Ergotron Dual Monitor Arm: Which One Still Fits? (Checked)

Affiliate Disclosure: This post contains affiliate links. If you buy through them, we earn a small commission at no extra cost to you. We only recommend products we would genuinely suggest to a friend.

Ergotron sells three different dual monitor arms under names that all sound similar. One of them, the classic LX Dual Side-by-Side Arm, was discontinued in June 2026. If you’re searching for it, you need a replacement, and the two current options fit very different needs.

Yes, an Ergotron dual monitor arm fits most desks and most monitor pairs, but which model fits yours depends on your screen weight, screen size, and desk clamp thickness.

The current LX Pro Dual Direct Arm holds up to 9.4 lbs per screen and fits monitors up to 27 inches. The heavier-duty HX Dual Monitor Arm holds up to 17.5 lbs per arm and fits monitors up to 32 inches. Picking the wrong one means a monitor that droops or an arm that costs more than you needed.

Key Takeaways

• The classic Ergotron LX Dual Side-by-Side Arm was discontinued in June 2026. If you find it listed anywhere, treat the stock as limited and plan for one of the two current replacements instead
• The LX Pro Dual Direct Arm holds up to 9.4 lbs per screen and fits monitors up to 27 inches, with a desk clamp that fits 0.4 to 2.4 inches thick
• The HX Dual Monitor Arm holds up to 17.5 lbs per arm and fits monitors up to 32 inches, with a desk clamp that fits 0.4 to 2.6 inches thick
• Confusingly, the discontinued classic LX Dual Side-by-Side could hold up to 20 lbs per screen, more than its own “Pro” successor. The Pro name does not mean more weight capacity here
• Both current models include a desk clamp and a grommet mount in the box, so your desk doesn’t need a pre-drilled hole either way

Who this is for: This guide is for you if you’re shopping for an Ergotron dual monitor arm and keep finding different weight and size numbers depending on where you look, or you specifically searched for the classic LX Dual Side-by-Side Arm and want to know what to buy instead.

Why “Ergotron Dual Monitor Arm” Means Three Different Products

Three separate Ergotron products answer to the same generic search. The classic LX Dual Side-by-Side Arm is the oldest of the three, and it’s now discontinued. CDW lists its discontinuation date as June 19, 2026, and several other retailers show it as out of stock with no restock planned. The LX Pro Dual Direct Arm is the current mid-tier replacement. The HX Dual Monitor Arm is the heavier-duty option, built for bigger screens.

None of these three share a model number pattern that makes the difference obvious. A buyer comparing listings across different retailers can easily end up looking at specs for one model while reading reviews for another.

If You Were Looking for the Classic LX Dual Side-by-Side Arm

That model, part numbers 45-245-026 and 45-245-224, is discontinued. Multiple retailers, including CDW and Abt, confirm it’s no longer being manufactured. Ergotron’s own retail partners have been steering buyers toward the LX Dual Stacking Arm or the newer LX Pro Dual Direct Arm instead, depending on whether you want to stack monitors or keep them side by side.

This matters for weight capacity specifically. The discontinued classic model held 7 to 20 lbs per screen, a wider and heavier range than its official successor. If your monitors are on the heavier end of that range, don’t assume the LX Pro Dual Direct Arm is simply a newer version with the same capacity. It isn’t.

Full Spec Comparison

Spec	LX Pro Dual Direct Arm	HX Dual Monitor Arm
Status	Current	Current
Weight capacity	Up to 9.4 lbs per screen	Up to 17.5 lbs per arm
Max screen size	Up to 27 inches	Up to 32 inches
Desk clamp thickness	0.4 to 2.4 in	0.4 to 2.6 in
Extension	Up to 27 in	Not published by Ergotron for this spec; verify on the listing
Tilt range	30 degrees individual tilt	Not published by Ergotron for this spec; verify on the listing
Mounting included	Desk clamp and grommet mount	Desk clamp and grommet mount
VESA compatibility	75x75mm and 100x100mm	75x75mm and 100x100mm

Weight Capacity Is Where Most Buyers Get Confused

This is the single number worth double-checking before you buy. The LX Pro Dual Direct Arm’s 9.4 lbs per screen limit is lower than many people expect from a “Pro” model, and lower than the discontinued classic arm it effectively replaces. If you’re mounting two monitors in the 22 to 27 inch range, check your exact monitor’s listed weight first, since many monitors in that size class land right around or above 9.4 lbs once you include the stand mounting plate.

The HX Dual Monitor Arm’s 17.5 lbs per arm gives you much more headroom, and it’s the safer pick if either monitor is on the heavier side or you’re not fully sure of the exact weight.

Screen Size and VESA Compatibility

Both current arms use the same VESA mounting pattern, 75x75mm and 100x100mm, so VESA compatibility isn’t the deciding factor between them. Screen size is. The LX Pro Dual Direct Arm tops out at 27 inches. If either of your monitors is 28 inches or larger, the HX Dual Monitor Arm is your only option between these two.

Which One Should You Buy?

Choose the LX Pro Dual Direct Arm if both your monitors are 27 inches or smaller and each one weighs under 9.4 lbs, which covers most standard office monitors in that size range.

Choose the HX Dual Monitor Arm if either monitor is larger than 27 inches, heavier than 9.4 lbs, or you’d rather have the extra weight headroom for peace of mind.

What to Do If Neither Fits

If you need to stack two monitors instead of placing them side by side, neither of these arms is built for that. Our Ergotron LX Pro Dual Stacking Arm guide covers the model made specifically for stacked setups, with its own separate height limit to check.

If one monitor is much heavier than the other, a single-arm setup per monitor might work better than a shared dual arm. Our Ergotron LX Monitor Arm guide covers the 7 to 25 lb single-arm tier, and our Ergotron HX Monitor Arm guide covers the heavier-duty 20 to 42 lb tier.

Still not sure which model fits your exact monitors? Reach out through our contact form and tell us your monitor sizes and weights, we’re happy to help you check it.

FAQ

Every measurement and spec in this guide comes from our own research. If you notice something that doesn’t match, whether it’s a wrong number or a calculation mistake on our end, tell us through the comments or our contact form. We’ll fix it right away.

Related Guides

• Ergotron LX Pro Dual Stacking Arm: Will It Fit? (Checked)
• Ergotron HX Monitor Arm: Will It Fit Your Desk? (Checked)
• Ergotron LX Monitor Arm: Will It Fit Your Desk? (Checked)
• Will a Dual Monitor Arm Fit Your Desk? (Everything You Must Measure Before Buying)
• Do Monitor Arms Damage Desks? (What Most Buyers Don’t Realize)