Product Overview
The Ergotron 45-491-216 LX Dual Side-by-Side Arm is a white dual-monitor desk mounting system designed to position two compatible LCD monitors side by side. It combines two articulated monitor arms with a central pole and desk clamp, allowing users to adjust screen height, angle, and orientation while freeing up valuable desk space.
Part of Ergotron's LX monitor arm series, this mounting system uses Constant Force motion technology to support smooth display repositioning. Its articulated design allows both monitors to be moved independently within the limits of the arm configuration, making it suitable for workstations that require multiple screens and flexible viewing arrangements.
Dual-Monitor Positioning
The two articulated arms allow users to adjust monitor height, viewing angle, horizontal position, and screen orientation. The displays can be arranged side by side or repositioned for alternative viewing configurations, subject to available workspace and mounting clearances.
The system provides up to 13 inches (33 cm) of height adjustment and extends displays up to 25 inches (64 cm). Each screen can also rotate between landscape and portrait orientations when supported by the monitor and mounting configuration.
Monitor Compatibility and Weight Capacity
The LX Dual Side-by-Side Arm is designed for two compatible LCD monitors, typically up to 27 inches each. The supported weight range is 7–20 lb (3.2–9.1 kg) per monitor, with a maximum combined load of 40 lb (18.1 kg).
Both monitors must have compatible VESA mounting interfaces. The arm supports VESA MIS-D mounting patterns of 75 x 75 mm and 100 x 100 mm. Actual compatibility depends on each monitor's weight, mounting pattern, physical dimensions, and the clearance required for the two screens to move.
Desk Mounting and Cable Management
The included two-piece desk clamp attaches the mounting system to a compatible desk edge. The central pole supports both articulated arms, creating a shared mounting arrangement for the two displays.
Integrated cable management routes monitor cables beneath the arms to help organize connections and reduce cable clutter around the workstation.
Key Features
- Dual-screen configuration: Supports two compatible monitors in a side-by-side arrangement.
- Constant Force motion technology: Supports smooth monitor repositioning without conventional adjustment knobs or levers.
- Flexible positioning: Provides 13 inches of lift, up to 75 degrees of tilt, 360-degree pan, and 360-degree screen rotation.
- Extended reach: Allows displays to extend up to 25 inches from the mounting pole.
- Integrated cable management: Routes cables beneath the arms to help maintain an organized workspace.
Applications
This dual-monitor mounting system is suitable for office workstations, administrative desks, software development environments, data analysis workstations, and other settings where two screens are used simultaneously. The ability to reposition each display can help users arrange applications, documents, and reference material according to their workflow.
DC Supplies Product Note
When planning a two-monitor installation, check the weight of each display individually as well as the combined weight. Each monitor must fall within the specified 7–20 lb range, and the total supported load must not exceed 40 lb. The white version includes a two-piece desk clamp; the white grommet mounting accessory kit, part number 98-035, is available separately for compatible through-desk installations.
Technical Specifications
| Brand | Ergotron |
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| Part Number / MPN | 45-491-216 |
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| Product Type | Dual-monitor desk mounting arm |
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| Product Series | LX |
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| Model | LX Dual Side-by-Side Arm |
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| Color | White |
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| Supported Displays | 2 LCD monitors |
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| Typical Monitor Size | Up to 27 inches per monitor |
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| Weight Capacity per Monitor | 7–20 lb (3.2–9.1 kg) |
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| Maximum Combined Weight | 40 lb (18.1 kg) |
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| Height Adjustment | 13 inches (33 cm) |
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| Tilt Range | 75 degrees total: 70 degrees upward and 5 degrees downward |
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| Pan | 360 degrees |
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| Screen Rotation | 360 degrees |
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| Maximum Extension | 25 inches (64 cm) |
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| VESA Compatibility | MIS-D, 75 x 75 mm and 100 x 100 mm |
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| Mounting Type | Desk edge clamp |
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| Motion Technology | Constant Force |
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| Cable Management | Integrated cable routing beneath the arms |
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| Included Components | Two monitor arms, two extensions, central pole, and two-piece desk clamp |
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| Optional Mounting Accessory | White grommet mount accessory kit, part number 98-035, sold separately |
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| Warranty | 10 years |
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| GTIN / UPC | 00698833058406 |
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Frequently Asked Questions
1. How many monitors does the Ergotron 45-491-216 support?
This mounting system supports two compatible LCD monitors arranged side by side. Each display attaches to its own articulated arm.
2. What is the maximum supported weight?
Each monitor must weigh between 7 and 20 lb (3.2–9.1 kg). The maximum combined weight of both monitors is 40 lb (18.1 kg).
3. Can the monitors be rotated into portrait orientation?
Yes. The arms support 360-degree screen rotation, allowing compatible monitors to be positioned in portrait or landscape orientation.
4. Does this model include a grommet mounting kit?
The 45-491-216 package includes a two-piece desk clamp. The white grommet mount accessory kit, part number 98-035, is available separately.
5. Which VESA mounting patterns are supported?
The mounting system supports VESA MIS-D patterns of 75 x 75 mm and 100 x 100 mm. Check the mounting interface of both monitors before installation.
6. Does the mounting system help manage monitor cables?
Yes. Integrated cable management routes cables beneath the articulated arms to help keep the workstation organized.
