Adjusting Magnetic Catches: Precisely Setting the Distance Between Magnet and Strike Plate via Slotted Holes

January 26, 2026

A magnetic catch holds furniture doors flush against the carcass through magnetic attraction, with the exact closing position adjusted down to the millimetre via the slotted holes in the housing.

The correct installation and adjustment of magnetic systems in furniture construction requires precision. If the housing sits just one millimetre too far back, the magnet will not make full contact with the metal strike plate, causing the door to rattle. If it sits too far forward, the furniture front will protrude past the front edge of the cabinet carcass, ruining the joint alignment of the entire run of units. Exact adjustment of the gap is essential, particularly on handleless fronts or doors with free-swinging hinges that lack their own catch mechanism.

This guide is aimed at fitters and experienced craftspeople. It covers the mechanical principles of adjustment, the correct use of slotted holes, and how to avoid typical installation mistakes when fitting standard magnetic catches.

Technical Requirements and Parameters

Before beginning the adjustment, the structural parameters must be understood. A furniture catch always consists of two elementary components: the housing containing the integrated permanent magnet, and the metallic strike plate (counterplate) screwed to the inside of the furniture door.

Holding force is typically specified in Newtons or kilograms. For a standard door made of 19 mm thick chipboard, a holding force of 30 N to 40 N is usually sufficient. However, force transmission only works optimally when both components sit completely flush against each other in the closed state. Any misalignment drastically reduces magnetic adhesion.

The catch housing features at least two, usually parallel, slotted holes on its base plate. This oval slot is the central element for depth adjustment. After loosely inserting the screws, it allows the component to be slid back and forth continuously along the horizontal axis (the Z-axis of the cabinet carcass system).

Required Tools and Mounting Hardware

The following tools and materials should be prepared for professional installation and adjustment:

Cross-head screwdriver: Must match the screw drive, usually PZ1 (Pozidriv) or PH1 (Phillips). An incorrect bit will damage the screw head.
Bradawl or a 2 mm wood drill bit to prepare the pilot holes.
Try square and a fine pencil for marking out.
Screws for the housing: Always use pan-head screws (round head) with a diameter of 3 mm or 3.5 mm.
Screws for the strike plate: Countersunk screws are required here so that the head sits flush within the metal plate and does not interfere with the magnetic contact.
A correctly sized magnetic catch including strike plate.

Step-by-Step Guide: Fitting and Adjusting Magnetic Catches

The following systematic approach ensures that the tolerance range of the slotted hole is used to its full potential.

1. Determining Position on the Carcass Side

The catch is generally fitted on the handle side of the door, opposite the hinge side. For tall doors (from around 1200 mm), fitting two catches is recommended – one at the top, one at the bottom. The positioning should take leverage into account. For example, if furniture handles with a hole spacing of 128 mm or 96 mm are fitted to the door, the catch should ideally be placed at the height of this point of applied force to prevent the door front from flexing when pulled.

2. Screwing the Strike Plate to the Furniture Front

First, mount the metal strike plate to the inside of the door. Measure the distance from the door edge so that the plate will later meet the magnet exactly. Make pilot holes using the bradawl. Secure the plate using the countersunk screws. The screw head must not protrude past the metal surface. If the plate features small locating prongs, tap these lightly into the timber with a hammer before driving the screws.

3. Scribing the Datum Point on the Carcass

Close the door (without the magnet housing fitted yet) and align it flush with the front edge of the carcass. With the door closed, measure the exact distance from the front edge of the carcass to the inside face of the door. For an inset door, this corresponds to the door thickness plus a minimal gap clearance. For overlay doors, this measurement is zero, and the catch finishes flush with the edge. Mark this datum point as a fine pencil line on the inside of the carcass.

4. Pre-drilling the Housing in the Centre of the Slotted Hole

Align the magnetic catch with the marked line. Now comes the most important step for subsequent adjustment: mark the drilling points exactly in the centre of the slotted holes. Make pilot marks with the bradawl. By setting the screws in the centre, you will have roughly 2 mm to 3 mm of adjustment travel in both directions (forwards and backwards).

