Drawer Runners Compatible with IKEA Brimnes: Lengths, Dimensions & Full Extension

A full extension runner can be pulled out 100% from the carcass, whilst a partial extension stops by design at around 75%, leaving the rear section of the drawer concealed.

Replacing or upgrading drawer runners on IKEA Brimnes furniture is a common project for fitters and ambitious DIY enthusiasts. The factory-fitted runners serve their basic purpose, but they often lack the comfort of modern runner systems. Anyone wishing to upgrade to full extension, higher load capacity, or soft-closing must take into account the exact technical specifications of both the carcass and the drawers. Replacing a drawer runner is like changing a tyre on a car: the dimensions must match the rim precisely for the system to run smoothly.

This guide explains the key technical criteria for selecting compatible drawer runners and highlights what to consider during the replacement process.

Key Buying Criteria for the Upgrade

To replace an existing runner, simply comparing the visual design is not enough. The mechanical dimensions must match down to the millimetre; otherwise, the drawer will jam or fail to fit altogether.

Nominal Length and Installation Depth

The nominal length describes the actual length of the runner when closed. This must match the depth of the drawer side panel. On Brimnes chests of drawers, depths vary depending on the exact model (bedside table, large chest of drawers, bed storage box). Typical dimensions for standard chests of drawers often range from 350 mm to 400 mm. Measure the outer edge of the drawer from the back panel to the inner edge of the front panel. If the drawer side measures 350 mm, for example, you need drawer runners 350 mm. If the carcass is deeper and the drawer measures 400 mm, opt for drawer runners 400 mm. The runner must never be longer than the internal depth of the carcass, as the drawer will otherwise not close flush.

Installation Width (Side Clearance)

The installation width is the most critical dimension during an upgrade. It defines the gap between the outer drawer side panel and the internal carcass wall. Standard metal ball-bearing runners generally require a side clearance of exactly 12.7 mm per side. If the original runner was narrower (for instance, 10 mm), a wider runner cannot be fitted without structurally narrowing the drawer itself. Measure this gap precisely using a vernier calliper.

Load Capacity in Kilograms

For clothing and lightweight everyday items, a dynamic load capacity of 25 kg to 30 kg is entirely sufficient. However, if the drawers are used to store heavy items such as tools, thick stacks of paper, or heavy textiles, standard runners reach their limits. In such cases, fitting heavy-duty drawer runners rated for loads of 45 kg and more becomes necessary. The load capacity always refers to the pair (two runners), including the dead weight of the drawer itself.

Hole Pattern and System 32

Professional cabinet making relies on System 32. This means the drill holes in the carcass are spaced 32 mm apart and start 37 mm from the front carcass edge. Mass-produced furniture often uses alternative, proprietary hole patterns. When replacing runners, it is therefore very likely that you will need to drill new pilot holes into the carcass, as the holes on the new runner will not necessarily align with the old ones.

Overview of Drawer Runner Types

Three primary mechanical systems are available for furniture construction, differing significantly in design and running performance.

Roller Runners

The roller runner is the simplest and most widespread system in the entry-level segment. It consists of two epoxy-coated steel profiles and plastic rollers. It is supplied as a partial extension and is forgiving of minor installation tolerances. Replacement is straightforward if you stay within this system. Corresponding roller drawer runners usually require a side clearance of 12.5 mm.

Ball-Bearing Runners (Telescopic Runners)

The ball-bearing runner is the preferred choice for upgrades. It consists of interlocking steel profiles that run on small steel balls. This system provides a true full extension, offers outstanding lateral stability, and operates more smoothly. Almost all full extension drawer runners rely on this ball-bearing telescopic principle. However, they require absolute precision regarding installation width (12.7 mm), as they do not tolerate lateral variations.

Undermount Runners

An undermount runner is fitted invisibly beneath the drawer base. It delivers the highest running comfort and excellent stability. However, retrofitting these onto existing Brimnes drawers involves substantial mechanical effort. The drawer must be structurally prepared for this (downward-protruding side panels, defined base panel thickness). For a direct replacement without woodwork, this system is not suitable.

