replacement is due. For tradespeople or experienced DIYers, swapping a defective hinge on a Pelipal mirror cabinet or comparable unit is a standardised procedure.

This guide provides a precise walkthrough for identifying, removing, and installing replacement fittings. The focus is on exact dimensions, correct door overlay types, and subsequent gap adjustment. Pure installation time per door is roughly 15 to 20 minutes when materials are prepared.

Required Tools and Materials

Replacing a hinge is like precision surgery on your unit – the correct equipment determines accuracy of fit and long-term durability. Have the following tools and components ready:

Replacement hinges: Matching concealed hinges / cabinet hinges (nickel-plated, suitable for damp rooms).
Vernier calliper: For accurately determining the cup diameter (generally 35 mm) and the drilling pattern.
Cordless drill or hand screwdriver: Essential to use a PZ2 bit (Pozidriv). A PH bit (Phillips) will slip on standard furniture screws and strip the screw head.
Chipboard screws: In case the old screws are rusted. Typical dimensions: 3.5 x 15 mm, countersunk.
Wood drill bit (5 mm): Only required if the mounting plate holes in the carcass are stripped and need to be re-drilled.
Forstner bit (35 mm): Only necessary when building a completely new door without pre-drilled holes.

Step 1: Removal and Analysis of the Old Component

Before fitting the new hinge, the existing part must be analysed thoroughly. Bathroom cabinets usually use standardised hardware, yet critical technical distinctions exist.

First, detach the door from the cabinet carcass. On modern clip-on hinges, a simple press on the release lever at the rear end of the hinge arm will suffice. On older models, loosen the fixing screw on the cruciform mounting plate. Place the mirrored door flat on a soft surface (such as a blanket) to prevent glass breakage.

Now unscrew the old concealed hinge cup from the door. Inspect the hinge arm. If it is straight, you have a full overlay (the door fully covers the cabinet side edge). If the arm has a slight crank (bend), it is a half overlay (two doors share a single dividing panel). If there is a pronounced crank, it is an inset door (the door sits flush inside the cabinet carcass). Make sure to order the exact identical configuration, such as concealed hinges full overlay for standard outer doors.

Step 2: Measuring Cup Hole and Drilling Pattern

Use the vernier calliper to verify the dimensions of the hole in the mirror door.

Cup diameter: Standard for Pelipal and almost all European manufacturers is concealed hinges 35 mm. Occasionally, 26 mm is used for very slim decorative units.
Cup depth: Measure the depth of the hole. It should be at least 11.5 mm to 12 mm to ensure the hinge cup sits flush. Take care with mirrored doors: the remaining material thickness between the bottom of the cup hole and the mirror glass is extremely thin.
Drilling pattern (hole spacing): Measure the distance between the two small fixing screws next to the cup (centre to centre). Common dimensions are 45 mm, 48 mm, or 52 mm. The replacement hinge must match this drilling pattern, as drilling new holes so close to the old ones often causes tear-out.

Step 3: Fitting the Cruciform Mounting Plate to the Carcass

Remove the old mounting plate inside the cabinet. These are frequently attached using pre-inserted Euro screws in the System 32 grid (32 mm row spacing, 5 mm hole diameter).

Position the new cruciform mounting plate. Ensure the correct plate distance (D value). For standard carcass thicknesses of 16 mm or 19 mm, a mounting plate with a 0 mm distance is typically used. Tighten the screws hand-tight using the PZ2 screwdriver. When working with MDF or chipboard, avoid using a cordless drill on maximum torque, as this will immediately strip the thread in the wood.

Step 4: Inserting and Screwing the Concealed Hinge Cup

Take the mirror door and insert the cup of the new hinge into the 35 mm hole.

Align the hinge at a right angle (90°) to the door edge. A hinge mounted out of alignment will cause the door to bind later. Once the drilling pattern of the new hinge matches the existing screw holes perfectly, drive in the 3.5 x 15 mm countersunk screws.

