Retrofitting Drawer Runners for IKEA Malm
A full extension runner extends by 100%, whereas a partial extension runner releases the drawer box to only around 75%.
When the drawers of a chest block or rub after years of use, or when their closing behaviour is no longer up to modern standards, a mechanical replacement is due. Many furniture carcasses are equipped with simple roller runners as standard in their factory condition. Anyone looking to retrofit drawer runners – suitable for IKEA Malm or identically built furniture – must pay close attention beforehand to the exact installation dimensions, clearance gaps, and runner mechanism.
Upgrading from basic rollers to ball-bearing runners with damping fundamentally changes the mechanics of the furniture. This guide is aimed at installers and DIY enthusiasts who want to modify or repair existing cabinets. The focus is on correctly determining dimensions in millimetres, selecting the right fittings, and achieving precise installation on the carcass.
What to Consider Regarding Compatibility
Before installing new runners, the technical specifications of the piece of furniture must be measured accurately. Furniture made of chipboard or MDF is not very forgiving of misplaced drill holes, which is why the initial measurement is crucial.
1. Installation Width and Side Clearance
The most important dimension when changing the runner mechanism is the side clearance – that is, the free space between the outer wall of the drawer box and the inner wall of the carcass. A classic ball-bearing runner generally requires an exact installation dimension of 12.7 mm per side. If the gap is narrower, the runner jams. If it is wider, the runner profiles do not engage securely with each other, which can cause the drawer to fall out.
2. Runner Length and Carcass Depth
The nominal length of the runner must match the depth of the drawer box, not the external depth of the chest of drawers. For example, if the cabinet is 50 cm deep, the actual drawer box inside often measures only 450 mm. The runner must not exceed the length of the drawer side. For very narrow hallway units or bathroom furniture, drawer runners 250 mm are often used, whereas classic bedroom chests require lengths between 350 mm and 450 mm.
3. Hole Pattern and System 32
Much modern furniture relies on System 32 in industrial manufacturing. This is a standardised row of holes with a continuous spacing of 32 mm between hole centres. The hole diameter is usually 5 mm. When installing replacement parts compatible with IKEA designs, you can often use the existing pre-drilled holes in the carcass. If the hole pattern of the new runner does not match the carcass, new fixing points for the chipboard screws (typically 3.5 mm or 4 mm in diameter) must be set.
Suitable Fittings for Replacement and Upgrades
Depending on the desired result, various mechanical solutions are available. furnica components serve as a functional alternative to factory-fitted parts.
The 1:1 Replacement: Roller Runners
Those who want to keep the original mechanism and simply replace defective parts can turn to drawer runners roller runner. These are made of epoxy-coated steel and plastic rollers. They are designed as partial extension runners. The advantage lies in the high tolerance: side clearance between 12 mm and 13 mm is accommodated without issue, and installation is very forgiving thanks to the simple drop-in design of the drawer box.
The Upgrade: Ball-Bearing Full Extension Runners
For full access to the entire contents of the drawer right to the back panel, drawer runners full extension are the technical standard. The telescopic principle with steel ball bearings ensures smooth travel, even under higher loads. Pay attention to the load rating in kilograms here. For a chest storing clothes, 30 kg is sufficient; for tools or heavy books, heavy-duty variants from 45 kg upwards should be chosen.
Comfort Features: Damping vs. Push-to-Open
Those who want to prevent drawer fronts from slamming against the carcass choose drawer runners with damping. The integrated soft-close mechanism catches the drawer over the final centimetres and pulls it shut silently.
If the chest of drawers is instead intended to have a handleless, flush appearance, a different mechanism is required. For this purpose, drawer runners push to open are installed. Pressing on the front triggers a spring that nudges the drawer box outward. Important for planning: soft-close and push-to-open are opposing physical mechanisms and cannot be combined into a single component on side-mounted telescopic runners.
Concealed Systems
An alternative to side-mounted runners are under-drawer runners. These are mounted invisibly beneath the drawer bottom. They offer a very clean look. However, retrofitting them onto existing drawers often requires routing the back panel and precise recessing into the base, which makes them more complex for a quick replacement in pre-assembled chests of drawers. Those rebuilding the interior entirely can opt directly for complete drawer systems with double-walled metal sides.
Installation and Retrofitting: Step by Step
The mechanics of a piece of furniture function like a fine-tuned gearbox – every millimetre of deviation during installation leads to sticking or rubbing components. Precise workmanship is essential.
Required Tools:
- Cordless drill/driver or manual screwdriver
- Matching bits: check the drive type precisely, PZ (Pozidriv) or PH (Phillips), to avoid damaging screw heads
- Tape measure or folding rule
- Spirit level
- Bradawl for pre-punching screw locations
Step 1: Removal and Preparation Remove all drawers and unscrew the old runners from the carcass and drawer sides. Clean the side panels of dust and wood shavings.
Step 2: Marking the Carcass Profile Separate the drawer profile from the carcass profile of the new telescopic runner (usually via a small black plastic release lever inside the runner). Measure the height of the existing screw holes in the carcass. If you need to alter the height, draw an exact horizontal line using a spirit level.
Step 3: Fitting the Carcass Profile Position the carcass profile against the marked line. The front edge of the runner should sit back approximately 2 mm from the front edge of the carcass so that the drawer front closes flush later. Fasten the runner through the slotted holes. The slotted hole allows for subsequent fine adjustment in height or depth.
Step 4: Securing the Drawer Profile Screw the narrow mating profile centrally onto the outside of the drawer box. Here too, align it flush with the front edge of the drawer box (behind the front panel). Use short chipboard screws (e.g. 3.5 x 15 mm) to ensure the tips do not pierce through the inner face of the drawer.
Step 5: Joining and Adjustment Insert the drawer with the fitted profiles horizontally into the carcass profiles. Push the drawer backward with gentle pressure until the ball bearings audibly engage. Check the alignment and gaps of the fronts. If the drawer sits crooked, loosen the screws in the slotted holes of the carcass profile slightly and correct the height by the required millimetres. Only once everything runs perfectly should the round holes be screwed down for final fixation.
Frequently Asked Questions (FAQ)
Can full extension runners be used as replacements for IKEA Malm drawers? Yes. If the side clearance of the drawer is 12.7 mm, factory roller runners can be replaced with ball-bearing full extension runners. The nominal length of the new runner must match the depth of the drawer box exactly.
What is the difference between a partial extension and a full extension runner? A partial extension runner stops when roughly a quarter of the drawer box is still inside the carcass. The rear section is harder to see and reach. A full extension runner consists of three interlocking sliding profiles, allowing the drawer box to be pulled completely clear of the carcass edge.
Why does my retrofitted drawer not close flush? In most cases, the carcass profile was mounted too far forward. The runner should start 2 mm to 3 mm behind the front edge of the furniture carcass. A protruding screw head that is not fully countersunk in the runner hole (due to using the incorrect PZ or PH drive) can also prevent complete closing.
Can soft-close damping and push-to-open be combined? On classic, side-mounted ball-bearing runners, this is technically not possible. Damping pulls the drawer shut, whereas push-to-open tensions a spring to push it open. You must decide on one system before installation.