Ergotron
Ergotron HX Desk Mount Arm (45-647-026)
Overview
The Ergotron HX Desk Mount Arm (45-647-026) is the heavy-duty companion to the legendary LX, designed specifically for ultrawide and large-format monitors weighing up to 42 lbs (19.1 kg). It supports displays up to 49 inches diagonal including the Samsung Odyssey G9 and Dell UltraSharp U4919DW. The HX features an upgraded gas-spring piston that provides smooth one-finger lift even at maximum load, a reinforced pole base, and the same 10-year warranty that makes Ergotron the gold standard in monitor arms. Available in black and white finishes.
Key Highlights
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Heavy-duty design supporting monitors up to 42 lbs (19.1 kg) — purpose-built for ultrawide and large-format displays up to 49 inches
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14 inches (356 mm) of smooth vertical lift with upgraded gas spring piston for heavy displays — tool-less height adjustment
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Full range of motion: 360° pan at the pole, 360° rotation at the VESA head, 80° forward tilt, 20° backward tilt, and portrait/landscape switching
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Two mounting options: desk-edge clamp (fits desks up to 2.25" / 57 mm) and grommet mount — both included in the box
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10-year warranty — same legendary durability as the LX but engineered for the extreme weight of modern super-ultrawide monitors
Technical Specifications
| Brand | Ergotron |
| Model | Ergotron HX Desk Mount Arm (45-647-026) |
| Weight Capacity | Up to 42 lbs (19.1 kg) |
| VESA Compatibility | 75×75 mm and 100×100 mm (adapter plate may be needed for non-standard patterns) |
| Max Monitor Size | 49 inches diagonal (ultrawide and super-ultrawide) |
| Arm Reach | 14 inches (356 mm) from pole center to VESA plate |
| Vertical Range | 14 inches (356 mm) along the pole |
| Tilt Range | 80° forward / 20° backward |
| Mount Types | Desk-edge clamp (up to 2.25" / 57 mm thick) and grommet mount (up to 2.5" / 64 mm hole) |
| Dimensions | 381 x 178 x 127 mm (15.0 x 7.0 x 5.0 in) — package; installed reach: 356 mm (14 in) from pole center to VESA plate |