Synchronized Soft-Close Undermount Slide For 21 Inch Kitchen and Bath Drawers

The Grass Dynapro 21 inch undermount slide is a concealed, full-extension runner with integrated soft-close and built-in synchronization, rated 100 lb per pair. It suits drawer boxes with 1/2 to 5/8 inch sides and installs in both face-frame and frameless cabinets.

Key Features

• Built-in synchronization keeps both slides of the pair tracking together on drawers up to 48 inches wide, with no add-on synchronization hardware required.
• Full extension brings the complete drawer out to the cabinet face, putting everything at the back within easy reach.
• Integrated soft-close catches the drawer near the end of travel and settles it shut silently on a liquid damper.
• 100 lb capacity per pair handles loaded kitchen utility drawers and bath storage without strain.
• 5 mm side clearance per side keeps the concealed footprint tight, preserving interior box width.
• Roller bearing, zinc-finish steel delivers smooth, quiet travel and lasting indoor durability.

Where This Slide Earns Its Place

The 21 inch length is the go-to size for standard base cabinet drawers — deep enough to carry pots, pantry staples, or organized utensil trays at full extension. Because Dynapro synchronization is built into every slide, both sides of a wide drawer move as one unit from the first cycle to the last, which matters most on pots-and-pans drawers and wide linen pulls where one-sided loading is common. The full-extension travel means nothing stays hidden in the back, and the soft-close damper means no slamming regardless of how hard the drawer is pushed. This is the slide for shops and contractors who want premium undermount performance in the most common kitchen drawer length.

Construction and Finish

Steel members with a zinc finish give this slide the corrosion resistance it needs for long indoor service. The roller-bearing carriage runs quietly under load and maintains consistent travel feel over time. Because the slide mounts concealed beneath the drawer box, the zinc finish is entirely functional — it protects the mechanism and stays hidden during use. The nominal length is 21-11/16 inches, with a minimum installation depth of 21-27/32 inches, so verify the cabinet interior accommodates the slide before ordering.

Who This Slide Is For

Cabinet shops running production kitchens will find the Dynapro 21 inch a natural fit for base cabinet drawer stacks where consistent front alignment and quiet operation matter across dozens of boxes. Residential remodelers and designers specifying premium kitchens benefit from the synchronized movement on wide drawers and the clean concealed look. Homeowners tackling a single vanity or pantry upgrade get a slide that performs well above its size. The 1/2 to 5/8 inch side-thickness range covers the most common dovetailed maple and doweled plywood box constructions, so the slide works with the shop's standard material without retooling.

Frequently Asked Questions

The Right Slide for the Most Common Kitchen Drawer

Match the 21 inch Dynapro to your drawer box, add the series hardware your cabinet construction requires, and every drawer in the run closes silently and tracks true.