Full-Extension Soft-Close Undermount Slide Built for 3/4 Inch Drawer Sides

This is the Grass Dynapro 21 inch full-extension undermount slide for drawer boxes built from 5/8 to 3/4 inch material — a concealed, soft-close runner rated 100 lb per pair that suits shops working with thicker stock and solid-wood drawer sides.

Key Features

• Engineered for 5/8 to 3/4 inch drawer sides — covers thicker solid-wood and plywood box stock that the standard 5/8 inch version does not fit.
• Full extension — the entire 21 inch drawer box comes out to the cabinet face, putting the back of the drawer within easy reach.
• Integrated soft-close — a damped mechanism catches the drawer near the end of travel and settles it shut without slamming.
• 100 lb capacity per pair — handles loaded kitchen, bath, and utility drawers with headroom to spare.
• Fits face-frame and frameless cabinets — one slide version covers both construction types with the correct series hardware.
• Roller-bearing carriage, zinc-finish steel — smooth, quiet travel under load with a durable indoor finish.

Where This Slide Earns Its Place

The 5/8 to 3/4 inch side-thickness range is what sets this Dynapro version apart from the more common 1/2 to 5/8 inch model. Shops building drawer boxes from 3/4 inch hardwood — thick dovetailed maple sides, solid-wood walnut or cherry construction, or heavy plywood stock — need a slide that is dialed in for the extra material thickness. The locking devices, box-width formula, and side clearance on this version are all sized for the thicker box; the standard model is not a substitute. At 21 inches, the slide suits standard-depth base cabinets and utility drawers where full rear access matters: spice pull-outs, utensil drawers, and file storage where the back inch of the box cannot be wasted.

Construction and Finish

The Dynapro runner is a steel roller-bearing undermount with a zinc finish — a functional, corrosion-resistant coating suited to indoor cabinet environments. Because the slide mounts beneath the drawer box and is fully hidden when the drawer is open, the finish serves protection rather than appearance. The roller-bearing carriage delivers smooth travel across the full 21 inch stroke, and the integrated soft-close damper operates within the slide body rather than as a separate add-on. The 6mm side clearance and 21-27/32 inch minimum installation depth are the two fit-critical dimensions to confirm before ordering.

Who This Is For

This slide is the right choice for custom cabinet shops and residential installers who regularly build drawer boxes from solid wood or thick plywood and want a premium concealed runner that matches the material. It suits frameless European-style cabinetry and traditional face-frame construction equally — face-frame installs require the series-specific Dynapro rear mounting brackets, which are sold separately and are not interchangeable with rear brackets from other slide brands or series. Designers specifying handle-less fronts with soft-close closing will find this slide pairs with Dynapro's motion accessory lineup as well, keeping the system consistent across a project.

Frequently Asked Questions

The Right Slide for Thick-Side Construction

When the box is built from solid wood or heavy plywood, the Dynapro 21 inch slide for 5/8 to 3/4 inch sides ensures the concealed runner is matched to the material — so the drawer runs true, closes quietly, and stays fully accessible at 100 lb capacity.