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Two matte-black monitor arms stacked on a tall pole with desk clamp and grommet hardware

Ergotron

Ergotron 45-509-224 LX Dual Stacking Arm Tall Pole Matte Black monitor accessory

SKU CH-ZVD0-N1ES5 MPN 45-509-224

Stacks two monitors on a 23" pole with 13" height range and Constant Force adjustment

  • Product typeMount
  • Product colorBlack
  • Key featuresPositions monitors for maximum comfort with unparalleled ran
  • Product weight19 lb (8.62 kg)
  • Positions monitors for maximum comfort with unparalleled range of motion
  • Helps reduce eye, back and neck strain with 13" (33 cm) height adjustment
  • Patented Constant Force technology allows easy display positioning
  • Foldable arms free up space in tight areas
  • Includes desk clamp for surfaces up to 2.6" (66 mm) thick and grommet mount for holes 0.31" to 2" (8-50 mm) wide

Dual Stacking Arm For Two Monitors

The Ergotron 45-509-224 LX Dual Stacking Arm mounts two displays on a single 23" tall pole. It includes two LX arms with extensions, a heavy-duty two-piece desk clamp with dual screws, two pole collars, two caps, a grommet mount plate and all monitor mounting hardware. The matte black finish suits professional workspaces. VESA FDMI MIS-D 100/75 C compliance covers 100 x 100 mm and 75 x 75 mm hole patterns.

Height Adjustment And Desk Mounting

The arm provides 13" (33 cm) of height adjustment to help reduce eye, back and neck strain. Patented Constant Force technology allows easy positioning of displays while the foldable arms free up space in tight areas. The desk clamp attaches to surface edges up to 2.6" (66 mm) thick. The grommet mount fits holes from .31" to 2" (8-50 mm) wide in surfaces up to 3" (76 mm) thick.

Maximum Display Dimensions For Stacking

To stack monitors vertically, the maximum outside height of each display should be no more than 21" (53 cm). For side-by-side alignment, the maximum outside width should not exceed 40" (102 cm). Most monitors with screen sizes of 40" or less fit within these specifications. Buyers with larger displays or ultra-wide panels beyond 40" width cannot use this arm for dual mounting.

How it compares

Measured against everything we stock in Monitor Mounts & Display Accessories, at today’s prices. Recalculated every night.

Price $344.99
Pricier than about 91% of the 10,638 comparable items (median $42.99).

Specifications

Product
Brand nameErgotron
Model name45-509-224
Product typeMount
Product colorBlack
Size & build
Product weight19 lb (8.62 kg)
Shipping weight10.89 kg
Package size759 × 450 × 434 mm

Questions about this item

How do I attach the 23" tall pole to a desk edge, and what step do people miss?

Clamp the heavy-duty two-piece base to a surface up to 2.6" thick using both screws; the step often missed is tightening the second screw fully so the pole cannot rotate.

What part will need replacement after years of daily height changes?

The patented Constant Force spring mechanism inside each arm maintains the 13" lift; if it loses tension, the arm assembly is the serviceable unit.

At what monitor height does the stack become unstable on the 23" pole?

The manufacturer specifies a maximum outside display height of 21" (53 cm); exceeding this limit makes the top monitor prone to tipping during adjustment.

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