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Humanscale 4G Mechanism Adjustable Arm DISCONTINUED SPECIAL ORDER REPLACED BY 5G

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Promo expires November 1, 2021
Product ID: 13640
List Price: $375.00
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Our Price: $239.00
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Humanscale 4G Adjustable Arm Mechanism

Humanscale 4G Adjustable Arm Mechanism

  Diagram of Humanscale 4G Adjustable Arm Mechanism





Humanscale 4G offers simple, dial-a-tilt adjustability and intuitive height adjustment in a sleek package. It is also very popular.


The 4G offers all the advantages of the 2G, but
with simple dial-a-tilt keyboard angle adjustability.


Humanscale 4G Mechanism Features (Adjustable Keyboard Arm)

  • Intuitive, knob-free height adjustment (6 1/4” range from 5” below the mount to 1 1/4” above the mount)
  • Easy, dial-a-tilt platform tilt adjustment from 0° to -15° for safe keying
  • 22” track allows the unit to slide fully under the desk for storage, or all the way out for complete access
  • Base 360° swivel
  • Standard Track Length 21 3/4"
  • Track width 5 3/8"
  • Alternate Track Lengths 16” and 18"
  • End of Track to Beginning of Platform 6"
  • Max Depth Below Bottom of Keyboard 1/2"
  • Unmatched stability for sure keying and mousing
  • Made of steel for strength and durability
  • Lifetime Warranty




The Neutral Reach Zone is the area that can be conveniently reached with a sweep of the forearm while the upper arm hangs in a natural position at the side.” (Sanders & McCormick, 1993)

Unlike older generation keyboard/mouse solutions, our platforms are designed to ensure that nearly all users are able to work consistently within their Neutral Reach Zone, and thus maintain a low-risk, sustainable posture.

Neutral Reach Zone

Installation Information:

All keyboard platforms need adjustable arm installed under the desktop or table. In order to install adjustable arm with standard track, the desk or table must be at least 22." deep. The undersurface must be flat and free of drawers, structural supports and other obstructions. A 22" track will be directly mounted to the underside of the desk or table with ten 3/4" screws, so the undersurface must be able to accept wood screws.

You might install a shorter track (18" or 16" ) If your desk is less than 22" deep. In that case your keyboard tray might not retrieve all the way under the desktop.

An arm with shorter track (18" or 16") is capable of handling all ergonomic functions such as bringing the keyboard tray up or down, in and out, swivel to left and right and provide negative tilt.

Please call 650-654-4300 or 888-456-ERGO (3746) and ask a technician to explain the details of the products for you.


Click Here for detailed installation instructions of the Humanscale keyboard system

Hyperlink of detailed installation instructions of the Humanscale keyboard system



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Model 4G
Manufacturer Humanscale
Part Number 4G

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Humanscale 4G Mechanism Adjustable Arm DISCONTINUED SPECIAL ORDER REPLACED BY 5G

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