Drawer Runners Compatible with IKEA Metod & Pax: Precise Nominal Length Selection

September 27, 2025

The correct nominal length of a drawer runner defines the exact installation depth within the cabinet carcass and determines smooth extension in systems such as IKEA Metod or Pax.

When modifying, repairing, or upgrading IKEA cabinets with alternative hardware, finding runners with the exact required dimensions is essential. Factory-fitted runners are based on standard dimensions adapted to the specific internal carcass depths of each furniture range. This technical guide outlines the precise specifications needed to select the correct runner based on dimensions, weight capacity, and runner type.

Compatibility with IKEA Metod and Pax: Key Technical Factors

IKEA cabinet systems use the industry-standard System 32 drilling pattern. This means the centre-to-centre distance between vertical holes is exactly 32 mm, and the distance from the front cabinet edge to the first line of holes is 37 mm. This standard allows third-party hardware fittings to be installed, provided the nominal length matches the internal carcass depth.

A runner relates to a cabinet carcass much like a chassis relates to a vehicle — if tolerances and dimensions do not match precisely, the mechanism will bind or the front panel will not close flush.

Internal Carcass Depth vs. Nominal Length

The nominal length of a runner describes its overall length when fully closed. It must always be shorter than the internal (clear) depth of the cabinet carcass.

IKEA Metod (Kitchen): With a nominal external depth of 600 mm, the clear internal depth (excluding the back panel and front) is typically around 580 mm. Runners with a nominal length of 500 mm or 550 mm are standard here. For shallow wall units (external depth 370 mm), the internal depth is approx. 350 mm.
IKEA Pax (Wardrobe): The deep carcass measures 580 mm externally, leaving approximately 560 mm internally. Runners with a length of 500 mm are suitable. The shallow carcass measures 350 mm externally and approx. 330 mm internally, requiring shorter runner variants.

For shallow cabinets or bespoke alcove storage solutions, compact dimensions such as drawer runners 250 mm are utilised.

Core Selection Criteria for Drawer Runners

To identify the correct replacement or upgrade fitting for your cabinet, four key technical parameters must be established.

1. Extension Type: Full Extension vs Single Extension

A full extension runner pulls out 100% from the cabinet carcass. The extension travel matches the nominal length exactly. This is standard in modern kitchens and deep wardrobes, as the entire contents right to the back corner remain accessible. A single extension (partial extension) runner exposes only about 75% of the drawer depth due to its mechanical construction, leaving the back section inside the carcass.

For maximum visibility in deep units, full extension drawer runners provide superior access.

2. Load Capacity in Kilograms

Load ratings always specify the total weight (drawer box plus front panel plus contents) supported per pair of runners.

10 kg - 15 kg: Suitable for shallow, lightweight drawers (cutlery, stationery).
25 kg - 35 kg: Standard rating for clothing in Pax wardrobes or standard cookware in Metod units.
45 kg - 60 kg: Required for wide drawer boxes of 600 mm width and above storing crockery, cast iron pans, or tools. Here, heavy duty drawer runners are essential to prevent drawer sag when fully extended.

3. Runner Mechanism Type

The bearing and mounting method dictate running smoothness and installation requirements.

Ball bearing runners: Steel ball bearings run inside a precision profile. These runners are typically side-mounted (or occasionally base-mounted). They carry high loads and require an exact installation clearance between the drawer side and internal carcass wall (usually 12.7 mm per side).
Undermount runners: Concealed underneath the drawer base. This is standard in modern kitchen systems like Metod. The drawer box sits onto the runners and locks in place via fixing clips.
Roller runners: A straightforward mechanism where nylon rollers run along epoxy-coated steel channels. Suited for lighter loads and more forgiving of slight carcass width deviations. Relevant hardware can be found under roller drawer runners.

4. Closing Mechanisms: Soft-Close vs Push-to-Open

In purely mechanical systems, these two functions are mutually exclusive.

Soft-Close: Integrated damping (often paired with a self-closing spring) decelerates the drawer over the final few centimetres and pulls it shut silently. This spring resistance must be overcome when pulling the handle to open. Options are available under soft close drawer runners and self closing drawer runners.
Push-to-Open: A mechanical release system for handleless frontals. Applying pressure to the front releases a spring that pushes the drawer forward. To close, the drawer must be pushed firmly back until the spring re-engages. Such fittings are listed under push to open drawer runners.

Choosing the Right Runner for Specific Applications

Hardware selection depends directly on the internal carcass width and intended storage load.

For wide kitchen base units (Metod): When storing heavy pots and crockery, an undermount full extension runner rated at least 40 kg with integrated damping is recommended. For standard 600 mm pan drawers, select kitchen cabinet pull out 60 cm fittings.
For narrow kitchen/bathroom units: Narrow widths create less lateral leverage, allowing lower load capacities (25 kg to 30 kg is generally adequate). These applications utilise kitchen cabinet pull out 30 cm or kitchen cabinet pull out 20 cm components.
For wardrobes (Pax): Wide drawers holding heavy clothing require full extension runners. When fitting internal drawers behind hinged doors, ensure side clearances do not clash with door hinges.
Upgrading existing cabinet carcasses: Retrofit sets and components can be browsed across the kitchen cabinet pull outs range.

Installation Guidelines: Fitting into the Carcass

Accurate fitting is vital. The pre-drilled System 32 hole pattern simplifies positioning the carcass rails.

Locate mounting holes: The front edge of the runner typically aligns with the first system hole (37 mm from the front edge of the carcass side).
Fastener selection: For pre-drilled 5 mm system holes, use dedicated blunt-threaded Euro screws. When securing runners into un-drilled areas, use countersunk wood screws (diameter 3.5 mm or 4 mm with PZ or TX drive).
Installation clearance: For side-mounted ball bearing runners, calculate the drawer width precisely: Internal carcass width minus 2x runner thickness (typically 12.7 mm) = external drawer box width. For undermount runners, follow the specific milling and rebate dimensions for the drawer base.
Alignment: Runners must be installed perfectly level and parallel. A deviation of just 1.5 mm in height or depth can cause binding in roller or ball bearing tracks.

Frequently Asked Questions (FAQ)

Can I combine IKEA drawers with runners from other manufacturers? Yes, provided the mounting style (usually undermount) and the front-locking clip mechanisms match. For ball bearing runners, side clearances must match precisely, and the nominal length must fit the carcass depth.

What is the difference between nominal length and extension loss? The nominal length is the physical length of the closed runner out of the box. Extension length indicates how far the drawer travels outwards. With full extension, both values are identical; with partial extension, travel is shorter than nominal length.

Why cannot Push-to-Open and Soft-Close be combined mechanically? They operate on opposing mechanical forces. Soft-close pulls the drawer shut and requires pulling force to open. Push-to-open forces the drawer open and requires pushing force to cock the spring. In standard mechanical runners, these actions cancel each other out.

Which screws are required for System 32 installation? For factory 5 mm drillings in IKEA carcasses, use 6.3 mm Euro screws. For direct screw fixings into chipboard, use 3.5 mm or 4 mm wood screws with lengths between 15 mm and 17 mm (suited to 18 mm board thicknesses).

How do I measure the required runner length? Measure the internal depth of the carcass from the inside of the back panel to the front edge of the side panel. Deduct at least 10 mm to 20 mm clearance. The resulting figure represents your maximum usable nominal runner length.