How to Choose a Monitor Arm: Gas-Spring vs. Mechanical Explained

How to Choose a Monitor Arm: What It Fixes That a Stand Can't

A fixed monitor stand does one thing: it holds the screen at one height, at one distance, at one angle. That's fine until it isn't — until you need the screen six inches further back to make room for a laptop, or tilted up because you've switched to standing, or pushed sideways so a second person can see it during a call. A stand can't do any of that. A monitor arm can, and understanding that flexibility is the first step in how to choose a monitor arm.

The bigger, less obvious win is desk depth. A stand's base eats several inches of the surface directly in front of you — exactly the space you want free for a keyboard, a notebook, or just your forearms. An arm clamps to the back edge and lifts the monitor off the desk entirely, so that footprint comes back. On a smaller desk this alone can make the difference between a workspace that feels tight and one that doesn't.

If you're working through how to choose a monitor arm, start with what's actually bothering you about the current setup — not enough desk space, a screen that's too low, or no way to angle it for a call — because the mechanism and mount you need follow from that.

Gas-Spring vs. Mechanical-Spring Arms — the Real Difference

Every monitor arm needs some way to counterbalance the weight of the screen so it doesn't just drop. This is usually the first real fork in how to choose a monitor arm, and the difference matters more than it looks like on a spec sheet.

A gas-spring arm uses a sealed cylinder, similar in principle to the one in an office chair, that provides continuous resistance. Nudge the screen and it holds the new position without drifting. These arms tend to feel smooth and require little to no maintenance — you set the tension once at setup and mostly forget about it.

A mechanical-spring arm uses a coiled or tensioned spring instead, adjusted with a hex key or built-in dial. It can hold a monitor just as well, but the tension usually needs to be dialed in for your specific monitor's weight, and it's common to need a small retensioning after the arm settles in over the first few uses. That's not a flaw — it's just a different maintenance model, and for someone who mounts a monitor once and never repositions it again, it may never come up.

Where this shows up day to day: if you adjust your monitor position often — switching between sitting and standing, or repositioning for different calls — a gas-spring arm's one-handed, no-tool movement is worth the difference. If the monitor goes up once and stays there, a mechanical-spring arm does the job for less.

Clamp-Mount vs. Grommet-Mount — Which Fits Your Desk

Almost every arm ships with two mounting options, and the right one depends on your desk, not your preference.

A clamp mount grips the desk from above and below at the back edge, using a screw to tighten against the surface. It requires no drilling and can be removed cleanly, which makes it the default choice for rented apartments, shared spaces, or anyone who isn't sure the desk is a permanent fixture. The catch is that clamp mounts need a certain edge thickness and a bit of clearance underneath — a desk with a thick apron, a drawer, or a rounded edge can make clamping difficult or impossible.

A grommet mount goes through a drilled hole in the desktop and bolts from underneath. It's more permanent and generally feels sturdier under load, since the arm is fastened to the surface itself rather than clamped to an edge. This is the better option for a desk with an apron or drawer in the way, or for a heavier dual-monitor setup where you want the most rigid connection available.

Before ordering, measure your desk's back-edge thickness and check for anything underneath — a drawer track, a cable tray, a support bracket — that would block a clamp's throat depth. If you're not willing to drill, that decision is made for you regardless of which mount you'd otherwise prefer.

Single Arm vs. Dual Arm Setups

One monitor calls for one arm — that part's simple. The more common question is what to do with two screens, and there are two real options: a single dual-monitor arm with a crossbar, or two separate single arms mounted side by side.

A dual-monitor crossbar keeps both screens moving together and enforces the same height and tilt by design, which is useful if you want a clean, symmetrical look and don't plan to reposition the screens independently. Two separate single arms cost more and take up more clamp space on the back edge, but they let you angle one screen toward you and the other flatter, or set one higher for a laptop stand underneath — useful if the two monitors serve different roles, like a primary display and a reference screen off to the side.

Whichever route you take, mismatched height or tilt between two screens is one of the more common self-inflicted comfort problems on a desk. Your eyes will drift toward whichever monitor takes less effort to focus on, and if that's consistently the lower or better-angled one, the other screen stops getting used the way you intended. It's worth spending the extra few minutes at setup to get both screens level with each other, not just level with the desk.

