Humanscale 600 Extender Keyboard Tray - Design Your Own (Discontinued)

The Humanscale 600 is easily configured to meet specific needs, letting you type and mouse in better comfort

Effective 11/15/2021, Humanscale will require a signature upon delivery for all FedEx shipments.

The Humanscale 600 Extender Keyboard Tray has been discontinued. For a similar product, please visit our sister site and view the Keyboard Tray System Builder page.

When you work on a corner desk, you need a keyboard setup that works with you, not against you. Try the Humanscale 600 Extender Keyboard Tray for more comfortable typing within your Neutral Reach Zone and feel the difference.

The Humanscale 600 platform design supports nearly all standard keyboards and fits perfectly into a 90° or sharply radiused corner, letting users of trickier desk configurations build the desk of their dreams. 

Select the mechanism, mouse platform, palm support, and other customizable options to suit your particular needs with our Design Your Own option.


  • Easily configured to meet your specific needs 
  • Offers the deepest single surface from Humanscale for a keyboard tray
  • The keyboard platform is made of phenolic - an ultra-strong, remarkably thin (1/4") composite that's nontoxic, durable, and easy to clean
  • The platform design works with all the mousing platforms options available and will fit most desks, including corner desks


Mechanisms 9 adjustable arms available
Track lengths 11" - 27" for varying desk depths
Mousing surface 13 clip-on and swivel options
Palm rests Available in foam or gel
600 platform dimensions 19" W x 14.75" D
Warranty 15 years


The Humanscale 600 Extender Keyboard Tray is only available in Black.


Humanscale Keyboard Mechanisms

2G mechanism

Loosen knob to adjust and lock back into place. Unlike the 5G or 6G, this mechanism has no reference for keyboard platform angle.

Height adjustment 6.25": 1.25" above track to 5" below track
Track length Comes standard with 22" track

6G mechanism

Humanscale's newest dial-a-tilt mechanism that instantly adjusts the platform's tilt without the need to lock or loosen any knobs or levers and slimmer than the 5G.

Height adjustment 7": 1.75" above track to 5.25" below track
Track length Comes standard with 22" track

5G mechanism

The dial-a-tilt mechanism instantly adjusts the platform's tilt without the need to lock or loosen any knobs or levers. Its solid build quality and simplicity make this mechanism the most popular mechanism Humanscale offers.

Height adjustment 6.25": 1.25" above track to 5" below track
Track length Comes standard with 22" track

5GSM mechanism for limited-depth desks

This mechanism goes 4" farther underneath a desk surface, getting a keyboard tray stored out of the way on a shorter track, perfect for desks with limited depth or small spaces.

Height adjustment 4": 0.5" above track to 3.5" below track
Track length Comes standard with 18" track

AD mechanism

This mechanism is the 2G mechanism, but with a longer arm for use above a work surface. It works well for sit-to-stand solutions.

Height adjustment 10'': 5'' above track to 5'' below track
Track length Comes standard with 25'' track
Humanscale AD Mechanism

KM mechanism

This mechanism features a pre-set 0 degree tilt and knob-free adjustment.

Height adjustment 6.25": 1.25" above track to 5" below track
Track length Comes standard with 22" track

Lateral Slider

All Humanscale mechanisms pivot 360 degrees from the point where it is mounted to the track. Some users have a need for additional side-to-side adjustability. The lateral slider provides for eight extra inches of movement from right to left. This is a useful feature for someone at a large workstation that requires them to type facing different angles or monitors.


Track Length

The track mounts to the underside of your work surface. It directs and supports the Humanscale mechanism and keyboard tray as it slides forward and back. Standard length on most mechanisms is 21 5/8 inches. That length ensures that the keyboard tray can be completely stowed under your desk when not in use. Some mechanisms come standard with a shorter or longer track. Consult each description for that information, but all systems can be ordered with any track length.


Mouse Platform

Clip Mouse - Mousing Platform

The clip mouse platform is the only mouse platform that allows the user total adjustment control in all three dimensions- height, depth, forward/back and tilt, allowing it to be adjusted precisely the way you need it. It also easily snaps onto either side of the tray for left or right use, and it's available in two sizes and different height ranges.

Note: The high clip has an extra one inch height for additional adjustment and usability and is the most popular accessory we sell.

90H 8.5'' diameter high
90 8.5'' diameter
91H 10'' diameter high
91 10'' diameter
90H90H 8.5'' diameter high - Dual platforms for left and right
91H91H 10'' diameter high - Dual platforms for left and right
Humanscale Clip Mouse Platform

Swivel Mouse - Mousing Platform

The swivel mouse mounts underneath either the left or right front corner of the platform. It swivels out from underneath the keyboard platform easily and tucks out of the way when not in use. This mouse platform is available in right, left and dual configurations. The main difference between the clip mouse and swivel mouse is the adjustability. The swivel platform stays on the same tilt or angle as the keyboard tray; the clip mouse angle can be adjusted independently.

11R 8'' swivel right
11L 8'' swivel left
11D 8'' swivel dual - Dual platforms for left and right
12R 10'' swivel right
12L 10'' swivel left
12D 10'' swivel dual - Dual platforms for left and right
Humanscale Swivel Mouse Platform

M2 Mouse - Mousing Platform

The M2 offers all the advantages of the swivel mouse, but it is slightly larger and offers a uniquely shaped platform. This lets a user bring the mousing surface closer to their body for a lower risk mousing position.

81R M2 right
81L M2 left
81D M2 dual - Dual platforms for left and right
Humanscale M2 Mouse Platform

Mouse Pad

The Humanscale 600 Extender Keyboard Tray can be ordered with a black mouse pad to fit any of the available mousing platforms.

8.5'' swivel platforms MPGEL8 8.5'' gel mouse pad
10'' swivel platforms MPGEL10 10'' gel mouse pad
90 or 90H clip platforms CMPGEL8 8.5'' gel mouse pad
91 or 91H clip platforms CMPGEL 10'' gel mouse pad

Second Mouse Pad

A second mouse pad can be ordered with the Humanscale 600 tray for configurations utilizing two mouse platforms.


Palm Support

Select from two different palm rest options for your Humanscale 600 Extender Keyboard Tray: foam or gel. Both are covered with an easy to clean, black synthetic leather. A slim gel palm rest with a black or silver synthetic leather cover is also available for users with thin keyboards. Slim palm rests are not compatible with swivel mouse platforms.

When designing your Humanscale 600 Extender Keyboard Tray, if you choose to not add a palm support, there will be holes located at the installation points on the tray.


Humanscale Palm Rests

This is normal and part of the keyboard tray's design, but if you do not want a palm rest and installation holes in your tray, we suggest ordering another keyboard tray.

If you have any questions or need help choosing a keyboard tray, please don't hesitate to call us!


Corner Sleeve

Increase the surface area when mounting your keyboard tray system in the corner by adding an optional corner sleeve. The Humanscale DE100 corner sleeve fits desks that are 1'' to 1.5'' thick.

Humanscale DE100 Corner Sleeve

Promotional Item

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This keyboard's split design promotes a more natural and ergonomic typing position.

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Clear up desktop space and keep your computer tower off the floor by mounting it to the underneath of your desktop. This accessory is great for height-adjustable desk users.


FREE UPLIFT Single Monitor Arm

Mount a monitor weighing between 4.5 lbs - 17.5 lbs, and adjust the height, depth or lateral position with easy fingertip adjustment.

UPLIFT Single Monitor Arm

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Warranty Policy

Visit Humanscale for the warranty policy for this particular product.

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