How Do You Choose a Monitor Arm for Your Monitor and Desk?
Summary
Choose a monitor arm by matching the VESA pattern, screen weight without its stand, desktop thickness and mounting clearance. Then confirm that its height and reach can place the screen where you need it. Screen size alone does not establish compatibility, and a flat-screen weight limit may differ from the curved-screen limit on the same arm.
What one spec sheet actually lists
SIIG's single gas-spring arm for screens up to 43 inches is a typical example. Its product page gives these figures, and the right-hand column is what each one has to be compared with.
| Spec | SIIG example | Compare with |
|---|---|---|
| VESA pattern | 75x75, 100x100, 200x100 and 200x200 mm | Hole spacing on the back of your monitor |
| Weight | Flat screens up to 44 lbs (20 kg), curved screens up to 40 lbs (18 kg) | Your monitor's weight without its stand |
| Desktop thickness | 0.39 to 1.8 inches with the C-clamp, 0.39 to 1.6 inches with the grommet | Thickness of the top where the arm will sit |
| Overhang | At least 2.75 inches, C-clamp only | How far the top sticks out past the frame or apron below it |
| Movement | Height up to 24.4 inches, extension up to 20.7 inches | Where the screen has to end up |
Other arms list the same kinds of figures with different numbers. On this one, the curved-screen limit is 4 lbs lower than the flat-screen limit, so a 42 lb curved monitor would pass one line and fail the other.
The monitor side
The hole pattern and the weight are both in the monitor's manual or on its product page. For weight, take the figure for the screen alone. HUANUO's setup guide asks for the weight "without the original stand," which is the number the arm will carry.
Screws are the small surprise. SIIG says its arm "does not include all screw sizes" and points you to the screws that came with the monitor, so keep those when the stand comes off. Our VESA guide covers recessed backs, spacers and adapters.
The desk side
Measure the top at the spot where the clamp will go, which is usually the back edge, not the front. Then look underneath. A frame rail, a cable tray or a drawer runner near the back edge can leave less overhang than the clamp needs, or block the lower jaw altogether.
The material matters as well. HUANUO recommends its reinforcement plate between the mount base and particle-board or glass desktops. That advice concerns its mounts; a plate does not by itself establish compatibility for every desk and arm. Follow the requirements for your specific mounting combination. Our desk-mount and wall-mount guide goes further into mounting surfaces.
Where the screen ends up
OSHA's quick tips for monitors fit in two lines: "Put monitor directly in front of you and at least 20 inches away," and "Place monitor so top line of screen is at or below eye level." Its preferred viewing distance is 20 to 40 inches, measured from your eye to the front of the screen.
Mark the intended clamp or grommet location, then sit as you normally do and identify the screen position you want. Compare that position with the arm's documented height and reach, including any sideways offset. Measure viewing distance to the front of the screen, not to the arm's post or the back edge of the desk. A maximum extension figure alone does not show where the screen will sit at every arm angle; use the manufacturer's dimension drawing to relate the mounting point, joints and monitor plate to your layout.
Browsing for one? Browse monitor arms in the feed →
Sources
- SIIG, Single 43" Gas Spring Monitor Arm Top Mount (CE-MT3111-S3)
- HUANUO, The Ultimate Guide to Setting Up and Adjusting Your Huanuo Monitor Arm
- HUANUO, Frequently Asked Questions
- OSHA Computer Workstations eTool, Monitors
We have not tested these products. Specs and guidance are as published on these pages on the date above and can change; the manufacturer's page for your model has the current details.