VESA Compatibility and What to Check Before Buying

Nearly every modern monitor has a VESA mounting pattern — a square of four threaded holes on the back — but the pattern comes in more than one size, and an arm rated for one size won't bolt to a monitor drilled for another. Before you buy, check your monitor's specifications for its VESA pattern and confirm the arm you're considering lists that same size as compatible.

The other number worth checking is weight. An arm rated for a lighter monitor than what you're mounting will either fail to hold tension or, at worst, let the screen drift down under its own weight over time. Ultrawide and larger monitors in particular are worth double-checking against an arm's stated weight range rather than assuming any arm will do.

If your monitor doesn't have VESA holes at all — some all-in-one and ultra-thin designs skip them — an arm won't be an option without an adapter plate, and at that point a monitor stand or riser is the more realistic fix for getting the screen to the right height.

Signs an Arm Was a Mistake Before You Even Mount a Monitor

Some problems show up before the monitor ever goes on. If you can catch them at the clamp-tightening stage, you've saved yourself a return.

Wobble at the base is the first tell. Tighten the clamp fully, then push the arm's post side to side with a bit of force — a well-built arm barely moves at the joint; a poorly built one flexes visibly at the clamp itself, which means it will only get worse once a monitor's weight is added.

Drift is the second one, and it only shows up once weight is on the arm: position the screen, let go, and watch it for a minute. Any downward creep means the tension isn't holding, and no amount of readjusting the dial will fully fix a spring that's simply too weak for the monitor you've mounted.

The third sign is harder to describe but easy to feel — adjustment that feels gritty, uneven, or catches partway through its range instead of moving smoothly. That's usually a sign of the joint hardware being the cheapest version of itself, and it tends to get worse, not better, with use. None of these are things a spec sheet will tell you; they're things you notice in the first five minutes of handling the arm.

Setting the Height Once It's Installed

The whole point of doing this work is a monitor that sits where your eyes naturally land, so it's worth getting the final position right rather than eyeballing it.

Sit in your normal working posture and look straight ahead — not up, not down. The top edge of your screen should land roughly at or just below that eye level, which usually means the very top of the monitor, not the center of it. Most people mount an arm and set the screen too high out of habit from years of laptop use, where the screen sits low and you tip your chin down all day.

Distance matters almost as much as height. An arm's reach means you can pull the screen closer or push it back without re-clamping anything, so use that — a screen that's slightly too far away invites you to lean forward, which undoes a lot of the benefit of getting the height right in the first place.

That's really the whole decision tree for how to choose a monitor arm: mechanism for how you'll adjust it day to day, mount for what your desk allows, single or dual for how your monitors actually get used, and VESA and weight rating to make sure it's compatible before it ships. If you want to browse what's actually out there once you've settled on your criteria, our Monitor Arms & Mounts collection is a reasonable place to start, and a cable management solution is worth adding at the same time — an arm changes how cables hang behind the desk, and it's easier to route them once than to redo it later.

Frequently Asked Questions

Do I need to remove my monitor's original stand before attaching it to an arm?

Yes — the arm's VESA plate takes over the job the stand's base was doing, and most monitors are designed to detach cleanly from that stand once you're not using it. Keep the stand and its screws in case you ever want to set the monitor back on a desk without the arm.

Will a monitor arm work on a glass desk?

It depends on the glass's thickness and how the manufacturer rates the clamp for it, since glass can crack under clamp pressure in a way wood or laminate edges don't. A grommet mount is generally off the table too, since drilling into glass isn't something you'd do — check an arm's stated compatible materials before assuming it'll clamp safely.

Can I use a monitor arm on a sit-stand desk that moves up and down?

Yes — since the arm clamps or bolts to the desktop itself rather than the floor, it travels with the surface as the desk raises and lowers. The one thing worth confirming is edge thickness at the desk's thinnest point, since some sit-stand tops taper slightly compared to a standard fixed desk.

Can a dual-arm setup hold two different-sized monitors, like a smaller one paired with a larger one?

Yes, as long as each monitor individually falls within that arm's rated weight and VESA size range — the two arms in a dual setup adjust independently, so the screens don't need to match. Just check the heavier or larger monitor against the weight rating separately rather than assuming an average of the two will do.