LX Sit-Stand Laptop Desk Mount Arm, ED-NB-55DM

The minimum weight of the laptop must be at least 6 lbs. 

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Product ID: 18582
  • Desk mount laptop arm
  • Unique design of the laptop/tablet holder
  • Grips your laptop or tablet securely but with a quick attach and release
  • Adjustable clasps allow for free access to all ports
  • Arm provides 20" height adjustment - sit-stand ability
  • Arm provides 33" horizontal extension
  • If your laptop is too light, add weight adapter plate (Option #1) 
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Our Price: $359.00
Shipping: $24.95 *
* applies to Contiguous United States


This versatile arm can be used in a variety of applications: attach a smaller monitor for use within a sit-stand workstation or position a large display up to 25 lbs (11.3 kg) wherever you want it. The LX provides unparalleled range of motion, being able to accommodate a user’s sitting or standing posture - features 20" (51 cm) of vertical adjustment and 62" (157 cm) of side-to-side adjustment.

Add Notebook Tray accessory to an LCD arm, pivot or workstation and position your notebook computer where you need it most. Works with a traditional laptop or with a convertible notebook, in either tablet or laptop mode.


Technical Drawing

Sit-Stand Desk Mount Arm

Technical drawing for Ergotron 45-360-026 LX Sit-Stand Desk Mount LCD Arm


Laptop Holder

Technical Drawing for Innovative EVO-5501 Tablet PC or Notebook Holder


Technical Specifications

Sit-Stand Desk Mount Arm













7-25 lbs

3.2-11.3 kg


51 cm






Notebook Holder

Minimum Width

10.5" (26.7 cm)


9.1" (23.1 cm)

Length with Clips

  • 0.6" (1.5 cm)
  • 0.9" (2.3 cm) Minimum
  • 1.8" (4.6 cm)
  • 2.1" (5.3 cm) Maximum


Tablet PCs and Laptops


Product Information


LX Sit-Stand Desk Mount LCD Arm (polished aluminum)


  • LX sit-stand arm

  • Extension

  • Desk clamp base

  • Grommet-mount base

  • 48 cm pole

  • VESA brackets

Quality Tested

10,000-cycle test applied to lift mechanism, ensuring years of trouble-free height adjustment

Weight Capacity

7 to 25 lbs (3.1 to 11.3 kg). Monitor depth may affect weight capacity

Monitor Tilts

70° up and 5° down

Mounting Standards

  • VESA MIS-D, 75/100 (hole pattern = 100 x 100 mm & 75 x 75 mm), MIS-E (hole pattern = 200 x 100 mm), MIS-F (hole pattern = 200 x 200 mm ONLY).

  • Optional VESA Bracket Adaptor Kit (97-759) can be ordered separately for MIS-F interface with hole pattern of 400 x 200 mm, 400 x 300 mm or 400 x 400 mm

Locking Connections

Between arm, extension and base offer increased theft deterrence and prevent potential disconnections caused by jarring or impacts

Desk Clamp

Attaches to edge up to 2.5" (65 mm) thick; grommet mount attaches through hole 0.5" to 2.5" (7–65 mm) wide and up to 2.5" (65 mm) thick

Cable Management Clips

On the under side of the arm route and hide cords

Keyboard Arm

To add an LX Sit-Stand Keyboard Arm to the configuration, order 45-354-026. Attach keyboard arm at base of pole while leaving the arm’s wall-mount base unused


Computer systems mounted on this product may require extra long USB, power or video cables in order to span between standing and sitting heights

Product Weight

19.5 lbs (8.9 kg)

Shipping Dimensions

25" x 14.75" x 7.5" (64 x 38 x 19 cm)

Shipping Weight

22 lbs (10 kg)


Ten (10) years



  • 20-inch (51 cm) height range allows users to move between sitting and standing positions while they interact with the display

  • Extends LCD up to 33" (84 cm); push your display out of the way when not in use

  • Increase viewing comfort - help reduce eye, back and neck strain

  • Upgrade LCD monitors and TVs with improved ergonomic adjustment

  • Patented CF motion technology provides premium ease-of-use adjustment

  • Cable management clips on the under side of the arm route and hide cords

  • Ideal for space-constrained spaces - folds to within 4.5" (12 cm) of back of desk in storage position

  • Secure installation - locking connections between arm, extension and base

  • Passes Ergotron’s 10,000-cycle motion test, which ensures years of trouble-free height adjustment



  • Adapts to support both tablet PCs and laptops

  • Securely grips tablet or laptop, with quick attach and release

  • Adjustable clasps allow free access to jacks and ports

  • When used with tablet PCs, enables one-handed use of the tablet

  • Allows tablet to be used in portrait or landscape position

  • Mounting arm floats computer above desk - simply grab and move to desired position

  • Arm extends up to 18", with vertical adjustment of +/- 5" from horizontal

  • Integrated cable management keeps cords off the desk

  • Mount clamps to desk or through grommet with integrated handle (may also combine with slatwall, slat rail or wall mount)



Model ED-NB-55DM
Manufacturer Ergodirect
Part Number ED-NB-55DM
Color Arm: Polished aluminum, Laptop: Black
Weight Capacity 7–25 lbs (3.2–11.3 kg)
Vertical Range 20" (51 cm)
Horizontal Range 33" (84 cm)
Tilt 75 degree
Pan 360 degree
Rotation 360 degree
Monitor Arm Types Laptop/Notebook
Mounting Options Desk

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LX Sit-Stand Laptop Desk Mount Arm, ED-NB-55DM

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