Wardrobe Rails & Pull-Outs for IKEA Pax: Easy Retrofitting Guide

A pull-out wardrobe rail enables frontal access to garments and makes optimum use of the cabinet depth, particularly in wardrobes with a depth under 500 mm.

When planning or upgrading a wardrobe such as the IKEA Pax, you are not strictly limited to the manufacturer's own internal fittings. The hardware market offers a wide variety of fittings, runners, and brackets that integrate seamlessly into existing carcasses. The key requirement is knowing the exact internal dimensions and the hole spacing pattern used.

This guide is aimed at installers and skilled DIY enthusiasts looking to professionally retrofit wardrobe accessories. It covers technical specifications, the compatibility of runner systems, and the correct installation of wardrobe rails and pull-outs.

Key Purchasing Criteria for Wardrobe Pull-Outs

Before ordering fittings, the technical dimensions of the existing cabinet must be determined precisely. A deviation of just one millimetre with drawer runners can cause the pull-out to jam or prevent installation entirely.

The System 32 Standard

Most industrially manufactured wardrobes, including the IKEA Pax, are based on System 32. This means:

• The vertical centre-to-centre distance between drill holes is exactly 32 mm.
• The diameter of the pre-drilled holes measures 5 mm.
• The distance from the front row of holes to the front edge of the cabinet is typically 37 mm.

When using third-party fittings, ensure their mounting plates or runners are designed for this grid. Fastening into these holes is best done using Euro screws (specialist screws with a blunt end and wide thread), rather than standard wood screws.

Internal Width vs. External Width

A common mistake when sourcing internal components is confusing external and internal dimensions. A Pax carcass, for example, has a side panel material thickness of 18 mm.

• External width 500 mm = internal width 464 mm.
• External width 1000 mm = internal width 964 mm.

Telescopic wardrobe rails offer some adjustability here, but rigid pull-out systems (such as trouser racks or wire basket runners) must be matched precisely to the internal width (clear opening).

Load Capacity and Leverage

The load capacity is stated in kilograms and refers to the dynamic load (whilst in motion). A pull-out wardrobe rail that extends forwards creates significant leverage on the rear fixing screws when fully extended. For heavy winter coats, models with a load capacity of at least 15 kg are required. For drawers or heavy internal shelves, suitably rated runners must be used.

Overview of Types and Options

Different types of fittings are used depending on wardrobe depth and everyday usage. When retrofitting, the wardrobe carcass functions like a modular grid: as long as the hole centres and widths align, any standardised component will fit into place.

1. The Classic Cross Rail

A standard wardrobe rail is mounted parallel to the back panel. It is suitable for wardrobes with a minimum carcass depth of 550 mm (such as the deep Pax with a 580 mm external depth). Installation is carried out using wardrobe rail end sockets (flanges), which are either inserted into the 5 mm drill holes or screwed directly into the side panel. The standard dimension for oval wardrobe tubes is 30 mm x 15 mm.

2. Front Pull-Out (Telescopic Rail)

For shallow wardrobes (e.g. Pax with 350 mm external depth), cross-rail mounting is unsuitable because coat hangers with an average width of 420 mm - 450 mm would strike the doors. In this case, the wardrobe rail is screwed underneath a shelf and pulled out towards the front. These models usually utilise a ball bearing runner, ensuring smooth operation.

3. Drawer and Basket Runners

When retrofitting wire baskets or internal drawers, the choice of runner is crucial.

• A full-extension runner pulls out 100% from the cabinet, granting full access to the rearmost area.
• A partial-extension runner extends only to around 75%.

In furniture construction, drawer runners full extension are frequently utilised. If particularly heavy loads (e.g. tools or thick stacks of laundry) are stored, drawer runners heavy duty with a load capacity of 45 kg or more are the ideal choice.

Decision Guide: Which System for Which Application?

