Bathroom Cabinet Hinges: Rust-Resistant Concealed Hinges (Pelipal Compatible)

A bathroom cabinet hinge is a concealed furniture fitting that must be manufactured from corrosion-resistant materials due to high humidity levels, precisely matched to the door overlay type.

Bathroom furniture is subjected to demanding environmental conditions. Steam, condensation, and fluctuating temperatures attack the metal components of furniture hardware. Choosing the correct concealed hinges / cabinet hinges determines the longevity of the cabinets. In mirrored cabinets, vanity units, or tall storage units from well-known brands such as Pelipal, standardised European fitting systems are generally used. Replacing or building anew requires precise knowledge of cup hole dimensions, overlay types, and installation measurements.

This technical guide covers the specifications, selection, and installation of moisture-resistant hinges for bathroom furniture.

Overlay Types: The Geometry of the Cabinet Door

The position of the door in relation to the carcase side panel defines the required overlay type. An incorrect hinge results in the door failing to close or colliding with the carcase. Three basic types are distinguished in furniture construction.

Full Overlay (Standard Door)

With a full overlay, the closed cabinet door rests almost entirely on the front edge of the carcase side panel. This is the most common construction method for standalone bathroom cabinets. The visible gap between the door edge and the outer edge of the side panel is usually only 1.5 mm to 2.0 mm. For this design, cranked hinge arms are avoided; the hinge arm is straight. Suitable full overlay concealed hinges ensure that the door swings outwards when opened without rubbing against the side panel.

Half Overlay (Twin Door)

A half overlay is used when two doors are mounted to a single centre partition of the cabinet. Both doors share the front edge of the partition wall (usually 16 mm or 19 mm thick). Each door must therefore only cover half of the edge to leave an adequate gap in the middle for movement. The hinge for this application features a medium crank. Corresponding half overlay concealed hinges are essential for multi-door mirror cabinets or wide vanity units with a continuous centre partition.

Inset (Internal Door)

With an inset door, the door sits flush with the front edge of the carcase side panel. The door does not rest on the front edge, but sits entirely within the internal opening of the carcase. The side panels remain visible from the front. A high crank on the hinge arm is mandatory here so that the door does not collide with the inner face of the side panel when opening. For these clean, flush designs, fitters use inset concealed hinges.

Opening Angles for Bathroom Cabinets

The opening angle determines how far the door can swing open. In the bathroom, the choice of angle depends on the position of the cabinet in the room and its specific function.

• Standard angle: For standard vanity units and tall units, an opening angle of 110° is entirely sufficient. The door opens wide enough to clear internal drawers or pull-outs. 110-degree concealed hinges / cabinet hinges are the industry standard.
• Wide opening angles: For mirror cabinets featuring a three-part mirror system, 155° or 165° hinges are frequently fitted. This allows the user to fold the outer doors far back to view the back of their head in the mirror. Furthermore, the doors do not protrude into the working space above the washbasin. 165-degree concealed hinges / cabinet hinges require zero-protrusion characteristics when internal drawers are installed.
• Special angles: For corner units or angled bathroom furniture fitted under sloping ceilings, angled hinges are available. Depending on the geometry of the carcase, 30-degree concealed hinges / cabinet hinges or 45-degree concealed hinges / cabinet hinges are used.

Materials and Mechanisms in Damp Environments

The climate in a bathroom demands fittings protected against oxidation. Standard furniture hinges are made of steel, which is electro-galvanised and subsequently nickel-plated for bathroom use. This nickel layer seals the pores of the steel and prevents moisture from reaching the base metal. For extreme conditions or direct proximity to showers, pure stainless steel hinges can also be used.

Soft-Close Damping

Modern bathroom furniture closes silently. This is achieved via a hydraulic cylinder integrated into the hinge arm or hinge cup. Concealed hinges / cabinet hinges with soft-close slow down the closing movement of the door over the final centimetres. The damping medium (usually a viscous oil) absorbs the kinetic energy of the closing door.

It is technically essential to strictly separate soft-close damping from opening mechanisms such as push-to-open. Soft-close pulls the door shut and brakes it; push-to-open pushes the door open. Combining both systems within a single hinge is physically impossible. Those planning handleless bathroom cabinets require unsprung or standard hinges in combination with a separate push latch.

Compatibility: Replacement Hinges for Pelipal and Other Brands

If a hinge on a Pelipal vanity unit or mirror cabinet is defective, the entire cabinet does not need replacing. Large furniture manufacturers do not manufacture their own fittings, but rely on standardised supplier components. To find the exact replacement part, three technical parameters must be checked.

1. The Cup Diameter

The standard diameter of the drilling in the cabinet door is precisely 35 mm. This recessed hole accommodates the metal cup of the hinge. Measure the diameter of the old hinge cup. In rare cases (such as very narrow mirrored doors), the diameter may be 26 mm, but the industry standard 35 mm concealed hinges cover over 90% of all bathroom furniture.

2. The Cup Drilling Pattern

Alongside the large 35 mm hole, the cup is fixed to the door using two smaller screws. The distance between these two screw holes (drilling pattern) varies. Common centres are 45 mm, 48 mm, or 52 mm. If the drilling pattern of the new hinge does not match the old one, new pilot holes (usually 3 mm or 5 mm diameter) must be drilled.

3. The Cruciform Mounting Plate and System 32

The hinge is clipped or screwed onto a mounting plate (often called a cruciform mounting plate) on the carcase side panel. Furniture manufacturers such as Pelipal work to the industrial System 32 standard. This means:

• The distance from the front edge of the carcase to the side panel drillings is precisely 37 mm.
• The distance between the two screw holes for the mounting plate is precisely 32 mm.

When purchasing a new hinge complete with a mounting plate, it is generally directly compatible with the existing System 32 drillings in your bathroom cabinet.

