Sizing Push-to-Open Latches for Heavy Cabinet Doors Correctly

A push-to-open door catch triggers a spring mechanism via mechanical pressure on the front to open handleless cabinet doors; for heavy fronts from 15 kg, a long stroke of at least 35 mm to 40 mm is mandatory.

Planning handleless furniture fronts requires precise coordination of fittings when doors have a high dead weight. A large cabinet door made of 19 mm thick MDF or solid wood has considerable inertia. A standard catch with a short stroke is insufficient here to push the door open far enough for a hand to reach behind the edge. Sizing the opening mechanism, selecting the suitable concealed hinges, and accurately adjusting the gap dimension determine the operational success of the construction.

This guide defines the technical parameters that fitters and joiners use to calculate and select the exact ejection system for heavy revolving doors and flaps.

Key Technical Buying Criteria

When selecting a push-to-open catch for heavy loads, several mechanical values must work together. Looking at the component in isolation is not enough; the entire leverage effect of the door is crucial.

Stroke Length

The stroke defines the distance in millimetres that the catch pin extends after being triggered.

• Standard doors (up to approx. 10 kg): A stroke of 20 mm to 25 mm is sufficient.
• Heavy doors (from 15 kg): A long stroke of 35 mm to 40 mm is required. The high mass of the door dampens the initial push. A long stroke ensures that the opening angle at the end of the ejection movement is wide enough to guide the door open manually.

Magnetic Catch vs. Rubber Buffer

Push-to-open catches are equipped with either a magnetic tip or a simple rubber buffer. For heavy, large-format doors (such as on wardrobes), the magnetic version is technically superior. Timber materials move and can warp slightly. The magnet keeps the heavy door flush against the carcase and prevents accidental popping open due to internal material tension. The counterpart, a small metal plate, is recessed into or screwed onto the front.

Hinge Compatibility (Mandatory Consideration)

The ejection system functions exclusively with the correct hinges. A common installation error is combining push-to-open mechanisms with soft-close hinges. Soft-close and push-to-open are opposing mechanisms. The damping of the hinge works against the spring force of the ejector and blocks the door.

Push-to-open catches require Concealed hinges / cabinet hinges without automatic closing (unsprung / non-damped) or special hinges with a reverse spring. The latter do not pull the door shut, but actively push it open after triggering.

Overview of Types and Mounting Options

The design of the ejector determines the installation effort and the visual integration into the cabinet carcase.

Drill-In Push-to-Open Catches

This variant is recessed flush into the front edge of the carcase side panel.

• Drilling: Usually a diameter of 10 mm.
• Depth: Depending on the stroke, often 50 mm to 70 mm deep for long-stroke versions.
• Advantage: Virtually invisible when the door is open, with no obtrusive fittings inside the cabinet.

Screw-On Push-to-Open Catches (with Adapter Plate)

The mechanism clips into a linear or cross-shaped housing that is screwed to the interior carcase wall.

• Advantage: Easy retrofitting, no deep face-edge drilling required. The position can be adjusted afterwards in depth via slotted holes in the adapter plate (usually +/- 2 mm).
• Installation: Often carried out in the System 32 grid (hole line spacing 32 mm, distance to front edge 37 mm).

Which System for Which Scenario? (Decision Guide)

The choice of fittings depends on the mounting type and the opening direction of the heavy front.

Case 1: Heavy, Full-Height Revolving Door (Full Overlay)

When a large cabinet door is mounted as an overlay (as a full overlay), a Push-to-open catch with a long stroke (40 mm) and magnetic tip is the correct choice. To support the weight, at least four to five unsprung hinges must be fitted. If the door needs to open particularly wide, combining it with Concealed hinges / cabinet hinges 155 degrees (without spring) is recommended.

