Ergotron – LX Monitor Arm Extension – Add-on for LX Desk and LX Wall Monitor Arms, LX Keyboard Arm – Polished Aluminum

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Bottom line: The Ergotron – LX Monitor Arm Extension – Add-on for LX Desk and LX Wall: Adds 9 inches of reach to an existing LX Desk, LX Wall, or LX Keyboard Arm; main trade-off: adding the extension may reduce the arm's rated weight capacity.

Unavailable on Amazon as of 2026-10-06 22:26 UTC

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By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-06

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Pros & Cons

Pros

✓ Adds 9 inches of reach to an existing LX Desk, LX Wall, or LX Keyboard Arm
✓ Extra pivot point widens the adjustment range, not just the distance
✓ 10-year Ergotron warranty, same coverage as the LX arms themselves
✓ Internal cable routing keeps the added length from adding desk clutter

Cons

✗ Adding the extension may reduce the arm's rated weight capacity
✗ Not recommended by Ergotron for use with LX Dual Arms
✗ Only fits LX arms - no use with other mount families
✗ Add-on only; useless unless you already own a compatible LX arm

Manufacturer description

The Ergotron LX Monitor Arm Extension adds 9 inches of reach to an LX arm you already own, turning a single-pivot setup into something that can swing across a wider desk or reach a second seating position. It bolts onto the LX Desk Arm (45-241-026), LX Wall Arm (45-243-026), or LX Keyboard Arm (45-246-026), and the extra pivot point it introduces widens your adjustment range rather than just pushing the display further out. Installation is a one-piece job: the kit ships with the 9-inch extension and an end cap, and the aluminum housing routes cables underneath the arm so the added length…

SpecPicks Verdict

SpecPicks scored Ergotron – LX Monitor Arm Extension – Add-on for LX Desk and LX Wall… using a rating × review-volume × price-fit model applied to published specs and reviews across the home & kitchen category. Compare with similarly-priced alternatives in the home & kitchen category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for home & kitchen of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Which Ergotron arms does this extension fit?

It fits the LX Desk Arm (45-241-026), LX Wall Arm (45-243-026), and LX Keyboard Arm (45-246-026). Ergotron does not recommend it for LX Dual Arms.

How much extra reach does it actually add?

Nine inches. It is a single 9-inch extension segment plus an end cap, installed between your existing arm sections.

Will adding this reduce how much weight my arm can hold?

Ergotron states that adding an extension may reduce the arm's weight capacity. Check your specific LX arm's listed capacity before mounting a heavier display.

Can I install a second extension on the same arm?

Ergotron describes this as adding one extension to an existing LX Arm. Check the product listing or contact Ergotron technical support before stacking more than one.

Is it covered by a warranty?

Yes. Ergotron lists a 10-year warranty with technical support on this extension, matching the coverage on the LX arm line.

Key Features

Compatible with LX Arms: Upgrade your LX Desk Arm (45-241-026), LX Wall Arm (45-243-026) or LX Keyboard Arm (45-246-026) with a second extension to increase its reach an additional 9 inches; adding extension may reduce weight capacity; not recommended for use with LX Dual Arms
Simple installation: Easily and quickly add one extension to an existing LX Arm; includes 9-inch extension and end cap
Extra flexibility: Another pivot point allows for a wide range of adjustment, expanding use for a broader variety of individuals and applications
Neat workspace: Streamlined design accentuates any work area and clean cable management routes cables under the arm and out of the way
Built to last: Extensive quality testing ensures your display stays stable and secure; Ergotron products set the standard for quality with a 10-year warranty and expert technical support

Full Specifications

Brand	Ergotron
Color	Polished Aluminum
Material	Aluminum
Model Number	45-289-026
Mounting Type	Tabletop Mount
Movement Type	Articulating
Built-In Media	Ergotron mounting component
Item Type Name	Ergotron LX Extension - Mounting Component (extension brackets)
Neat workspace	Streamlined design accentuates any work area and clean cable management routes cables under the arm and out of the way
Mfr Part Number	45-289-026
Item Part Number	45289026
Extra flexibility	Another pivot point allows for a wide range of adjustment, expanding use for a broader variety of individuals and applications
Compatible Devices	Monitor
Enclosure Material	Aluminum
Simple installation	Easily and quickly add one extension to an existing LX Arm; includes 9-inch extension and end cap
Warranty Description	5 years limited warranty
Maximum-Supported Screen Size	24 Inches
Minimum-Supported Screen Size	15 Inches
Global Trade Identification Number	00698833020052, 04054317514343
EU Spare Part Availability Duration	10 Years

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