Replacement for Blum & Hettich in the Bathroom: Choosing V2A Concealed Hinges with 32 mm Hole Spacing

A V2A concealed hinge is a corrosion-resistant furniture hinge made of stainless steel that, due to its standard 35 mm cup diameter and System 32 dimensions, serves as an exact replacement for conventional fittings from manufacturers such as Blum or Hettich.

Bathroom furniture is exposed to harsh conditions. High humidity, condensation after showering, and chemical cleaning agents attack the metal components of cabinets. When original concealed hinges / cabinet hinges from brands like Blum or Hettich begin to rust, become stiff, or squeak after a few years, a replacement is due.

A direct branded replacement is often expensive or no longer available for older models. The technical solution for humid rooms is switching to non-brand-specific hinges made of V2A (stainless steel). Because the furniture industry is highly standardised, replacement is straightforward provided the hole patterns and mounting types are correctly identified. This guide explains the technical criteria for selecting the matching replacement hinge.

Key Purchasing Criteria for Wet-Room Hinges

When replacing furniture fittings, the geometric dimensions must match the existing drill holes in the carcase and the door precisely. Replacing a hinge in System 32 is like working with a standardised modular system – if the grid dimension matches, the new component fits seamlessly into the old drill hole.

1. Cup Diameter: 35 mm is Standard

The most distinctive feature of a concealed hinge is the "cup" recessed into the routed hole of the cabinet door. On nearly all standard bathroom cabinets, mirror cabinets, and vanity units, this diameter measures exactly 35 mm. Smaller 26 mm variants exist, but these are typically used only on very light or narrow doors. Measure the diameter of the round recess in the door to be certain. In standard cases, choose concealed hinges 35 mm.

2. Hole Pattern: System 32

Fixing the cross mounting plate (the part screwed to the inner side of the carcase) almost always follows System 32. This means:

• The distance between the drill holes is 32 mm.
• The distance from the front drill hole to the front edge of the cabinet is typically 37 mm.

If your defective Hettich or Blum hinge features these dimensions, you can use any compatible hinge manufactured to the same grid.

3. Material: V2A Stainless Steel

Standard hinges are made of nickel-plated steel. This coating provides sufficient protection against corrosion in dry living areas. In the bathroom, however, humid air and micro-cracks in the metal quickly breach this layer, causing the hinge to rust. When buying new fittings, ensure you look for the material specification V2A (stainless steel).

Mounting Types: Full Overlay, Half Overlay, or Inset?

The most frequent error when purchasing replacement hinges is selecting the wrong crank (the bend in the hinge arm). The crank determines how the door sits on the carcase when closed. Check carefully how your bathroom door is mounted before buying.

• Full overlay: The door rests almost entirely on the carcase side panel when the cabinet is closed. The edge of the side panel is not visible from the front. The hinge arm is straight (uncranked). For this, you require concealed hinges full overlay.
• Half overlay (also known as twin overlay): Two doors share a central partition wall. Each door covers only half of the edge, leaving a narrow gap between them. The hinge arm is slightly bent (cranked). The correct choice is concealed hinges half overlay.
• Inset: The door does not rest on top of the carcase sides; instead, it sits flush between the side walls. The edges of the carcase are fully visible from the front. The hinge arm has a pronounced bend (high crank). In this case, choose concealed hinges inset or search specifically for concealed hinges for inset doors.

Opening Angle and Soft-Close Mechanism

Beyond geometry, the opening angle and internal mechanics define user convenience.

The Right Opening Angle

For standard vanity units or mirror cabinets, an opening angle of 110° is the norm. It allows convenient access to the cabinet contents without the door projecting too far into the room. Rely on proven concealed hinges / cabinet hinges 110 degrees here. Special applications, such as corner units, often require wider angles such as 155° or 165°.

Soft-Close vs. Push-to-Open

Many modern cabinets close silently. If you wish to retain this feature, you will need concealed hinges / cabinet hinges with soft-close. An integrated hydraulic damper in the hinge arm gently slows down the door over the final centimetres.