Case 2: Heavy Inset Door

If the door sits flush between the carcase side panels, the opening angle is physically restricted. A hinge designed specifically for an inset door must be used here. Because inset doors often require precise alignment to maintain a uniform gap pattern, a screw-on push-to-open catch with integrated depth adjustment on the housing is ideal. Suitable hinges can be found in the Inset concealed hinges range.

Case 3: Heavy Flaps (Upward Opening)

For upward-opening flaps made of solid wood, a purely mechanical push-to-open latch is not enough to lift the weight against gravity. The push catch works like a starter motor here—it merely provides the initial impulse to push the flap away from the carcase. As soon as the gap is open, a Gas struts for heavy flaps must take over. The force of the gas strut is measured in Newtons (N). For heavy fronts, cylinders with 250 N, 320 N, or more are required, calculated according to the specific flap weight.

Case 4: Heavy Runners and Drawers

When dealing with handleless drawers carrying heavy loads (e.g. for pots or tools) rather than doors, individual push latches are not used. Here, the ejection mechanism must be integrated directly into the runner. A combination of Heavy duty drawer runners (load capacity 45 kg to 80 kg) and the corresponding Push to open drawer runners technology as a full extension runner is the required specification.

Fitting Instructions for Installers

Correct positioning determines mechanical leverage and operating comfort.

1. Positioning: The push-to-open catch must never be mounted close to the hinges. It belongs on the opposite side (the handle side). On tall doors, it is positioned exactly at the height where the user will press later (usually between 900 mm and 1100 mm from the floor).
2. Gap dimension (trigger clearance): To allow the mechanism to release, the door must be able to travel inwards by 2 mm to 3 mm. If the door already sits tightly against the carcase, the ejector will block. The depth adjustment of the hinge mounting plate must be set so that this clearance (front gap) is consistently present when the door is closed.
3. Magnetic counterpart: The metal plate is screwed to the inside of the front, perfectly aligned with the magnetic head (drive type PZ or TX, screw diameter usually 3 mm).

FAQ – Frequently Asked Questions About Push Catches on Heavy Fronts

Can I combine push-to-open with soft-close hinges?

No, this is mechanically impossible. A Concealed hinges / cabinet hinges with damping (Soft Close) actively pulls the door shut over the last few centimetres and keeps it closed. The push-to-open latch would have to push against this damping force, resulting in the door failing to pop open or the latch breaking after a short period. Unsprung hinges must be used instead.

What stroke length is required for doors from 15 kg?

For heavy doors (e.g. 19 mm MDF or doors fitted with mirrored glass), a long-stroke system with a release path of at least 35 mm to 40 mm is required. A short stroke (20 mm) is insufficient to push the high mass far enough outward.

Why does my heavy cabinet door bounce back shut after being pressed?

This happens when standard hinges with an automatic closing spring are used and the push catch has no magnet. The spring in the hinge pulls the door back to the carcase immediately. The solution: a push-to-open catch with a magnetic retainer or switching to hinges without any spring mechanism.

How do I calculate the required Newton force for heavy flaps?

The force of the gas strut depends on flap height and weight (including handle, if present). As a rule of thumb: 1 kg of flap weight requires approx. 10 N of holding force. For a 15 kg flap, two stays with at least 80 N to 100 N each (approx. 160 N to 200 N total) are necessary to safely manage the leverage.

What drill bit do I need for drill-in push-to-open catches?

Generally, a 10 mm diameter wood drill bit is required. The drilling depth varies depending on the model (often 50 mm or 70 mm) and should always be marked using a depth stop on the drill bit to avoid piercing through the carcase panel.

Suitable Categories for Your Project

To implement handleless, heavy furniture fronts, find the matching fittings with the corresponding technical specifications in the following categories:

• Push-to-open catches (Systems with long stroke and magnet)
• Concealed hinges / cabinet hinges (Unsprung basic hinges)
• Concealed hinges / cabinet hinges 110 degrees (Standard opening angle for revolving doors)
• Gas struts for heavy flaps (For upward-opening fronts)
• Push to open drawer runners (For handleless extensions)