LX Dual Side-by-Side Arm (white)
The Ergotron LX Dual Side-by-Side Arm gives two monitors a clean, adjustable setup without giving up desk space. Each arm uses Constant Force motion technology for smooth height adjustment, and the arms fold back when you want the desktop clear. It is built for two monitors up to 27 inches, with VESA 75 x 75 mm or 100 x 100 mm compatibility. The included desk clamp attaches to desk edges up to 2.6 inches thick. Sold by goodshelf. Confirm your monitor weight (7-20 lb per arm) and VESA pattern before you mount.
Why it's on the shelf
- You want two monitors up to 27 inches in a side-by-side layout.2
- You need a desk-edge clamp mount and your desktop edge is up to 2.6 inches (66 mm) thick.2
- You want a monitor arm that reaches up to 25 inches (64 cm) of extension.2
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- You want a long stated warranty term (10 years).2
Don't buy this if
- You use monitors bigger than 27 inches: it holds two screens up to 27 in size.2
- You want stacked monitors: it is built for a side-by-side setup.2
- Your monitors are under 7 lb or over 20 lb each: each arm is rated for 7-20 lb.2
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- You need to mount a laptop without add-ons: laptop support needs the LX Notebook Tray accessory.2
At a glance
Why people choose it
- Holds two screens up to 27 inches.
- Extends screens out up to 25 inches (64 cm).
- Uses Constant Force motion technology for height adjustment.
- Passes a 10,000-cycle motion test on the lift mechanism.
- Fits VESA 75 x 75 mm and 100 x 100 mm patterns.
About this accessory
Ergotron LX Dual Side-by-Side Arm with 2-piece clamp is a dual monitor desk mount for side-by-side setups.
Read the full description
- Monitor size: Up to 27 in (per display)
- Weight capacity: 7-20 lb (per arm)
- VESA compatibility: 75 x 75 mm, 100 x 100 mm (MIS-D)
- Motion type: Constant Force motion technology
- Extension: Up to 25 in
- Desk attachment: Edge clamp
- Clamp capacity: Up to 2.6 in desk thickness
- Materials: Steel and aluminum
- Orientation note: Larger displays (23-27 in) are side-by-side only, not stacked
- Warranty: 10 years
- MPN: 45-491-216
- GTIN-14: 00698833058406
If you need a clamp for a desk edge up to 3 inches thick, this specific clamp spec (2.6 inches) is the limiting factor to check first.
How people use it
You are setting up a two-screen workstation where both displays need to move together, then tuck away. This side-by-side arm fits that workflow. It extends screens up to 25 inches and supports low-angle viewing, which is common for trading, support, and data review desks.
For compatibility checks, it supports typical 27-inch monitors that use VESA 75 x 75 mm or 100 x 100 mm and weigh 7-20 lb per screen. The desk clamp attaches to an edge up to 2.6 inches thick, so it is a skip if your desk is closer to a 3-inch thick edge.
If you want a laptop plus a monitor, plan on adding the LX Notebook Tray accessory.
Specifications
Dimensions, weight and build
| Monitor capacity | Holds two screens up to 27 in size | Ergotron spec |
|---|---|---|
| Monitor arrangement | Side-by-side | Ergotron spec |
| Compatible device | Other | Ergotron spec |
| Device interface | Other | Ergotron spec |
| Material | Metal | Ergotron spec |
| VESA mounting pattern | Other | Ergotron spec |
More details
| Brand | Ergotron |
|---|---|
| Color | White |
| GTIN-14 | 00698833058406 |
| Mount type | Desk clamp (2-piece clamp) |
| Warranty term | 10 years |
| Maximum extension | Up to 25 in (64 cm) |
| Durability testing | 10,000-cycle test applied to lift mechanism |
| Included in the box | Two arms, two extensions, pole, T-bracket, base, desk clamp |
| Laptop compatibility | Can be configured to hold a laptop with the LX Notebook Tray accessory (50-193-200) |
| VESA standards supported | VESA FDMI MIS-D (75 x 75 mm and 100 x 100 mm) |
| Alternative mounting option | Works with grommet mount accessory (98-035) for through-desk installation |
| Manufacturer Part Number (MPN) | 45-491-216 |
| Weight capacity per monitor arm | 7-20 lb (3.2-9.1 kg) |
| Desk thickness supported (clamp) | Up to 2.6 in (66 mm) |
How we checked it
Checked: Brand spec · GTIN on fileShow details
- Brand spec
- ergotron.com
- Identifiers
- GTIN 00698833058406 · MPN 45-491-216
- What we don't know yet
- The source page does not state tilt, swivel, or rotation angle ranges for this specific dual arm configuration.