The choice of suitable hardware depends on the geometry of the wardrobe:

If the wardrobe is very shallow (under 400 mm depth): Do not fit a traditional cross rail. Use a front pull-out rail fixed underneath the upper shelf. Pay attention to the extension length: for a carcass depth of 350 mm, the runner should be a maximum of 300 mm - 330 mm long so that the wardrobe door closes without obstruction.

If heavy loads need to be moved: Standard roller runners quickly reach their limits under high loads. Choose ball bearing telescopic runners made of galvanised steel. These do not twist or warp, even under uneven weight distribution.

If convenience is the priority: Pull-out runners can be equipped with soft-close damping. This mechanism slows the runner down over the final few centimetres and gently pulls it into its closed position. If you wish to retrofit this feature, look for drawer runners with soft close. Do not confuse this with push-to-open mechanisms, which are designed for handleless fronts and pop the drawer open upon pressing.

Installation Notes for Retrofitting

Proper installation determines the durability of furniture fittings. Accurate workmanship is essential when installing accessories in a wardrobe.

Tools Required

• Cordless screwdriver with torque control
• Bits: PZ2 (Pozidriv) for Euro screws and most chipboard screws
• Folding rule or tape measure
• Spirit level or try square
• Bradawl or 2 mm wood drill bit (if no system holes are present)

Installation Steps for Drawer Runners

1. Positioning: Determine the desired height. Use the existing row of holes (System 32). Count the holes from the bottom to ensure exactly the same height on both sides.
2. Runner separation: With ball bearing telescopic runners, the inner profile (carcass member) often needs to be separated from the outer profile (drawer member). This is done by pressing a small plastic release lever inside the runner.
3. Screwing into place: Screw the carcass runner to the side panel. For 5 mm pre-drilled holes, strictly use Euro screws (e.g. 6.3 x 13 mm). If screwing directly into the wood without pre-drilled holes, use countersunk chipboard screws (e.g. 3.5 x 16 mm or 4 x 15 mm).
4. Alignment: Ensure the runner sits horizontally and finishes flush with the intended reference line of the fitting (frequently 37 mm from the front edge).

Installing Under-Shelf Front Pull-Outs

These rails are suspended from above. Ensure that the shelf underneath which the pull-out is fixed is securely connected to the carcass (e.g. via cam and dowel fittings) and not merely resting loosely on shelf support studs. Otherwise, the entire shelf will tip forward when extending a fully loaded clothes rail.

FAQ – Frequently Asked Questions about Wardrobe Retrofitting

Can I install third-party fittings into an IKEA Pax? Yes. The decisive factors are the internal width of the carcass (e.g. 464 mm or 964 mm) and the existing hole pattern. Because IKEA uses the standardised System 32 with 5 mm drill holes, most standard commercial fittings and runners fit, provided they are designed for the corresponding wardrobe depth (350 mm or 580 mm).

How do I determine the correct length for an extendable wardrobe rail? Measure the internal depth of your cabinet from the rear panel to the inside edge of the closed door. Subtract approximately 10 mm - 15 mm from this measurement to ensure the rail does not rub against the door. For a 350 mm carcass, a rail measuring 300 mm in length is typically suitable.

Which screws do I need for the pre-drilled holes in the cabinet? For the 5 mm holes of System 32, use Euro screws. These feature a specialised blunt thread with a diameter of 6.3 mm, which anchors securely into the hole. Standard wood screws do not grip sufficiently in these large holes and will pull out under load.

What is the difference between roller runners and ball bearing runners? A roller runner uses plastic wheels running inside an epoxy-coated steel profile. It is easy to fit but generally offers only partial extension and a lower load capacity. A ball bearing runner consists of interlocking steel profiles with steel ball bearings. It operates more smoothly, allows full extension, and supports significantly higher loads.

How do I prevent pull-outs from slamming shut? Use runners with integrated soft-close damping. The mechanism catches the runner over the final 30 mm - 50 mm of travel and closes it quietly using an internal spring mechanism paired with a hydraulic damper.