Fitting a Replacement for Hettich Quadro Runners: Mounting Precision Undermount Drawer Runners in System 32

June 7, 2026

An undermount runner is fitted invisibly beneath the drawer base and uses the standard System 32 drilling pattern with a 32 mm hole spacing for cabinet wall installation.

When an existing Hettich Quadro runner develops mechanical faults after years of heavy use in a kitchen cabinet or sideboard, replacing it with a compatible runner is the best course of action. For joiners and experienced fitters, this swap is routine work, provided the nominal length is measured accurately and the fixing positions on the cabinet carcass wall are properly transferred. Replacing such runners requires precise alignment to prevent the drawer box from jamming and to achieve clean, consistent front gap dimensions.

This step-by-step guide covers the removal of old slides, carcass preparation, and the professional installation and adjustment of the new runner system. Pure working time per drawer for an experienced hand is roughly 15 to 25 minutes.

Required Tools and Installation Hardware

For replacing the cabinet runners and drawer locking clips with precision, you will need the following tools and hardware:

Cordless drill/driver with torque adjustment
Matching driver bits: It is essential to use PZ (Pozidriv) or TX (Torx), depending on your chosen screws. A PH (Phillips) bit will strip the head of a PZ screw at higher torque settings.
Folding rule or tape measure
Bradawl or centre punch for marking new fixing points
Screwdriver (PZ2) for manual fine adjustments
Fixing hardware: Euro screws (typically 6.3 x 13 mm) for the 5 mm pre-drilled holes in System 32, as well as wood screws and furniture screws for securing the locking clips to the wooden drawer base.

Step-by-Step Guide: Replacement and Installation

Replacing drawer runners requires a systematic method. The line of drilled holes acts like an invisible grid inside the cabinet carcass, defining the precise positioning of the new fittings.

1. Determine the Nominal Length and Extension Type

Do not measure the old slide; measure the outer depth of the wooden drawer box (excluding the front panel). This length corresponds to the nominal length of the required runner. Common dimensions in furniture construction range from 250 mm to 600 mm. For deep kitchen base units, a nominal length of 500 mm or 600 mm is most common.

You must also decide on the extension type. A full extension runner pulls out 100% from the cabinet, allowing unobstructed access to the entire contents. A single extension (partial extension) opens only to roughly 75% due to its construction. If the cabinet depth allows, upgrading to full extension drawer runners during replacement is recommended for maximum everyday convenience.

2. Removing the Old Drawer Box

Pull the drawer out slightly. Reach underneath the front base and activate the release levers on the left and right locking clips (catches) to release the drawer from the runner. Lift the front of the drawer slightly and pull it horizontally out of the cabinet. Then, unscrew the old carcass runners using the cordless drill/driver.

3. Preparing the Cabinet Carcass and Fitting the Runners

Check the existing drill holes in the carcass wall. The standard System 32 uses a 32 mm hole spacing, with the frontmost hole typically positioned 37 mm from the front edge of the cabinet.

Position the new undermount runner. Ensure the left and right slides are fitted completely parallel and at the exact same height. Use blunt-ended Euro screws to fix the slides into the pre-drilled 5 mm holes. If the old holes in the chipboard are stripped or damaged, use adjacent alternative holes on the slide profile and fix directly into the timber. Sharp wood screws 3.5mm paired with a wood screws PZ2 drive are ideal for this purpose.

4. Fitting New Locking Clips to the Drawer Box

Securing the drawer box onto the new runners requires the dedicated clips designed for that specific runner profile. Turn the drawer upside down. Remove the old catches from the front underside corners. Place the new locking clips flush against the front edge and side wall. Screw them securely in place, ensuring the screws do not pierce through the outer side panel of the drawer box.

5. Inserting and Engaging the Drawer

Extend the newly mounted cabinet runners slightly. Place the drawer box horizontally onto the runners and push it with steady, even pressure backwards into the carcass until the locking clips engage with a distinct click. Pull gently on the drawer to verify that both sides are firmly locked onto the mechanism.

6. Fine-Tuning the Gap Alignment

Modern undermount runners feature tool-free 3D adjustment integrated directly into the front locking clips.

Height adjustment: Turn the thumbwheel on the locking clip to raise or lower the front panel by up to 3 mm.
Side adjustment: Adjust the lateral position to achieve parallel reveals with adjacent doors or drawer fronts.
Tilt / Depth adjustment: If the front panel does not sit flush against the carcass, the tilt angle on many models can be adjusted via a slider mechanism on the rear runner hook bracket.

Common Mistakes and Technical Notes

Even seasoned fitters can encounter pitfalls that compromise smooth furniture operation.

Confusing operating mechanisms: A common error is mixing up comfort features. Soft-close is a damping mechanism that slows the drawer down over the final few centimetres and pulls it gently shut. Push-to-open (tip-on) is the mechanical opposite: an internal spring mechanism pops the handleless drawer forward when pressed. These functions require completely different runner constructions. Always verify whether your setup requires drawer runners with soft-close or drawer runners push to open.

Ignoring weight capacities: Dynamic load ratings are specified in kilograms (kg). For a standard bedroom wardrobe drawer, a 30 kg rating is typically plenty. However, a 90 cm wide pan drawer or larder pull-out requires a significantly higher load capacity. Exceeding the rated capacity will warp the ball cages and slide profiles over time. For these heavy-duty applications, choose heavy duty drawer runners rated for 40 kg to 50 kg.

Incorrect drawer milling dimensions: Undermount runners sit concealed beneath the drawer base. This requires a drawer box constructed with its bottom panel recessed upward by typically 12 mm to 15 mm. In addition, the internal drawer width must precisely match the internal carcass width. With standard 16 mm drawer side thicknesses, the inside width of the drawer box is generally calculated by subtracting 42 mm from the internal carcass width. If these tolerances are incorrect on a newly made drawer box, the runners will bind.

Frequently Asked Questions About Drawer Runner Installation

Can I replace a faulty Hettich runner with a different brand? Yes, provided the hole pattern on the carcass slide conforms to System 32 and the nominal length matches. However, you must always replace the locking clips under the drawer base as well, as catch mechanisms are not interchangeable between different manufacturers.

How do I measure the correct length on a damaged runner? Measure the external depth of the timber drawer box from the back panel to the inside face of the drawer front in millimetres. This dimension corresponds directly to the required nominal length for undermount drawer runners.

What exactly is System 32? It is the global standard in furniture manufacturing and cabinet construction. The pre-drilled holes in the cabinet side have a diameter of 5 mm and a vertical centre-to-centre distance of exactly 32 mm. Cabinet fittings, hinges, and shelf supports are standardised to this grid.

Why does my drawer not close flush over the final millimetres? Check for debris or sawdust inside the ball cages and track profiles. If the runner is clean, the issue is usually caused by carcass runners that are not mounted level or incorrect depth/tilt adjustment at the locking clip. Check the runner alignment using a spirit level.

Related Categories and Replacement Hardware

For complete replacements, building new drawer boxes, or repairing existing cabinets, you will find the appropriate hardware components in these dedicated sections: