Why Is My Monitor Arm Sagging? How to Adjust the Tension

A monitor arm usually sags because its spring tension is set too low for the monitor's weight. Raise the tension a little at a time until the screen holds its height. If it still drifts, check that the monitor is within the arm's weight rating, the joints and VESA screws are tight, and the desk clamp is secure.

Spring-loaded monitor arms are balanced, not locked. The spring inside the arm pushes up with roughly the same force as the monitor pulls down. When the two match, the screen stays wherever you leave it. When they don't, the screen drifts down, or springs up. Most of the time it is a two-minute adjustment.

Why is my monitor arm sagging?

Work through the causes in this order. The first one accounts for most cases.

1. Tension set too low. Arms ship with a factory tension setting that won't match every monitor. A heavier screen than the default pulls the arm down.

2. Monitor too heavy for the arm. Every arm has a weight range per side. If the screen is above it, no tension setting will hold it. Weigh the monitor without its stand; the number on the box often includes the stand.

3. Loose joints. The elbow, the tilt head and the post collar each have a screw or bolt. If one loosens, the arm droops at that joint even with the right tension.

4. Loose VESA screws. If the monitor tilts forward on the mounting plate, the screws holding the plate to the monitor may be loose or too short.

5. Clamp or desk movement. If the whole post leans, the problem is at the clamp: it isn't tight, the desk is thinner or thicker than the clamp range, or the desktop material flexes.

How do you adjust monitor arm tension?

Most arms have a tension adjustment at the elbow joint or at the base of the lower arm, usually turned with the hex key that came in the box. The installation guide for your arm shows exactly where it is and which direction increases tension, so keep it handy.

The general method:

Mount the monitor first. Tension is set with the screen attached, because the spring is balanced against its weight.

Move the arm to the middle of its range. Adjust where you can see the effect in both directions.

Turn in small steps. A quarter or half turn at a time, then let go of the screen and watch. If it drifts down, add tension. If it creeps up, reduce it.

Stop when it stays put at the top, middle and bottom of the range you actually use.

On a dual arm, set each side separately. Two different monitors usually need two different settings.

Lifelong's dual monitor arms use a mechanical spring rather than a gas spring, with an adjustable tension setting on each arm. Follow the installation guide included in the box for the adjustment point on your model.

How do you fix a monitor that tilts forward?

A screen that nods forward while the arm itself holds height is a tilt-joint problem, not a spring problem.

Tighten the tilt joint at the head of the arm, where the VESA plate attaches. It usually has its own screw for tilt resistance.

Check the VESA screws. They should be snug in all four holes. If the monitor's mounting holes are recessed, use longer screws and spacers (many arms include them) so the plate sits flat against the monitor.

Check balance. Curved and ultrawide monitors carry more weight away from the mount. Our article on whether a monitor arm can hold an ultrawide monitor explains why centre of gravity matters as much as total weight.

What if the whole arm leans?

If the post itself tilts toward you, the base is moving.

Re-tighten the clamp until it is firm against the underside of the desk.

Check the desk thickness against the clamp range. A clamp at the very edge of its range grips less.

Check the desk material. Thin particleboard and hollow-core desktops can compress under a clamp over time. A reinforcement plate under the desk spreads the load.

Our VESA and desk compatibility checklist covers desk thickness, materials and grommet mounting, and how to install a dual monitor arm covers clamp setup step by step.

Is it safe to remove a monitor from a tensioned arm?

Take care. A spring arm under tension will try to rise as soon as the weight comes off. Before removing a monitor, move the arm to its highest position, support the screen with one hand, and remove it from the plate. Some manufacturers also recommend lowering the tension first. Check your arm's guide before you take a screen off.

Where should the screen sit once the arm holds?

Once the arm holds height reliably, set the screen where it supports a neutral posture. OSHA's computer workstation guidance recommends the top of the screen at or slightly below eye level, 20 to 40 inches from your eyes, directly in front of you. Mayo Clinic adds that bifocal wearers should lower the screen another 1 to 2 inches.

Which Lifelong monitor arm fits your monitors?

If your arm sags because the monitors are too heavy for it, check the rating before you buy a replacement:

The Lifelong Dual Monitor Arm Mount holds two 17–32-inch monitors, supports VESA 75 × 75 and 100 × 100 mm, and clamps to desks up to 3 inches thick.

The QUARX Heavy-Duty Dual Monitor Stand holds 17–35-inch screens, including curved ultrawides, from 4.4 to 26.4 lbs per arm. It is all-metal, extends 21.7 inches and rises 18.1 inches, and mounts on desks up to 2 inches thick by C-clamp or grommet.

FAQ

Why does my monitor arm slowly drift down over the day?

The tension is slightly under the monitor's weight, or a joint screw is working loose with movement. Add a small amount of tension and re-tighten the joints.

Why does my monitor arm spring back up?

The tension is set higher than the monitor needs. Reduce it in small steps, or check that the monitor is within the arm's minimum weight. Very light monitors can be below the range of some arms.

Can a sagging gas spring be fixed?

Often, by raising the tension. If a gas spring has lost pressure, adjustment won't restore it and the spring or arm needs replacing. Mechanical spring arms don't lose pressure the same way.

Does a sagging monitor arm mean it is broken?

Usually not. Most sagging comes from tension, loose screws or a monitor near the top of the weight range. Check those before replacing the arm.

This article is general information, not medical advice. If you have ongoing pain, talk to a doctor or physical therapist.