Tip for stripped screw holes: If the old screw holes in the door no longer provide adequate grip, fill them beforehand with a small wooden dowel and wood glue, let it cure, and pre-drill with a 2 mm drill bit.

If you wish to modernise the mirror cabinet during this repair, this is the ideal time to install concealed hinges with soft close. The integrated damper in the hinge cup prevents the heavy mirrored door from slamming shut, simultaneously protecting the delicate mirror glass.

Step 5: Hanging the Door and 3D Adjustment

Offer the mirror door up to the cabinet carcass. With modern clip-on hinges, hook the front of the hinge arm onto the cruciform mounting plate first, then press the back down until it audibly clicks into place. Always engage the top hinge first, followed by the bottom hinge.

Now comes the most critical task: adjusting the gap reveal. A properly aligned door closes flush, does not rub against the cabinet, and maintains parallel gaps. Adjustment is carried out using three screws on the hinge arm:

Depth adjustment (gap clearance to carcass): Usually the rearmost screw on the hinge arm (or an eccentric cam). Turning it moves the door closer to or further from the carcass. Aim for a clearance gap of roughly 1.5 mm to 2.0 mm. If the door is set too close, it will rub against the cabinet side upon opening.
Side/overlay adjustment (gap width between doors): The front screw on the hinge arm. Turning it clockwise shifts the door edge outwards towards the carcass side. Turning it anti-clockwise shifts the door towards the centre. Adjust all hinges until the door hangs perfectly vertical.
Height adjustment: Slightly loosen the fixing screws on the cruciform mounting plate (or use the plate's eccentric cam screw, if present). Slide the door together with the hinges up or down until it sits completely flush with the top and bottom edges of the cabinet. Then tighten securely.

Common Mistakes During Hinge Installation

Even seasoned fitters occasionally encounter difficulties during cabinet assembly. Avoid these typical pitfalls:

Selecting the wrong overlay type: If a concealed hinges half overlay is installed on a door requiring a full overlay, the door will project past the side of the carcass when closed and cannot be aligned properly.
Incorrect opening angle: A standard bathroom cabinet typically requires hinges with a 95° or 110° opening angle. If concealed hinges / cabinet hinges 165 degrees are accidentally fitted, the door might hit adjacent walls or tiles when opened. For standard doors, choose concealed hinges / cabinet hinges 110 degrees.
Using excessive force when clipping on: If the clip mechanism does not snap shut easily, the hinge arm is likely not seated properly in the front guide of the mounting plate. Forcing it will bend the base plate.
Mixing up damping systems: A soft-close hinge pulls the door gently shut over the final few centimetres. This should never be paired with a push-to-open (tip-on) mechanism, as these systems work against each other.

FAQ – Frequently Asked Questions

Can I clean a rusted hinge instead of replacing it? Light surface flash rust can be rubbed off using fine steel wool. However, once rust has penetrated the hinge pivot pins, the component loses its load capacity and smooth motion. Replacement is the only safe long-term solution, especially with heavy mirror doors.

Do all hinges on a door need to be replaced at the same time? Yes. Different manufacturers or different model ranges often feature distinct pivot points (kinematics). Mixing an old hinge with a new one causes the door to twist and bind during operation, which can rip the screws out of the chipboard.

How can I prevent rust from returning in the bathroom? Ensure adequate ventilation after showering. When purchasing replacement hardware, verify that fittings feature thick nickel plating. Applying a very thin film of acid-free machine oil or silicone spray to the joints after installation helps repel condensation.

Does every 35 mm concealed hinge fit my Pelipal cabinet? The 35 mm cup diameter is standardised. However, you must confirm the correct cup distance (the dimension from the door edge to the start of the hole, typically 3 mm to 6 mm) and the correct mounting plate height/distance. If these parameters match the original hardware, the hinge is fully compatible.