Drawer Runners Compatible with IKEA Pax

A drawer runner is compatible with an existing wardrobe carcase when the nominal length of the runner matches the carcase depth and the drilling pattern on the mounting level aligns with the existing hole spacing.

Drawer Runners Suitable for IKEA Pax Wardrobes

The modular wardrobe system from IKEA, particularly the Pax series, is widely used in furniture assembly. Over time, it is common to need replacement fittings for worn parts or functional upgrades to retrofit the carcase with bespoke internal drawers. When looking for suitable replacement components or functional upgrades, matching the mechanical parts precisely to the specified carcase properties is essential.

Replacement fittings and full extension drawer runners compatible with IKEA Pax require accurate knowledge of the usable internal depth and the factory drilling pattern of the side panels. Only when these parameters match can smooth operation and a stable fixing of the runners be guaranteed.

Technical Requirements: What to Consider for Compatibility

To successfully integrate runner systems into an existing carcase, fitters and joiners must verify three essential technical criteria.

1. System 32 and the Hole Pattern

Most industrially manufactured wardrobe carcases are based on System 32. This means that the vertical rows of holes in the side panels have an exact spacing of 32 mm between them. The diameter of the drill holes is typically 5 mm. Runners intended to serve as an alternative to IKEA Pax fittings must feature mounting brackets with elongated slots precisely aligned with this 32 mm grid. This enables direct installation using Euro screws without having to drill new holes into the coated chipboard.

2. Carcase Depth and Nominal Length of the Runner

The nominal length of the runner defines the space required inside the cabinet. The Pax carcase is available as standard in two depths: 58 cm and 35 cm (external dimensions). For installation, the clear internal dimension is decisive. Subtracting the thickness of the back panel leaves the following guidelines for runner lengths:

• For a carcase depth of 58 cm, runners with a nominal length of 500 mm are generally used.
• For the shallow version with a carcase depth of 35 cm, space is severely limited. Here, 250 mm drawer runners or a maximum of 300 mm are suitable to avoid colliding with the back panel.

3. Extension Type: Full Extension vs Single Extension

Due to its design, a single extension runner can only be pulled out of the carcase to around 75%. The rear section of the drawer remains inside the cabinet, making access to items stored at the back more difficult. A full extension runner, on the other hand, provides access to 100% of the drawer depth because the telescopic slides extend completely. When retrofitting wardrobes, full extension is the standard choice from an ergonomic perspective.

Suitable Replacement Parts and Alternatives for the Pax System

Depending on the construction of the drawer box (wooden drawer or metal sided box), different runner types suitable for IKEA Pax carcases can be used.

• Ball bearing runners with soft close: Telescopic runners are ideal for traditional wooden drawers that are screwed into place from the sides. Soft close drawer runners absorb the momentum during closing and pull the drawer in gently and quietly over the final centimetres.
• Handleless fronts: If the internal drawer is to operate without a fitted handle, a mechanical opening aid is required. Push to open drawer runners are triggered by light pressure on the front, pushing the drawer open.
• Concealed installation: For high-quality interior fit-outs, the mechanism should remain hidden. Undermount drawer runners are fitted underneath the drawer base. However, they require a specific drawer box construction (notching at the rear of the side cheeks and a defined base thickness).

Installation and Retrofitting of Runners in the Carcase

Retrofitting runners into an existing carcase demands precision. The pre-drilled row of holes in the carcase acts like an exact coordinate system, guiding the fitter to align the runners in a strictly parallel manner.

Required Tools:

• Cordless screwdriver with PZ2 bit (Pozidriv)
• Tape measure or folding rule
• Euro screws (6.3 mm diameter) for existing 5 mm holes
• Alternatively: Chipboard screws (4 mm diameter, countersunk) for alternative hole patterns

Installation Steps:

1. Define the height: Count the holes in System 32 from the bottom to determine the exact same mounting height on both sides of the wardrobe.
2. Position the runner: Place the carcase runner against the row of holes. For undermount runners, the distance to the front edge of the cabinet (setback) must strictly adhere to the manufacturer specifications (often 2 mm to 4 mm behind the front edge).
3. Fastening: Secure the runner first in the front elongated hole using a Euro screw. Align the runner horizontally and insert the rear screw. Use the slotted holes to fine-tune the height or depth.
4. Insert the drawer: For ball bearing runners, the inner member is screwed to the drawer side and then slid into the carcase member. Undermount runners are connected to the drawer via special locking clips.

Frequently Asked Questions (FAQ) Regarding Compatibility

Can I also install heavy duty runners into a wardrobe? Yes, if particularly heavy items need to be stored (for example, dense stacks of winter clothing or solid wood shoe drawers). Heavy duty drawer runners offer load capacities of 45 kg and more. Ensure that the weight of the drawer including its contents does not exceed the specified load rating and that the fixing inside the carcase is secured with sufficient screws.

What is the exact difference between soft close and push to open? These are two opposing mechanical principles. Soft close is a damping system that brakes the drawer during closing. Push to open (often called tip-on) is an ejection mechanism that springs the drawer open during opening when pressure is applied to the front. Combining both mechanisms into a single runner is technically complex and uncommon in standard fittings.

What should I do if the hole pattern of the new runner does not match the cabinet holes exactly? If the elongated holes on the runner do not align with the System 32 of the wardrobe, new holes must be drilled. Align the runner horizontally using a spirit level. Mark the drilling points and pre-drill using a 5 mm wood drill bit (with a depth stop, maximum 12 mm deep) to use Euro screws. Alternatively, direct fixings with 4 mm chipboard screws can be made.