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Momentum sit-stand arm is a Knape and Vogt keyboard arm designed to support a sit-stand workstation using a single under-desk arm and tray assembly. The 21-3/4 inch sit-stand arm supports movement between seated and standing positions, so the same station can handle different working heights without changing the desktop. Lift-n-Lock height adjustment on this Momentum arm sets tray height by lifting and locking in place, which gives repeatable positioning when you go back to a preferred height during the day. The keyboard tray tilt adjustment uses a soft touch knob, so tilt is set with a simple knob turn instead of tools. This Knape and Vogt 8478D2101 model is part of Wurth Baer Supply's keyboard arms lineup, so it fits into a woodworking or shop install where ergonomic keyboard positioning is needed.
The 21-3/4 inch long glide storage track serves as the mounting base for this sit-stand keyboard arm, so the arm assembly runs along a fixed under-surface path. This track length defines the slide distance for moving the tray in and out under the work surface, which matters when planning front overhang and clearances. Momentum sit-stand arm with keyboard tray connects to this glide track, creating a single unit that installs beneath a worktop or similar surface. The Knape and Vogt tray assembly dimensions of 21-1/2 inches wide by 10-1/2 inches deep help layout work when checking space between desk supports and nearby components. The mousing surface uses an MDF slide-through design next to the tray, so mouse movement stays on a rigid panel that travels with the keyboard arm.
The Knape and Vogt Momentum sit-stand arm with keyboard tray operates as an under-desk solution wherever a sit-stand workflow is needed, using the 21-3/4 inch arm and track to move the tray into working position. In office or shop environments, the Lift-n-Lock height adjustment supports changing from seated to standing postures by repositioning the arm, so one station handles varied operators throughout a shift. The 21-1/2 inch wide by 10-1/2 inch deep rugged ABS tray assembly gives the keyboard its own platform, which is helpful where desk surfaces are crowded with tools, documents, or monitors. The MDF slide-through mousing surface keeps mouse work near the keyboard on the same level, supporting pointing tasks like CAD, design, or data entry from a single arm-mounted position.
The Lift-n-Lock height adjustment on the Momentum sit-stand arm provides a consistent method to raise or lower the tray, which helps installers and users return to familiar positions without guesswork when reconfiguring a station. The soft touch knob handling keyboard tray tilt adjustment allows small changes to the tray angle, so users can set flatter or more angled positions to match their typing preference over long sessions. The removable padded palm rest at the front of the rugged ABS tray gives a contact point to support hands during pauses, which can reduce hard edges against the wrist area during extended use. The anti-slip mat helps stabilize the keyboard on the ABS tray as the arm moves, supporting key accuracy when the tray is repositioned under load. The MDF slide-through mousing surface travels with the tray on the same assembly, keeping cursor control predictable because the mouse position stays relative to the keys, not the main desktop. Together, the 21-3/4 inch glide track, defined tray dimensions, and integrated mousing surface create a repeatable workstation geometry around the Knape and Vogt 8478D2101 arm.
The Knape and Vogt 8478D2101 functions as a sit-stand keyboard arm and tray, supporting under-desk keyboard and mouse positioning for workstations that need seated and standing operation.
The Lift-n-Lock height adjustment on the Momentum sit-stand arm sets the tray height by lifting and locking, giving repeatable vertical positions during sit-stand changes through the day.
The soft touch knob controls keyboard tray tilt adjustment, allowing the tray angle to be set without tools so the typing slope can match user comfort and task demands.
This sit-stand keyboard arm uses a 21-3/4 inch long glide storage track, which defines how far the tray can slide under the work surface for storage or positioning.
The keyboard tray assembly measures 21-1/2 inches wide by 10-1/2 inches deep, providing a defined footprint that supports standard keyboards in a compact width.
The slide-through mousing surface is made from MDF, giving a rigid, smooth panel that moves with the arm so mouse work stays aligned with the keyboard position.
The Momentum sit-stand arm with keyboard tray from Knape and Vogt combines a 21-3/4 inch glide storage track, Lift-n-Lock height adjustment, and a rugged ABS tray with MDF slide-through mousing surface. Those verified details support a defined sit-stand workflow with predictable keyboard and mouse geometry. For projects requiring an under-desk sit-stand keyboard arm with integrated mousing and tilt control, this 8478D2101 model aligns the main ergonomic functions into one assembly for straightforward workstation layout.
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