Replacing Single-Extension Drawer Runners: Fitting Replacements for Nobilia Kitchens

February 1, 2026

A single-extension runner allows the drawer to extend to approximately 75%, whereas a full-extension runner offers complete access to 100% of the depth.

Replacing drawer runners in a fitted kitchen is a classic maintenance task in cabinetry. Kitchen manufacturers use standardised fitting systems designed for an extremely high number of cycles. Nevertheless, after years of heavy use—often due to overloading or lateral force—wear and tear can affect the carriages or damper units.

This guide is aimed at fitters and experienced DIY enthusiasts who need to replace a defective kitchen drawer runner properly. With adequate preparation, the actual working time per drawer is around 15 to 20 minutes. The difficulty level is rated as medium, as particular attention must be paid to the exact hole pattern and the correct nominal length.

Technical Fundamentals: Runner Types and Mechanisms

Before disassembly begins, the exact design of the existing runner must be identified. In modern kitchen cabinets, concealed systems are used almost exclusively.

Undermount runner: The runner is mounted invisibly beneath the drawer base. It supports the load from below and provides high lateral stability. This is the standard for high-quality kitchen drawers.
Ball-bearing runner: Usually mounted to the side of the drawer. A telescopic system with steel ball bearings ensures smooth travel. More commonly found on office furniture or workshop trolleys.
Roller runner: A simple system with plastic rollers. Rarely installed in kitchens today, but still found in older models or very lightweight furniture.

In addition, the supplementary function of the runner must be considered. A Soft-Close system decelerates the drawer over the final few centimetres and pulls it shut gently and silently. This damping mechanism must never be confused with Push-to-Open. The latter is an ejection mechanism for handleless frontals that responds to pressure. Both systems require completely different components and spring ratings within the runner.

Required Tools and Materials

To ensure smooth replacement of the drawer runners, having the correct tools is essential. Working precisely prevents tear-out in the cabinet side panel screw holes.

Cordless screwdriver with torque control
Matching bits: Usually PZ (Pozidriv) size 2 or TX (Torx) size 15 to 20
Folding rule or tape measure to determine the nominal length
Replacement runners (in pairs: left and right)
If necessary, new chipboard screws (typically 4 x 16 mm or 3.5 x 15 mm) or Euro screws (for 5 mm diameter pre-drilled holes)
A bradawl or marking awl (if new holes must be marked)

Step-by-Step Guide: Replacing Single-Extension Runners

The runner acts as the mechanical spine of the entire drawer inside the cabinet carcass; if it is out of alignment by just a few millimetres, the entire system will jam. Therefore, proceed methodically.

1. Removing the Drawer

Pull the drawer out as far as it will go. With a modern undermount runner, there are two plastic locking catches on the underside of the drawer (usually at the front, directly behind the frontal). Press the coloured levers of these catches inwards or upwards (depending on the manufacturer) and lift the drawer slightly. Now pull the drawer box forward and off the runners. Set the drawer safely aside.

2. Measuring the Old Runner

Now measure the runner inside the carcass. The critical dimension is the nominal length. This refers to the length of the runner in its closed state and generally corresponds roughly to the depth of the drawer. Common kitchen lengths are 400 mm, 450 mm, or 500 mm. Do not measure the extended section; measure the metal profile fixed securely to the carcass from the front edge to the rear end.

3. Dismantling the Old Runner

Undo the screws securing the runner to the interior cabinet side panel. Note which fixing holes in the runner were used. Most kitchen cabinets are based on System 32, a standardised hole line spacing of exactly 32 mm with a 37 mm setback from the front carcass edge. Take note of whether the runner was fastened into the first or second row of holes. Remove the defective runner.

4. Preparing and Mounting the New Runner

Compare the hole pattern of the new runner with the old one. If you are using an identical replacement part, you can reuse the existing drill holes in the carcass. Position the new runner against the carcass wall. Ensure correct orientation (left and right are not interchangeable). Screw the runner securely into place. For existing 5 mm carcass holes, always use Euro screws, as their thick shank provides the necessary shear strength. For smaller pilot holes, choose pan-head or wafer-head screws. Never use countersunk screws if the runner lacks a countersunk hole, as the protruding screw head will obstruct the carriage.

