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How to choose a monitor arm: VESA pattern, weight range and desk clamps

A monitor arm only works if your monitor's mounting holes, its weight and your desk edge all fit. This guide takes you through each check.

By The PC Journal7 min read

The short answer

Match three things: the VESA hole pattern on the back of the monitor (commonly 75 x 75 mm or 100 x 100 mm), the arm's stated weight range, and a desk edge that suits the clamp or grommet mount. If any of them does not fit, the arm will not hold the monitor safely.

VESA mounts and what they mean

VESA is the standard for the pattern of screw holes on the back of a monitor. The pattern is given as the distance between holes in millimetres, such as 75 x 75 or 100 x 100. Most desktop monitors that support mounting use one of those two, and larger or older screens may use others.

Check the monitor's manual or specification page for a VESA mount line. Some monitors have no VESA holes at all, and some hide them behind a cover or a recessed back panel that needs an adapter or longer screws. Curved and ultrawide monitors can have a pattern that matches the standard but a weight or a curve that limits which arms are suitable.

Also read the arm's page for the supported pattern. An arm that lists only 100 x 100 does not mount a 75 x 75 monitor without a plate, and the plate's own rating should cover the load.

Weight range, arm type and your desk

Gas-spring arms balance the monitor's weight with a spring and let you move the screen with one hand. They work only within a stated weight range per arm, so compare it with the monitor's weight with the stand removed. If the monitor is lighter than the minimum, it can drift upward; if it is heavier than the maximum, the arm may sag.

Static arms have no spring and hold a position once set. They tend to suit lighter monitors or users who adjust rarely. Dual arms hold two monitors on one pole or on two separate arms, and the weight range applies to each screen. Check the maximum screen size in inches as well as the weight, especially for ultrawide models.

Then look at the desk. A clamp grips the desk edge and works with the stated thickness range, while a grommet mount passes through a hole in the desk. Glass tops, hollow or thin desks, and edges with a lip or a rail can make a clamp unsuitable, so check the maker's clearance diagram.

What to look up first

VESA pattern
Find it in the monitor manual or specification page. Check whether the holes are accessible or recessed.
Monitor weight without stand
Look for the listed weight without the stand, as the arm carries the panel only.
Screen size and shape
Check the arm's maximum diagonal and whether it lists curved or ultrawide screens.
Desk edge and thickness
Measure thickness at the mounting spot and note any lip, drawer or back rail.
Cable and port access
Make sure the arm's position still lets you reach the ports and that cables have slack.

Installing an arm

  1. Mount the base first

    Attach the clamp or grommet and tighten it according to the manual. Test it with a light tug before you hang the screen.

  2. Fit the VESA plate

    Attach the plate to the monitor with the supplied screws, using spacers if the back is recessed. Do not substitute longer screws without checking the depth.

  3. Hang and set the tension

    With a helper if the monitor is large, mount the monitor and adjust the tension so it stays put at the height you want.

  4. Route the cables

    Leave enough slack for the full range of movement and secure the cables along the arm.

Mistakes to avoid

  • Using the monitor's weight with the stand included

    Instead: Use the listed weight without the stand.

  • Clamping to a thin or hollow desk

    Instead: Check thickness and the desk's construction, and consider a grommet mount or a support plate.

  • Forgetting the VESA pattern

    Instead: Verify the pattern first, and use an adapter only if the arm's maker allows it.

Where to go next

  1. Best monitor arms
  2. Best single monitor arm
  3. How to set up dual monitors
  4. 24 vs 27 vs 32 inch monitors

Sources

  1. VESA standardsVESA · Reference

This guide explains a decision process. It does not contain product rankings, benchmark results or hands-on measurements. How we research

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