Which System for Which Application? (Decision Guide)

The choice of runner mechanism depends on the desired level of convenience and the DIY effort involved.

• If you want full access to the back of the drawer: Always choose ball-bearing full extension drawer runners. This ensures no socks or documents are lost in the dark rear section of the carcass.
• If the drawer needs to close silently: Look for integrated soft-close damping. This system catches the momentum of the drawer over the final few centimetres and pulls it shut gently and silently. Soft-close drawer runners are ideal for bedroom chests.
• If you prefer a handleless front: This is where push-to-open comes in. Pressing the front releases the drawer so it pops open slightly. Note: Soft-close and push-to-open are mechanically opposing functions. Soft-close brakes and pulls, whereas a push system tensions and ejects. Combining both functions within a single runner is only possible with highly complex, specialist fittings.
• If you need a quick and easy fix: Replace a defective roller runner like-for-like with a new roller runner of the exact same length.

Installation Advice for DIYers

Replacement requires precise work. Inaccuracies will inevitably lead to jamming drawers.

Required tools:

• Cordless screwdriver or screwdriver with a PZ2 bit (Pozidriv)
• Folding rule or tape measure
• Bradawl or small punch
• Suitable countersunk chipboard screws (typically 3.5 x 16 mm)

Step-by-Step Procedure:

1. Remove the drawer completely from the carcass.
2. Dismantle the old runners from both the drawer and the internal carcass wall.
3. Measure the exact height of the old fixing holes in the carcass from the bottom panel and mark this line (level with a spirit level).
4. On a new telescopic runner, separate the inner profile (drawer section) from the outer carcass section using the small plastic release lever.
5. Screw the carcass section onto the marked line, flush with the front carcass edge (or with the required setback for the front panel).
6. Screw the inner profile to the lower side edge of the drawer.
7. Insert the drawer horizontally into the carcass until the profiles audibly engage.

Frequently Asked Questions (FAQ)

What runner length do I need for a Brimnes chest of drawers? This depends on the specific piece of furniture (bedside table, 3-drawer chest, 4-drawer chest). Measure the outside of the drawer from front to back. Common sizes are 350 mm or 400 mm. The new runner must match this length exactly or be slightly shorter.

Can I simply replace a partial extension with a full extension runner? Yes, provided the lateral installation clearance is identical. Most ball-bearing full extension runners require 12.7 mm of space between the drawer and the carcass wall. If this measurement matches, upgrading is straightforward by drilling new pilot holes.

Why does the drawer jam after installing the new runners? There are usually two causes: either the runners were not fitted precisely level and parallel to each other, or the side clearance is too tight. If the gap between the carcass and the drawer is smaller than the required 12.7 mm, the telescopic runner is mechanically compressed when pushed in, causing it to seize.

Can I use soft-close and push-to-open simultaneously? On standard ball-bearing runners, this is not possible. Soft-close uses a spring-loaded hydraulic damper that pulls the drawer inward. Push-to-open uses a spring mechanism that pushes the drawer outward. You must choose between one of these two comfort features.

Which screws should I use for fixing? Use only countersunk chipboard screws. The diameter should be 3.5 mm or 4.0 mm, with a typical length of 15 mm or 16 mm. A countersunk head is essential so that the screw sits completely flush within the runner profile. If the screw head protrudes, it will collide with the ball cage and damage the runner.

Suitable Products & Categories for Your Project

To find the right hardware component for your furniture upgrade, first measure your drawers and then select the corresponding mechanism from our range:

• For complete access to the entire drawer interior: full extension drawer runners
• For gentle, silent closing of drawer fronts: soft-close drawer runners
• For high load capacities in workshops or offices: heavy-duty drawer runners
• The simple 1:1 replacement for standard furniture: roller drawer runners
• Suitable for shallow chest depths: drawer runners 350 mm