Installation and Adjustment of Bathroom Hinges

Fitting new concealed hinges requires precision. A crookedly mounted door will not close tightly, which results in unsightly misalignment, particularly on mirrored cabinets.

Required Tools

• Cordless drill/driver
• PZ2 screwdriver (Pozidriv)
• Folding rule or tape measure
• Try square
• Where applicable, a 35 mm Forstner bit for new drillings
• Wood screws (usually 3.5 mm x 15 mm) or Euro screws

Step-by-Step Installation

1. Dismantling: Remove the old door by loosening the fixing screw on the hinge arm or releasing the clip mechanism on the mounting plate. Unscrew the old hinge cup from the door.
2. Inserting the cup: Place the new hinge into the 35 mm hole on the door. Align the hinge arm precisely at a 90-degree angle to the door edge. A try square helps ensure accuracy here.
3. Securing the cup: Fasten the cup with two countersunk wood screws so that they sit flush with the hinge flange.
4. Attaching the mounting plate: Screw the cruciform mounting plate to the carcase side panel using the existing holes spaced at 32 mm.
5. Hanging the door: Guide the hinge onto the mounting plate. On modern clip-on hinges, the arm snaps onto the plate with an audible click. On older models, slide the arm on and secure it with a fixing screw.

3D Adjustment

The adjustment screws on the hinge work like the steering wheel of a car – minute turns immediately alter the direction and alignment of the cabinet door. Adjustments are carried out across three dimensions:

• Depth adjustment: Loosening the rear screw on the hinge arm (or turning the eccentric cam screw) alters the gap between the door and the carcase. The gap should run parallel and measure approximately 1.5 mm to 2.0 mm to prevent the door from binding when opened.
• Height adjustment: Slotted holes or dedicated adjustment screws on the cruciform mounting plate allow the door to be moved up or down by ± 2 mm, aligning it flush with adjacent doors.
• Side adjustment (Overlay adjustment): The front screw on the hinge arm regulates lateral tilt. Turning clockwise moves the door edge towards the centre of the cabinet; turning anti-clockwise moves it outwards. This ensures the reveal between two doors is set perfectly parallel.

Load Capacity: How Many Hinges Does the Door Need?

Mirrored doors in the bathroom are significantly heavier than plain chipboard doors due to the solid glass weight. The number of required hinges depends on the height and weight of the door. Overloading the hinges leads to premature wear of the soft-close mechanism and causes the door to drop.

• Door height up to 900 mm / weight up to 4 kg to 6 kg: 2 hinges
• Door height up to 1600 mm / weight up to 12 kg to 17 kg: 3 hinges
• Door height up to 2000 mm / weight up to 17 kg to 22 kg: 4 hinges

If a tall bathroom unit features exceptionally heavy mirror fronts, fitting a fifth hinge is advisable. The distance between the hinges should always be maximised to distribute leverage forces optimally across the carcase panel.

Frequently Asked Questions (FAQ)

What is the cup hole diameter for Pelipal hinges?

Brand manufacturers such as Pelipal generally use the European standard diameter of precisely 35 mm. The drilling depth in the wood is usually 11.5 mm to 12.5 mm.

What is the difference between full overlay and inset hinges?

With a full overlay, the door rests over the edge of the carcase side panel and conceals it from the front. With an inset door, the door sits flush inside the carcase opening, leaving the edges of the side panels visible from the front. For this, inset concealed hinges with a high crank are required.

Why does a bathroom hinge rust?

Poor ventilation, condensation from showers, and harsh cleaning agents can damage the protective nickel coating on the hinge. Once the layer is compromised, the underlying steel oxidises. Regular ventilation and wiping condensation off fittings will significantly extend their service life.

Can I retrofit soft-close to an older bathroom cabinet?

Yes. If the old hinges do not have integrated damping, you can either replace the complete hinges with models featuring hydraulic dampers or purchase separate add-on dampers that clip onto the existing hinge arm, provided the original hinge manufacturer produces compatible add-on modules.

How do I repair a stripped screw hole in a chipboard carcase?

When screws for the mounting plate strip out of chipboard, they spin freely. Threaded inserts or metal hinge repair plates provide an effective solution. Alternatively, clean out the stripped holes, plug them with wooden dowels and glue, and redrill into the hardened repair using the standard 32 mm grid.

Do all 35 mm hinges fit onto any mounting plate?

No. Although the 35 mm cup diameter is standardised, the clipping and fixing mechanisms on mounting plates vary between manufacturers (e.g. Hettich, Blum, Salice). A replacement hinge should always be purchased and fitted as a complete set (hinge arm plus matching cruciform mounting plate).

Should I oil or grease cabinet hinges?

Modern concealed hinges are pre-lubricated with lifetime grease at the factory. Spraying penetrating oils (such as WD-40) is counterproductive, as these oils wash away the factory grease and attract dirt. On hinges with hydraulic damping, solvents can also degrade the internal cylinder seals.

Related Categories & Hardware Guides

When repairing or building bathroom furniture, other technical components are equally important. Alongside hinges, drawer systems and organisation fittings play a key role. For humid environments or adjacent utility areas, suitable fittings and accessories include:

• For hygienic waste separation inside a vanity unit, a stainless steel bin offers excellent corrosion resistance.
• When planning wall units above basins, a plate rack for wall cabinets provides an efficient, moisture-tolerant draining solution for wet utensils.
• For heavy overhead lift-up flaps, gas struts for heavy flaps replace traditional hinges and support the flap securely in the open position.
• If cables for shavers, hairdryers, or illuminated mirror LEDs need routing through a back panel or base, a desk cable tidy grommet (equally suitable for bathroom units) ensures tidy and safe cable management.