Not every monitor will mount on a dual monitor arm, but most modern ones will

A dual monitor arm can hold two displays side by side, but your monitors need to have a VESA mounting pattern on the back — a standardized grid of four holes that the arm's bracket screws into. If your monitor has those holes and weighs less than the arm's weight limit, it will work. If it has a solid plastic back with no holes, or if the manufacturer specifically blocks third-party mounting, the arm cannot attach it.

The real compatibility question is not whether an arm exists that fits your monitors — it is whether the specific arm you are considering fits the specific monitors you own. That requires checking three things: the VESA pattern, the weight capacity, and whether the manufacturer allows it.

Key Takeaways

  • Most monitors made in the last ten years have a VESA mounting pattern — four holes in a square on the back — which is what dual monitor arms use to attach.
  • A monitor without VESA holes, or one heavier than the arm's rated capacity, cannot be mounted on that arm no matter what else is true.
  • Some manufacturers, particularly Apple, deliberately design monitors so they cannot be mounted on third-party arms, even if they have VESA holes.
  • The arm's weight capacity is per monitor, not total — a 10-pound capacity means each of your two monitors must weigh 10 pounds or less.
  • If your monitor lacks VESA holes, a separate mounting bracket can sometimes add them, but this costs extra and may not work with all arm designs.

How to check if your monitor has VESA mounting holes

Look at the back of your monitor. If you see a square or rectangular grid of four holes arranged in a pattern — usually 75 millimeters apart, 100 millimeters apart, or 200 millimeters apart — your monitor has VESA mounting. The holes are typically recessed slightly into the plastic, and they are threaded to accept screws.

If the back of your monitor is completely flat plastic with no holes, or if there is a single central hole with a stand attached, it does not have VESA mounting. Some monitors have a single hole for a pole mount but no VESA grid — that is not compatible with standard dual monitor arms.

Check your monitor's manual or the manufacturer's website if you cannot see the back clearly. Search for your exact model number plus "VESA" — the spec sheet will list the pattern as "VESA 75x75", "VESA 100x100", or similar. If the manual does not mention VESA at all, the monitor almost certainly does not have it.

Understanding VESA patterns and arm compatibility

VESA patterns come in a few standard sizes. The most common are 75x75 millimeters (used on smaller monitors), 100x100 millimeters (mid-size monitors), and 200x200 millimeters (larger monitors). A dual monitor arm will specify which VESA patterns it accepts — many modern arms accept multiple patterns, such as "VESA 75x75, 100x100, and 200x200".

The pattern refers to the distance between the holes, measured in millimeters. A 75x75 monitor will not fit on an arm designed only for 100x100, because the screw holes will not line up. However, most quality dual monitor arms sold today are designed to accept at least two or three common patterns, so this is less of a barrier than it once was.

Before buying an arm, write down the VESA pattern of each monitor you own. Then check the arm's product page or manual to confirm it lists that pattern. If the arm says "VESA 100x100 and 200x200" and your monitor is 75x75, that arm will not work for you.

Weight limits and why they matter for each monitor

Every dual monitor arm has a weight capacity, usually listed as "10 lbs per arm" or "5 kg per monitor". This is the maximum weight each individual monitor can be — not the combined weight of both monitors. If an arm is rated for 10 pounds per monitor, you can mount two 10-pound monitors on it, for a total of 20 pounds on the arm itself.

To find your monitor's weight, check the manual or the manufacturer's website. Search for your model number plus "weight" or "specifications". The weight listed is usually the monitor alone, without the stand. If you cannot find it, weigh the monitor yourself using a bathroom scale or a kitchen scale.

If your monitor is heavier than the arm's per-monitor capacity, the arm may not hold it securely, and it could sag or fall. Do not exceed the rated weight. If your monitor is too heavy for the arms you are considering, look for arms with higher weight ratings — they exist, but they are more expensive.

Manufacturers that block third-party mounting

Apple is the most common example: their Studio Display and Pro Display XDR monitors have VESA holes, but Apple has designed the mounting interface so that only Apple's own stand or arm can attach. The holes are there, but the geometry around them prevents a standard VESA bracket from fitting. If you own an Apple monitor, you must use Apple's mounting hardware or a third-party arm specifically engineered to work around Apple's design.

Most other manufacturers do not do this. Dell, LG, ASUS, BenQ, and other brands with VESA holes allow standard third-party mounting. But before you buy an arm, search online for "[your monitor model] + dual monitor arm" to see if anyone has reported compatibility issues. If the monitor is new or unusual, a quick search can save you from buying an arm that does not fit.

What to do if your monitor lacks VESA holes

If your monitor does not have VESA mounting holes, you have two options: buy a new monitor that does, or use a separate mounting bracket that adds VESA compatibility.

Some monitors come with a proprietary mounting system — a single pole, a specific stand design, or a non-standard hole pattern. In those cases, you can sometimes buy an adapter bracket that attaches to the monitor's existing stand and adds VESA holes. These adapters cost between $20 and $60 and work by clamping or screwing onto the monitor's frame. However, not all monitors have adapters available, and some adapters are bulky or unstable.

Before buying an adapter, confirm that one exists for your exact monitor model. Search "[your monitor model] VESA adapter" or "[your monitor model] VESA bracket". If nothing comes up, an adapter probably does not exist. In that case, your only option is to replace the monitor with one that has built-in VESA mounting.

Testing compatibility before you buy

Write down three pieces of information for each monitor: the exact model number, the VESA pattern (if it has one), and the weight. Then search for the dual monitor arm you are considering and read the product description, manual, and customer reviews.

The product page should list which VESA patterns the arm accepts and the weight capacity per monitor. Cross-check these against your monitors. If both your monitors match the arm's specs, you are likely compatible. If one monitor does not match, that arm will not work.

Read the customer reviews, particularly any that mention your monitor brand or model. If someone has already mounted your exact monitor on that exact arm, they will say so. If you see complaints about a monitor not fitting, even though the specs say it should, that is a red flag — it may mean the manufacturer blocks third-party mounting, or the arm's design has a flaw.

Frequently Asked Questions

Can I use a dual monitor arm if one monitor has VESA and one does not?

No. Both monitors must be compatible with the arm. If one monitor lacks VESA holes, you cannot mount it on a standard dual monitor arm unless you add a VESA adapter bracket first. You would need to add the adapter to the non-VESA monitor, then confirm the adapter itself is compatible with the arm.

What if my monitor is too heavy for the arm I want?

Look for a different arm with a higher weight capacity. Dual monitor arms rated for 15 pounds or more per monitor exist, but they cost more and are heavier themselves. Alternatively, use a single monitor arm for your heavier monitor and a separate stand or arm for the lighter one.

Do I need to remove my monitor's stand to use a dual monitor arm?

Yes. The VESA bracket on the arm replaces the stand. Most monitor stands unscrew or unclip from the back of the monitor. Keep the stand in case you want to use the monitor without the arm later. The monitor itself is not damaged by removing the stand.

Will a dual monitor arm work with curved or ultrawide monitors?

If the curved or ultrawide monitor has VESA holes and weighs less than the arm's capacity, yes. However, curved and ultrawide monitors are often heavier than standard monitors, so check the weight carefully. Also, the arm's reach and adjustability may feel different with a wider or heavier display — read reviews from people using the same monitor model.

Can I mount monitors of different sizes on the same dual monitor arm?

Yes, as long as both monitors have compatible VESA patterns and both weigh less than the arm's per-monitor capacity. A 24-inch and a 27-inch monitor can sit on the same arm if they both have VESA holes and meet the weight limit. The arm may look unbalanced, but it will function.