Concealed Hinges Compatible with Blum: Finding Fittings for System 32

June 1, 2026

Compatible concealed hinges for existing System 32 drilling patterns strictly require a 35 mm cup diameter, as well as matching overlay types and hole spacing.

Replacing or upgrading cabinet fittings in existing carcase constructions is a daily task in the workshop and on-site. Kitchen cabinets and wardrobes frequently feature hinges from manufacturers such as Blum. When these need replacing—whether due to wear and tear or to upgrade to soft-close mechanisms—it is not mandatory to use the exact same brand. Instead, mechanical and geometric compatibility is decisive. This guide explains the technical parameters a concealed hinge must fulfil to fit seamlessly into an existing grid.

Key Purchasing Criteria for Precision-Fitting Cabinet Hinges

To identify compatible hardware, three critical parameters on the cabinet carcase and the door must be measured accurately. Discrepancies of even a millimetre will inevitably lead to assembly problems or uneven gaps.

1. System 32 and the Cruciform Mounting Plate

System 32 is the international standard in modern furniture construction. It defines a grid of drill holes in the carcase side panel. The distance from the front edge of the carcase to the centre of the first row of holes is exactly 37 mm. The vertical distance between individual drill holes is always 32 mm. The hole diameter for fixing the cruciform mounting plate is typically 5 mm, designed for a standardised Euro screw. If the cabinet is manufactured according to this grid, mounting plates from different manufacturers can be installed, provided the plate's base height (spacer distance) matches (usually 0 mm or 1.5 mm).

2. The Cup Hole in the Cabinet Door

The recess in the door that houses the mechanism is known as the cup hole. For standard doors with a material thickness of 15 mm or more, the diameter is almost always 35 mm. The drilling depth typically ranges between 11.5 mm and 12.5 mm. Compatible 35 mm concealed hinges fit precisely into this recess. Less frequently, and mostly on very lightweight or narrow doors (such as bathroom furniture), a reduced cup size of 26 mm is used.

3. Drill Hole Spacing for Fixing Screws

In addition to the cup itself, the hinge is secured to the door with two screws. There are manufacturer-specific differences here that must be considered during a direct replacement. The Blum drilling pattern usually features a screw spacing of 45 mm. Other systems (such as Hettich) often utilise a 52 mm spacing. If the existing holes in the door are to be reused, the screw spacing of the new hinge must match exactly.

Overlay Types in Detail: Door Position Relative to the Carcase

The geometry of the hinge arm determines how the door rests on the carcase side when closed. Choosing the incorrect overlay type causes the door to bind or prevents it from being mounted altogether.

Full overlay: When closed, the cabinet door covers the front edge of the carcase side almost entirely. Only a narrow gap of roughly 1.5 mm to 2.0 mm remains to the adjacent cabinet. The hinge arm for this variant is straight and has no crank. For this very common application, choose full overlay concealed hinges.
Half overlay (twin overlay): Two doors share a single central carcase partition. Consequently, each door must only cover half of the partition's front edge to allow both doors to open without collision. The hinge arm is slightly cranked (curved) in this case. Half overlay concealed hinges are used here.
Inset: The door does not sit on the front of the carcase side; instead, it closes flush inside the carcase opening. The front edges of the carcase remain fully visible when the door is closed. The hinge arm features a pronounced crank for this design. Suitable hardware can be found under inset concealed hinges or hinges for inset doors.

Opening Angle and Damping: Options for Every Cabinet

The kinematics of the hinge determine the maximum opening angle of the door. This must be tailored to the spatial environment and internal cabinet fittings.

The standard for conventional kitchen cabinets and wardrobes is 110°. This angle provides adequate clearance to access shelves easily. When replacing standard fittings, select 110-degree concealed hinges.

However, if pull-out elements are fitted inside the cabinet, this angle is insufficient. When full-extension runners are installed behind the door (such as internal drawers), the door must swing completely clear of the internal opening, otherwise the drawer will scrape against the door edge. This requires a wide-angle hinge that opens the door to 155° or 165°. Thanks to special joint kinematics, zero protrusion is achieved. Appropriate solutions are provided by 165-degree concealed hinges.