5. Tightening the Housing Hand-Tight with Pan-Head Screws

Drive the pan-head screws into the slotted holes. Do not tighten them fully. The housing must still be able to slide forwards and backwards on the carcass side with gentle thumb pressure.

6. Dynamic Adjustment (Fine-Tuning)

This process is like setting the escapement on a mechanical clock movement – the contact point must be established with zero play. First, slide the housing in the slotted hole approximately 2 mm further forward than the scribed line indicates. Now close the cabinet door slowly. The magnet will catch the strike plate. Push the door from the outside into its exact final position (flush with the carcass). This pressure causes the door to automatically push the loosely fitted housing backwards in the slotted hole to the exact millimetre required.

7. Final Securing

Open the door extremely carefully. Do not pull the door open by the handle; instead, reach behind the front with your fingers and lever the strike plate sideways away from the magnet. The housing on the carcass must not move while doing this. Once the door is open, fully tighten the pan-head screws in the slotted holes using the cross-head screwdriver.

8. Checking Gap Clearance and Closing Force

Open and close the door several times. Inspect the gap alignment. The door must have no play and must not rattle. If the door sits flush at the top but stands proud at the bottom, the lower catch (if fitted) must be readjusted.

Typical Installation Errors

Even with careful work, small mistakes can easily occur in cabinetry that compromise the function of the hardware.

Incorrect screw head shape in the slotted hole: The most frequent error is using countersunk screws for the housing. A countersunk head automatically centres itself in the slot as it is tightened. It bites into the plastic of the housing and forces the component back into the centre of the hole. This mechanically blocks the entire adjustment function of the slotted hole. Exclusively use screws with a flat underside to the head (pan-head / round-head).

Clashing with soft-close hinges: If magnetic catches are used alongside modern concealed hinges featuring integrated soft-close damping, conflicts can arise. The damping slows the door down over the final degrees of closing movement. If the magnet is too weak, the kinetic energy of the door will not overcome the resistance of the damper to make magnetic contact, leaving the door sitting slightly ajar. Unsprung hinges should be used instead.

Strike plate not screwed flush: If the head of the countersunk screw on the furniture front protrudes by even half a millimetre above the metal plate, the magnet will hit the screw head instead of the plate. This drastically reduces the magnetic contact area and causes holding force to drop significantly.

FAQ: Common Questions Regarding Adjustment

Why does the furniture door rattle even though the magnet is engaged? A rattle occurs when the housing has been fixed too far back in the slotted hole. The door strikes the carcass (wood on wood) before the strike plate touches the magnet, leaving an air gap of a few tenths of a millimetre. Loosen the screws slightly and pull the housing forward by one millimetre.

Can the holding force of a magnetic catch be adjusted after installation? No. The magnetic force (measured in Newtons) is physically determined by the built-in permanent magnet. If a door does not hold securely, you must either correct the alignment or install a magnetic catch with a higher holding force rating.

What is the difference compared to a magnetic push-to-open system? A traditional magnetic catch is purely for holding doors closed. Opening requires a furniture handle (such as one with 32 mm hole spacing in the System 32 grid). A push-to-open fitting (tip-on) with a magnetic pin also includes a strong spring. Pressing the front releases the mechanism, and the spring pushes the door open. Gap adjustment on these is usually done via a screw thread on the pin rather than through a slotted hole.

How do I align two catches on a tall door? Always adjust the catch positioned closer to the furniture handle first. Fix it in place. Then loosen the screws on the second catch, close the door, and allow the pressure of the closed door to push the second catch into its final position. This prevents warping and strain on the front.

Related Hardware and Categories

Correct closure of furniture fronts relies on the interaction of multiple components. When refining the closing behaviour of your cupboards, inspect the condition of the hinges as well. For handleless fronts where standard magnetic catches are unsuitable, mechanical push-release systems are used. When planning fittings, always ensure that all hardware components are well matched in terms of kinematics and holding force.