Most desk arms take screens up to 32 in, some up to 34 or 35 in, weighing about 2 to 9 or 10 kg (4.4 to 19.8 or 22 lb) each. Check both figures against your monitor — without its stand. The weight decides whether the spring can hold the screen; the size decides the leverage on the arm and, on a dual mount, whether two screens fit side by side.
What our arms state. In our monitor arms hub, the single arms run:
- Acer: 17 to 34 in, 2 to 9 kg (4.4 to 19.8 lb).
- Ergotron LX Pro: up to 34 in, 1.8 to 10 kg (4 to 22 lb) — the highest ceiling.
- HUANUO: 13 to 32 in, 2 to 9 kg.
- Invision MX200: 19 to 32 in, 2 to 9 kg.
In our dual monitor mounts hub, most take up to 32 in and 2 to 9 kg per arm; the Digitus goes to 35 in and 10 kg (22 lb), the Mount-It and VonHaus stop at 8 kg (17.6 lb) per screen, and HUANUO’s smaller dual clamp mount at 27 in.
Weigh the monitor, not the box. A spec sheet often gives the weight with stand and without; the arm only carries the panel. Two monitors of the same size can differ by kilograms depending on the panel, the casing and built-in speakers. Check the minimum too: a light screen can be too light for even the lowest spring setting and will keep rising — setting spring tension explains.
Why size still matters. A wider screen puts its weight further from the arm’s joints, so it loads them harder at full reach and is more likely to droop. On a dual mount, two 32 in screens side by side need about 1.5 m (5 ft) of width; check the arms can spread that far without the screens touching.
Curved and ultrawide screens. They are often heavier than a flat screen of the same diagonal, their centre of gravity sits further forward, and a 34 in ultrawide is about 80 cm (31.5 in) wide, against about 71 cm (28 in) for a 32 in 16:9 screen. Choose an arm that names curved screens — the VIVO, MOUNTUP and Mount-It dual mounts do — and keep the weight well inside the range.
Check the mounting holes too. All the single arms here take VESA 75 and 100 — see VESA 75 vs VESA 100 — and the clamp must fit your desk: measuring desk thickness for a clamp.
Last reviewed 13 October 2026