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Humanscale 400 Diagonal Big Board Keyboard Tray

$150.00 $95.00
(You save $55.00)
Usually Ships within 72 Hours

Product Description

A key component of an ergonomic workstation and a must for any keyboard user, a well-designed articulating keyboard support offers serious protection from carpal tunnel syndrome, neck and back pain, and other musculoskeletal issues.


Humanscale offers award-winning,negative-tilt mechanism options, from our original standard bearer, to our latest 5G, which combines easy dial-a-tilt and height adjustability with the strongest, most stable arm on the market. All mechanisms encourage low-risk typing postures and feature easy and intuitive adjustability.

Features & Specifications:

  • Different mechanisms to choose from that offer various functions such as height adjustability and dial-a-tilt capabilities
  • Comes with built-in mousing surface
  • Available in 7 different track lengths ranging from 11" to 25" dependant on your desk solution
  • Made of 1⁄4” phenolic resin, which combines strength, durability and a slim profile
  • Large platform surface
  • Intuitive height adjustment that requires no locks, levers or controls Dial-a-tilt positioning that allows you to type at the angle most comfortable for you
  • Ultra-thin profile to provide maximum knee clearance
  • Superior design to provide maximum strength and stability yet extremely lightweight
  • Raised tilt mechanism to protect the keyboard from collisions with the edge of the desk
  • Available in Black. ** Other options are available please call for more information.


 Recommended Keyboard Mechanism Options:

* Other keyboard mechanisms are available. Please contact us for more information.

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6G Keyboard Mechanism (Black) - $169.00

  • Height adjustment range: 7”
  • Tilt adjustment range: 0o to -15o
  • Weight: 6.5 pounds
  • Exceeds all BIFMA standards
  • Made primarily of powder-coated steel
  • 15-year 24/7 warranty



5G Keyboard Mechanism (Black) - $169.00

  • Height adjustment range: 6.25”
  • Tilt adjustment range: 0o to -15o
  • Weight: 8.5 pounds
  • Exceeds all BIFMA standards
  • Made primarily of powder-coated steel
  • 15-year 24/7 warranty

5G Short Mechanism (Black) - $169.00

  • Height adjustment range: 4”
  • Tilt adjustment range: 0o to -15o
  • Exceeds all BIFMA standards
  • Made primarily of powder-coated steel
  • 15-year 24/7 warranty




5G Above-Desk Mechanism (Black) - $209.00

  • Height adjustment range: 13.5”
  • Tilt adjustment range: 0o to -15o
  • Exceeds all BIFMA standards
  • Made primarily of powder-coated steel
  • 15-year 24/7 warranty


Palm Support:

When it comes to support we have options for you. The humanscale palm support suitable for the 400 board can range from as slim as 7" to 27" full palm support. For this particular large diagional keyboard we suggest either the 19" Gel Support, 20" Gel Support. 27" Gel Support.

Corner Sleeve Options:

Corner sleeves assist  in maximizing the amount of desk space by turning a 90 degree desktop corner into a diagional corner.

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DE100 + $89.00

29.5” x 12.188”
Fits desks 1” to 1.5” thick


DE200/DE250 + $55.00

16” diameter
fits desks 1” to 1.5” thick
fits desks 1.5” to 2.5” thick




Quick Links to Answers:

How does free shipping work? What are my shipping options? Will my item come assembled? When can I expect my order? Do you ship to my country? My item arrived damaged, what do I do?

What is the handling charge for?

Track Your Package

Free Shipping Program

Most orders over $85 ship FREE within the continental United States. Shipments to Alaska, Hawaii, Canada, Mexico, U.S. territories, APO, and FPO addresses do not qualify for the free shipping program.

Exceptions for Canada - Some products do qualify for free Canadian shipping. Please see our International Shipping page for full information.

General Shipping Information:

  • Most items ship via UPS Ground service. Some smaller items may be shipped via USPS instead. Desks and larger shipments may ship via a freight carrier.
  • If your items ships via common carrier (freight), the freight carrier will call to schedule an appointment for delivery. Our standard/free shipping includes curbside delivery. There may be extra fees for liftgate (lowers the product to the ground), residential, or inside delivery. Call us for more information. Note: It is important for you to immediately inspect freight shipments for damage and to note this on receiving paperwork. Call us immediately if your product arrives with shipping damage.
  • UPS and freight are not available to APO and FPO addresses. Call us if you have questions on shipping options to your location.
  • UPS items do not usually require a signature for delivery but this is at the discretion of the driver. Signature may be required in high risk areas.
  • We will email you an estimated ship date, and tracking information as soon as this is available.

Will My Item Come Assembled?

This will vary by item. Most furniture items require assembly. This is usually easy to do. Contact us if you need support. Assembly and white glove delivery is available for furniture items. Please contact us for a quote.

When Can I Expect My Order?

Every product lists an expected time before shipment. Most small items ship the same or next day. Keyboard trays, monitor arms, chairs, and desks are usually custom configured items that are built to order. Lead times vary by product and manufacturer. Travel time varies depending on shipping method chosen, warehouse location, and your location. If timing is critical, please call us and we'll recommend the method most likely to arrive on time. International orders may encounter delays due to incoming customs.

Do You Ship to My Country?

We do ship most items worldwide. Please see our International Shipping page for full information

My Item Arrived Damaged, What Do I Do?

  • Call or email us immediately. Under most circumstances, we will replace the damaged item at no cost to you. Please see our returns page for full information before returning product.
  • If your item was delivered via a freight carrier, it is important that you inspect it immediately and note any visible damage on the receiving paperwork the freight carrier will ask you to sign. Please sign after inspection.

Handling Charges - Canada & APO

Handling Charges: In order to deliver your products timely, a flat handling charge of $12.95 is applied to all orders shipping to Canada and APO addresses.. Special handling charges are in addition to applicable shipping rates. Surcharges always apply regardless of free shipping offers.

The shipping and handling charge is intended to compensate Ergoprise for the cost of handling your order, packaging the product(s) you have purchased, and delivering it/them to you or to the recipient you designate. Prior to submitting your payment information, you will have the opportunity to review the applicable shipping and handling charges. We do not ship orders to FPO or P.O. Boxes. Please avoid using "vanity addresses," as this could result in a delay in delivery.

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