How to Join Multiple IKEA PAX Units: A Simple Guide

Figuring out how to join multiple IKEA PAX units together is the difference between a row of loose boxes and a closet that looks built in. The frames don't fuse on their own, and parking them side by side leaves gaps, wobble, and door misalignment. We've dug through IKEA's assembly manuals, hardware specs, and owner reports to lay out the exact process.

The core method is simple: dowels and cam locks tie adjacent frames into one rigid run. The non-negotiable part is anchoring. ASTM F2057, the US tip-over standard for clothing storage units, treats any wardrobe taller than 27 inches as a tip hazard.

Here's why the frames won't behave on their own.

Quick Answer

Multiple IKEA PAX units join with cam locks and dowels. The hardware pack inside each frame box supplies these parts. Insert dowels, press frames together, then turn each cam lock snug.

Shim the feet until frame faces sit flush. Anchor the finished run to wall studs with the included bracket.

Why You Can't Just Push Two PAX Frames Together

PAX is a modular system, and modular means the frame is only half the product. The other half is the hardware that turns separate cabinets into a single structure. The current lineup runs 50, 75, and 100 cm wide, at heights of roughly 79 and 93 inches, so most closets need two or three frames minimum.

Push two frames together without joining them and you'll notice three failures within a week. First, the seam. Each side panel is 18 mm particleboard, which flexes under load.

Unjoined panels drift apart and throw a visible shadow line where one should be. Second, the doors. Hinged fronts and sliding rails both assume the frame edges stay in position, so a wandering seam makes doors bind and gaps go uneven.

Third, stability. A lone 93-inch frame holding loaded drawers becomes top-heavy the moment you open it.

A joined run behaves differently, and it shows in the details. In photos of properly joined PAX installs, the seam reads like a pencil line, and shelf edges line up dead straight across frames. The wall-mounting hardware that ships with each frame also assumes a joined run, because anchoring two independent cabinets means anchoring them twice.

One caveat before you buy: frames only join flush at matching depths (13 3/4, 17 3/4, or 22 7/8 inches). A deep frame beside a shallow one creates a step that no hardware can hide. So the joining hardware isn't optional finishing.

It's what makes a row of PAX units act like the wardrobe you actually paid for.

The Hardware That Actually Holds Them (And What's Missing)

Three pieces of hardware do the real work. Wooden dowels slide into pre-drilled holes and handle alignment. Cam lock nuts sit inside recesses on the receiving panel.

Their teeth grip the shaft of a frame bolt as you turn it, and tightening pulls the two panels together with surprising force.

The hardware bag inside each frame box contains these parts, plus the long bolts and a top bracket that ties adjacent frames at the crown. IKEA's official assembly guides map every hole position, and it's worth opening the digital version rather than squinting at the folded sheet.

What the box doesn't include matters just as much. There are no shims for uneven floors, no masonry anchors for brick walls, and no spares if a cam cracks during tightening. IKEA ships replacement cams through its spare-parts service in most markets as of 2026.

Call before improvising, because generic hardware store cams rarely match the hole pattern.

Your tool list is short, and each item earns its place:

One honest warning from aggregate owner reviews: cams crack. Stop when the panel seats snug and resistance jumps. The next quarter turn can split the recess, and a cracked cam won't clamp.

Step-by-Step: Aligning, Doweling, and Cam-Locking

Do the heavy work first. Stand both empty frames upright where they'll live, because a full-height frame is a two-person lift and you don't want to move it twice. Space them about a hand's width apart for now.

Then level each frame on its own. PAX feet screw in and out a few centimeters, so spin them until a level reads flat across the top in both directions. This is the step people rush, and it's why seams gap later.

Now join, following the manual's diagram:

1. Insert dowels. Push four to six dowels into the holes along one side panel, depending on frame height. They should sit snug without needing a hammer.
2. Bring the frames together. Lift and press until the dowels disappear into the mating holes. A second pair of hands helps here.
3. Drop in the cams. The receiving holes sit on the far side of the joint. The manual draws each cam as a circle with an arrow, and the arrow must aim toward the incoming bolt.
4. Turn with a Pozidriv #2. A quarter to half turn clamps the joint. Stop when resistance jumps.
5. Fit the top bracket. It spans both frame tops and adds lateral stiffness the cams alone don't provide.
6. Run the seam test. Close doors across both frames and sight down the gap. If a credit card slides in, go back and shim.

One visual cue from IKEA's diagrams is easy to miss: dowels go in dry. No glue, ever. Glued dowels turn future reconfiguration into a demolition project.

Fixing the Gap: When Floors Are Uneven or Panels Warp

Most seams fail for one of two reasons: the floor or the panel. Both have straightforward fixes if you catch them before final tightening.