5. Inserting and Engaging the Drawer

Pull the newly mounted runners in the cabinet fully forward. Place the drawer box horizontally onto the runners. Push the drawer evenly backwards into the cabinet until you hear a distinct click. This clicking sound confirms that the catches on the underside have properly engaged with the pins on the runner.

6. Adjusting the Reveal

Check the alignment of the drawer frontal when closed. The gaps should run parallel to adjacent frontals. Modern fittings offer adjustment options directly on the catch under the drawer or on the drawer side:

Height adjustment: Usually via a small wheel on the catch (adjustment range typically + 2 mm to + 3 mm).
Lateral adjustment: To move the frontal left or right (often ± 1.5 mm).
Tilt adjustment: Usually located on the back panel of the drawer to correct forward tilting of the frontal.

Common Installation Errors

Even experienced installers make mistakes when mixing different fitting systems. Avoid these pitfalls:

Confusing nominal length with carcass depth: The runner must match the drawer depth, not the cabinet depth. A kitchen cabinet drawer 60 cm wide still requires a runner that matches the depth (e.g. 500 mm).
Incorrect screw format: Using screw heads with too high a profile causes the runner mechanism to rub during operation. Over time, this ruins the ball bearings or plastic rollers inside the track.
Ignoring the installation gap: The clearance between the cabinet sides and the drawer (the required installation gap) is specified to the millimetre. With an undermount runner, the internal clearance is often precisely the internal carcass width minus 10 mm to 12 mm. Selecting a runner from a different manufacturer that requires different tolerances will inevitably cause the drawer to bind.

Kitchen Upgrade Options

When a replacement is needed anyway, upgrading the kitchen cabinet hardware is often worth considering.

Those wishing to improve access to the rearmost area of the drawer can check if upgrading from single-extension to full-extension is possible. Drawer runners full extension offer the advantage of pulling the box completely clear of the cabinet front edge. This is particularly practical for deep cupboards. Note, however, that full-extension runners are often structurally thicker or require a different hole pattern. A direct like-for-like replacement without drilling new pilot holes is rarely possible in this case.

For narrower cupboards, such as a kitchen cabinet drawer 30 cm or a kitchen cabinet drawer 40 cm, the exact same installation principles apply. The width of the drawer has no influence on the runner selection, provided the load capacity (carrying capacity in kg) is sufficient for the intended contents.

Maintaining the Rest of the Cabinet Carcass

Once you have removed the drawer box, it is sensible to carry out a quick inspection of neighbouring fittings. Check whether door frontals still close cleanly. Often, dampers in hinges degrade over time. Replacing dated hinges with modern concealed hinges / cabinet hinges with soft close noticeably enhances overall kitchen convenience. For standard doors, concealed hinges / cabinet hinges 110 degrees are typically used.

FAQ – Frequently Asked Questions

Can I repair a drawer runner instead of replacing it? As a rule, no. If steel ball bearings have fallen out of the cage or the damping unit (pneumatic cylinder) has leaked oil, the component is irreparably damaged. A complete replacement of the runner is necessary.

How do I identify the exact model of my old runner? Look for stampings on the metal. Manufacturer logos or part numbers are often visible. If no number is present, measure the nominal length and determine the runner type (e.g. undermount drawer runners). The hole pattern and style of the front locking catch are key indicators for finding a compatible replacement part.

Why is my drawer no longer flush after replacing the runners? This is usually due to improper engagement. Check that the drawer has clicked audibly into the locking catches on both sides. Once fully seated, use the depth or tilt adjustment mechanisms on the underside or back of the drawer to align the frontal parallel with the carcass.

Do I always need to replace both runners (left and right) simultaneously? Yes. Even if only one side appears defective, both runners have endured identical mechanical wear. Furthermore, runners from different brands or product series never match perfectly due to slight variations in running action and damping resistance. Replacing them in pairs prevents the drawer from binding.