What the evidence says
Ergotron product page: LX Dual Side-by-Side Arm (white)
Find your best view, save desk space and discover your most productive self, thanks to this LX Arm. This dual monitor mount is perfect for side-by-side or low angle views. Project wrapped up? Reclaim a space full of opportunities by folding the arms and pushing them aside during a much-needed screen break.
Source: Ergotron · retrieved Oct 28, 2026
Questions before you buy
What makes this arm a true gas-spring mount?
The Ergotron LX Dual Side-by-Side Arm uses Constant Force motion technology for smooth, counterbalanced adjustment. That mechanism is the gas-spring style most shoppers mean when they ask for a gas-spring arm, rather than a purely manual friction-only arm. The version sold by goodshelf is designed for frequent repositioning and is tested to 10,000 motion cycles.
How thick can my desk be for the clamp?
The included desk clamp fits desk edges up to 2.6 inches (66 mm) thick. If you need a through-desk install instead of an edge clamp, a grommet mount accessory is available for this arm. The Ergotron LX Dual Side-by-Side Arm is sold by goodshelf with the desk clamp included.
What monitor sizes and weights does it support?
The Ergotron LX Dual Side-by-Side Arm supports two monitors up to 27 inches, with a per-monitor weight range of 7-20 lb (3.2-9.1 kg). Monitor depth can affect capacity, and Ergotron notes that displays deeper than 3.5 inches (8.9 cm) may diminish the supported weight. If your monitors sit near the top of that range, confirm each monitor's weight without its stand.
Which VESA patterns work with this mount?
The Ergotron LX Dual Side-by-Side Arm supports VESA MIS-D mounting patterns of 75 x 75 mm and 100 x 100 mm. Those two patterns cover many common 27-inch monitors, but you should confirm your monitor has one of those hole patterns on the back. The unit sold by goodshelf is a VESA Mount Standard compliant monitor mount.
How far does it extend, and what does that change?
The arm extends the displays out up to 25 inches (64 cm). That reach helps you pull screens closer for focused work, then push them back to open desk space when you are done. The Ergotron LX Dual Side-by-Side Arm available from goodshelf can also fold the arms and move them aside for a clearer work surface.
What should I know about stacking vs side-by-side?
This model is built for side-by-side or low-angle dual-screen setups, not vertical stacking for larger screens. Ergotron notes that larger displays, such as 23-27 inch, cannot be positioned in a stacked orientation on this arm and can only be placed side by side. If your goal is a stacked layout, you should choose a different configuration than the side-by-side arm sold by goodshelf.
What comes in the box with this dual arm?
The kit includes two arms, two extensions, a pole, a T-bracket, a base, and a desk clamp. That is enough to mount two VESA-compatible monitors without buying extra structural parts. The Ergotron LX Dual Side-by-Side Arm sold by goodshelf is a complete mounting kit for a standard desk-edge clamp setup.
How does it handle cable management on a dual setup?
The Ergotron LX Dual Side-by-Side Arm is designed to route cables along the arm structure to reduce desk clutter. Keeping cables managed matters more on a dual-monitor mount because both screens move, and loose slack can snag during adjustments. If you plan frequent repositioning, leave enough service loop for tilt and extension across the full 25 inch reach.
Can I mount a laptop instead of one monitor?
Yes, the Ergotron LX Dual Side-by-Side Arm can be configured to hold a laptop in place of an LCD when used with the LX Notebook Tray accessory. This is a common way to run one external monitor plus one laptop screen while keeping both at ergonomic height. The arm itself, sold by goodshelf, ships as a dual monitor mount, the notebook tray is a separate accessory.
What materials is the arm made from?
The Ergotron LX Dual Side-by-Side Arm uses steel and aluminum construction. That material mix is meant to hold up under repeated movement and the specified 7-20 lb per-monitor load range. This is the same metal build you receive when buying the arm through goodshelf.
What durability and warranty coverage does it have?
The arm is tested to a 10,000-cycle motion test on the lift mechanism, which is meant to support years of height adjustment. It also includes a 10-year warranty from Ergotron. If long service life matters for shared workstations, the Ergotron LX Dual Side-by-Side Arm sold by goodshelf is built and warrantied for sustained use.
What do the sustainability and air-quality marks mean here?
This arm is listed as BIFMA level 2 for sustainability and Clean Air GOLD certified, and it is noted as compliant with ANSI/BIFMA indoor air quality standards for VOC emissions. These marks relate to material and emissions standards, not monitor compatibility. If you are outfitting an office with indoor air requirements, the Ergotron LX Dual Side-by-Side Arm available from goodshelf includes these certifications.