Important for proper function: do not confuse soft-close with push-to-open. Soft-close pulls the door shut and dampens the movement. A push-to-open system requires handleless doors and pushes the door outward after inward pressure is applied. Both systems work against each other and cannot be combined in the same hinge. For handleless bathroom furniture, you need hinges without dampers (often with a catch spring or as free-swinging hinges).

Which Hinge for Which Scenario? (Decision Guide)

To speed up your selection, refer to the following scenarios:

• Scenario 1: Your mirror cabinet has a door that covers the side panel and slams shut loudly.

  Solution: Choose a 35 mm hinge, full overlay, 110° opening angle, with integrated soft-close.

• Scenario 2: Your vanity unit has two doors mounted in the centre on a shared intermediate partition. The hinges are rusting.

  Solution: Choose a 35 mm hinge made of V2A, half overlay, without soft-close (if separate dampers are fitted) or with soft-close.

• Scenario 3: You have a designer bathroom cabinet where the door is set flush inside the frame.

Solution: Choose a 35 mm hinge, inset.

Removal and Installation Advice

Replacing concealed hinges requires precision, but it can be done easily with standard tools.

Tools Required:

• Cordless screwdriver or manual screwdriver
• Matching bits: Pay close attention to the screw heads. Furniture screws usually use PZ (Pozidriv) (often PZ2), and less frequently PH (Phillips). Using the wrong cross-head bit leads to stripped screw heads.
• Folding rule or tape measure to check distances.

Replacement Steps:

1. Detach the door from the carcase. On modern hinges with clip-on technology, simply press the release lever at the back end of the hinge arm. On older models (slide-on), loosen the fixing screw on the mounting plate.
2. Unscrew the old mounting plates from the carcase.
3. Unscrew the old hinge cups from the door.
4. Fasten the new mounting plates into the carcase. Use the existing 5 mm holes (System 32). If the screws no longer grip firmly, use dedicated repair plugs or slightly thicker Euro screws.
5. Fit the new concealed hinge cups into the 35 mm recesses of the door and screw them into place.
6. Clip the door back onto the mounting plates.
7. Use the 3D adjustment (height, depth, lateral overlay) on the adjustment screws of the hinge arm to align the gap pattern accurately.

FAQ – Frequently Asked Questions about Bathroom Hinge Replacement

Can I replace a Blum or Hettich hinge with another brand? Yes. As long as the cup diameter (usually 35 mm), the mounting plate hole pattern (System 32), and the mounting type (e.g. full overlay) are identical, components are cross-compatible across manufacturers.

Why are my bathroom hinges rusting despite being from an expensive brand? Standard furniture hinges are made of nickel-plated steel, designed for living rooms and bedrooms. Continuous exposure to steam and condensation in bathrooms eventually breaks down the nickel plating. Only hinges made from V2A stainless steel withstand this environment permanently.

Must I always replace the mounting plate (cross plate) as well? Yes. Always replace the hinge together with its corresponding mounting plate. The clip mechanisms and plate height alignments differ from one manufacturer to another. A new hinge will rarely lock securely onto an existing third-party mounting plate.

How many hinges do I need for a cabinet door? This depends on the height and weight of the door. For lightweight doors up to 900 mm in height, 2 hinges are generally sufficient. For heights between 900 mm and 1600 mm, fit 3 hinges. Heavy mirrored doors often require one additional hinge compared to standard wood-based doors of the same size.

What does the term "System 32" mean? System 32 is an international standard in cabinet construction. It stipulates that the hole lines in cabinet side panels have a centre-to-centre distance of exactly 32 mm. The drill holes on hinge mounting plates also follow this spacing.

Suitable Categories for Your Project

To find the correct replacement fittings for your bathroom furniture, navigate directly to the appropriate categories:

• Overview of all standard hinges: Concealed hinges / cabinet hinges
• Hinges for full overlay doors: Concealed hinges full overlay
• Hinges for half overlay doors: Concealed hinges half overlay
• Hinges with integrated soft-close: Concealed hinges / cabinet hinges with soft-close
• Classic opening angle for bathroom cabinets: Concealed hinges / cabinet hinges 110 degrees