Uneven floors are the classic case, especially in older homes where a 100 cm run straddles a slope. The fix is shimming under the low frame's feet until a straightedge laid across both frame tops touches evenly everywhere. What you're looking for is simple: no light under the straightedge at any point along the run.

Once the tops sit level with each other, the front faces follow.

Baseboards cause a sneakier gap. A frame pushed flush against a 5/8-inch baseboard tilts forward at the top, and that tilt opens the joint seam. Notch the baseboard with a handsaw so the frame back sits against the drywall itself.

The notch hides behind the frame, so nobody sees it.

Warping shows up two ways. A bowed side panel bulges toward or away from its neighbor, and shimming can't fix a curve. If a panel visibly warped in storage, order a replacement through IKEA's spare-parts service rather than fighting it.

A bulging back panel is milder: the thin hardboard has popped its staples. Pull the panel square and re-staple, or drive a few brads through it into the frame.

Humidity deserves a final word. Particleboard swells in damp basements and shrinks in dry winters, so a perfect seam in July can creep open by February. Keep cam locks snug rather than gorilla-tight, which gives panels room to move without cracking the recesses.

Safety First: Anchoring Your Combined Unit to the Wall

Joining solves wobble, but nothing solves tip-over except wall anchors. This is the one step with real stakes behind it. The CPSC logs thousands of furniture tip-over injuries every year.

Its Anchor It campaign exists because loaded drawers turn a wardrobe into a lever.

Standards back this up. ASTM F2057, the US safety spec for clothing storage units, covers anything taller than 27 inches and requires a tip restraint. Your PAX frames stand 79 to 93 inches, which puts every configuration in scope.

IKEA includes wall-mounting hardware with each frame, and the manual treats it as a completion step, not an option.

Anchor each frame, not just the run. Here's the working sequence:

• Locate a stud behind the top rail of each frame. A stud finder takes thirty seconds and removes all guesswork.
• Drill a pilot hole through the bracket into the stud, then drive the supplied screw until the bracket stops moving.
• On brick or concrete, skip the stud search and use masonry anchors rated for the bracket's screw size.
• Position heavy drawers and contents low. The anchor is a backstop, not a license to stack.

One more detail people miss: the bracket must attach to the frame's solid top rail, never to a back panel. Those 3 mm hardboard backs hold a shelf's square, not your wardrobe's weight.

Renters, check your lease before drilling. Most allow concealed anchor holes, but masonry drilling in apartments usually needs building approval.

Visual Troubleshooting: Spotting Misalignment Before It Sets

How do you know if the join is failing before it becomes permanent? Look closely at the door hinges. If one door sits slightly lower than its neighbor, the frames aren’t level relative to each other.

This subtle tilt often means a dowel missed its hole or bent during insertion.

Check the vertical seam from eye level. A healthy joint shows no light leakage along the entire height. If you see a thin line of daylight near the top but not the bottom, the upper cam lock likely didn’t engage fully.

Loosen it and retighten gently. Aggregate user reviews indicate that forcing a stiff cam strips the internal threads instantly.

Inspect the back panel area too. Bulging indicates excessive pressure on the side rails. This happens when you overtighten the joining screws.

The particleboard compresses unevenly, pushing the rear outward. You’ll notice this when trying to slide drawers in later. They will bind against the warped frame.

Use a straightedge across the front faces. Place a ruler vertically over the gap between two doors. Any deviation greater than 1mm signals misalignment.

Don’t ignore small errors. They compound with added shelves and hanging rods. Correct them now while the hardware is still accessible.

Waiting until the unit is loaded makes adjustment nearly impossible without disassembly.

FAQs

Can I join PAX units of different heights?

No, standard joining kits require matching heights. Mismatched frames create structural instability. You’d need custom fabrication to bridge the gap safely.

Stick to identical 201cm or 236cm models for seamless results. Mixing sizes voids stability guarantees.

What if my joining kit is missing parts?

Contact IKEA customer service immediately. Replacement hardware packs are available online. Do not substitute with generic screws.

The specific thread pitch matters for cam engagement. Wrong fasteners strip the pre-drilled holes permanently. Order replacements before starting assembly.

How many joints can one person handle?

One person can manage two frames comfortably. Three or more require a second pair of hands. Holding alignment while tightening cams is difficult solo.

Gravity pulls heavy carcasses apart mid-process. Enlist help for larger configurations to ensure precision. Safety risks increase with weight.

Do I need to remove back panels to join?

Not necessarily, but it helps access. Leaving backs attached speeds up setup. However, removing them allows better visibility of dowel holes.

Check your specific model instructions. Some newer designs have reinforced sides that tolerate intact backs. Older models benefit from removal for easier alignment.