Another technical feature is damping (soft-close). A hydraulic cylinder integrated into the hinge cup or arm decelerates the door's closing movement over the final few centimetres, pulling it shut smoothly and silently. When upgrading kitchen units, switching to soft-close concealed hinges is one of the most common improvements. Important: A soft-close mechanism is the exact opposite of a push-to-open system. Whilst soft-close pulls the door shut, a push-to-open system pushes it open. Both mechanisms cannot be combined within the same hinge.

Decision Guide: Which Concealed Hinge for Which Application?

To avoid ordering errors, follow this systematic comparison of parameters:

If a standard kitchen door (overlay) slams shut and needs upgrading: measure the cup diameter (usually 35 mm) and the screw spacing on the cup (e.g. 45 mm). Choose a full overlay hinge with a 110° opening angle and integrated soft-close.
If two doors are mounted to a single 19 mm central partition: select a half overlay hinge. The cranked arm ensures each door covers only around 8 mm to 9 mm of the panel.
If internal drawers are being retrofitted in a pantry unit: the existing 110° hinges must be removed and replaced with wide-angle hinges (155° or 165°). Ensure hinges with zero protrusion are selected.

Installation and Replacement Advice

Replacing hinges requires precision. When fitting a new System 32 cruciform mounting plate, use the existing 5 mm holes in the carcase side. When inserting the cup into the door, ensure it sits exactly square at a 90° angle to the door edge. Modern fittings feature tool-free clip-on mechanisms: the hinge arm is simply pressed onto the mounting plate until it audibly clicks into place.

Following installation, the door must be aligned across three dimensions. Adjusting the reveals using the eccentric screws is similar to calibrating an optical instrument—a quarter-turn of the screw visibly alters the gap immediately.

Depth adjustment: Regulates the gap between the door and the front edge of the carcase. Essential for the proper operation of the soft-close feature.
Height adjustment: Adjusted via the cruciform mounting plate (usually +/- 2 mm) to align the door horizontally with adjacent doors.
Side adjustment: Modifies the lateral overlay of the door and sets the width of the vertical reveal.

Frequently Asked Questions (FAQ)

Can I replace a Blum hinge with another brand? Yes, this is straightforward as long as the technical parameters match. The cup diameter (normally 35 mm), screw hole spacing on the cup (often 45 mm), and overlay type (full overlay, half overlay, or inset) must be identical. Furthermore, the mounting plate must align with the 32 mm grid of the carcase.

What does System 32 mean in furniture hardware? System 32 is a standardised construction rule in furniture manufacturing. It specifies that holes in carcase sides have a vertical centre-to-centre distance of exactly 32 mm. The distance from the front edge of the unit to the centre of the first row of holes is always 37 mm.

Can I mix soft-close and un-damped hinges on the same door? Yes, this is technically feasible and common practice on lightweight or narrow doors. To reduce costs or prevent the closing force of two dampers from being too stiff on a small door, one soft-close hinge and one standard sprung hinge can be fitted on the same door. However, the kinematics of both hinges must be identical.

Which screws do I need for the cruciform mounting plate? If the carcase side has pre-drilled 5 mm holes according to System 32, you will need specialised Euro screws with a coarse thread. If there are no pre-drilled holes or if they measure only 3 mm, standard countersunk wood screws with a diameter of 3.5 mm to 4.0 mm are used.

Suitable Products and Categories for Your Project

To find the appropriate hinge for your repair or cabinetry project, navigate directly using these specific parameters:

For standard doors and everyday applications: 35 mm concealed hinges
For full overlay doors (end panels of cabinets): full overlay concealed hinges
For doors sharing a central partition: half overlay concealed hinges
For doors sitting flush inside the carcase: inset concealed hinges
For silent closing of cabinet doors: soft-close concealed hinges / cabinet hinges
For cabinets with internal pull-outs (zero protrusion): 165-degree concealed hinges / cabinet hinges