Dual Monitor Arm Australia: How to Check It'll Actually Fit Before You Buy

Most monitor arms sent back aren't faulty. They just don't fit.

It's an annoying way to lose a weekend — the box arrives, you clear the desk, and then discover the screws don't line up with anything on the back of your monitor. Or the clamp won't close over your desktop. Or the arm sags under a screen it was never rated for.

All four of those are checkable in about five minutes, before you order. Here's the checklist.

1. Find your VESA pattern

VESA is the square of four screw holes on the back of your monitor. The two common sizes are 75x75mm and 100x100mm, measured centre-to-centre between the holes.

To check yours: tip the monitor face-down onto something soft, look at the back panel, and measure between the screw holes horizontally. If it's roughly 7.5cm, you're VESA 75. If it's 10cm, you're VESA 100.

Two things that catch people out:

• Some monitors hide the VESA holes behind the factory stand. You may need to unclip or unscrew the stand first. Check the manual before deciding your monitor doesn't have VESA at all.
• A few slim consumer monitors genuinely have no VESA mounting. This is more common on budget and all-in-one screens. If there are no screw holes, an arm won't work without a separate VESA adapter bracket.

Our dual monitor desk mount supports both 75x75mm and 100x100mm, which covers the large majority of monitors sold in Australia.

2. Weigh your monitors

Every arm has a per-screen load rating, and it isn't a suggestion. An arm loaded past its rating won't hold position — it'll slowly droop over the following hours, which is the single most common complaint about cheap mounts.

You'll find the weight in your monitor's spec sheet, usually listed as "weight without stand" — that's the number that matters, since the stand comes off.

As a rough guide:

• A 24" office monitor typically sits around 3–4kg without its stand
• A 27" monitor is usually 4–6kg
• Curved and higher-refresh gaming panels run heavier, sometimes 7–9kg

Our mount is rated to 15kg per arm, which leaves comfortable headroom for almost any screen in the 10"–27" range. Headroom matters more than a bare pass — an arm running at 95% of its rating will hold its position far less confidently than one running at half.

3. Measure your desk thickness

This is the step almost everyone skips, and it's the one that most often stops the install dead.

A C-clamp mount grips the edge of your desk, and it has a maximum jaw opening. Measure the thickness of your desktop at the point where the arm will clamp — not in the middle, at the edge, because some desks taper.

Our mount clamps desks up to 7cm thick, which comfortably handles standard office desks, most IKEA tops and the majority of sit-stand frames. Solid timber slabs and some heavy executive desks can exceed that, so measure rather than assume.

Also check what's directly underneath the clamp point. A crossbar, drawer rail or cable tray sitting right under the desk edge will physically block the clamp from closing. Slide 10cm along the desk edge and you can usually find clear space.

4. Confirm your screen size is in range

Screen size matters less than weight, but it still matters. An arm rated to 27" will physically hold a 32" panel if the weight is within limits — but the leverage changes, and the arm may not hold a set position as reliably.

Our mount is rated for 10" to 27" screens. If you're running larger panels, look for an arm specifically rated for them.

One extra thing worth measuring: how far apart your two screens will sit once mounted. Two 27" monitors side by side need roughly 120cm of clear width. If your desk is narrower than that, you'll want to angle the screens inward — which is fine, and arguably better ergonomically, but worth knowing before you set up.

What you get once it fits

Beyond just clearing the desk space the original stands were eating, a good arm gives you adjustment you didn't have before:

• Tilt of -15° to +15°, so you can angle screens to reduce glare from a window or overhead light
• 360° swivel and rotation, letting you flip either screen to portrait independently — useful for code, documents, or long spreadsheets
• Height adjustment, so the top of the screen can sit near eye level rather than wherever the factory stand happened to put it
• Cable management through the arm, which is a small thing that makes a surprising difference to how a desk feels

The frame is SPCC cold-rolled steel and the whole unit weighs 2.73kg, so it's substantial without being awkward to install single-handed.

A quick pre-order checklist

Before you click buy on any dual monitor arm, have these four numbers written down:

1. VESA pattern — 75x75mm or 100x100mm
2. Weight per monitor — without the factory stand
3. Desk thickness at the edge — in centimetres
4. Screen size — diagonal, in inches

If all four are inside the arm's rated range, it'll fit. If any one of them isn't, no amount of goodwill in the installation will fix it.

Ready to set yours up?

Our Dual Monitor Desk Mount covers 10"–27" screens, 15kg per arm, VESA 75/100, and desks up to 7cm — $71.99, dispatched from Australia with 30-day returns.

Still deciding on the rest of the setup? Browse the full Smart Home & Tech collection for desk accessories, cables and peripherals.