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The Hettich Quadro IW21 is a 21-inch full-extension undermount drawer slide with integrated soft-close, sized for drawer sides from 1/2 inch to 5/8 inch thick and rated at 100 lb per pair. It mounts below the drawer box and stays completely hidden when the drawer is open, making it a clean choice for frameless kitchen and furniture cabinetry.
Frameless cabinetry is where this slide earns its keep. Because there is no face frame to work around, the Quadro IW21 mounts straight to the flat cabinet side panel, keeping the install straightforward and the alignment predictable. Full extension matters most in kitchen base cabinets and bath vanities, where rear storage is wasted if the drawer only opens partway. At 21 inches, this slide suits the standard base cabinet depth that makes up the majority of residential and light commercial kitchen builds. The 100 lb per pair dynamic rating is solid for pots, pans, or hardware drawers that see real daily load, not just occasional light use.
The Quadro IW21 runs on steel ball bearings and carries a zinc finish that protects the steel members through years of indoor service. The zinc coating is a functional finish suited to the dry interior environment of a frameless cabinet — this slide is not intended for wet, exterior, or high-humidity applications. The soft-close mechanism is built into the slide body rather than added on, so there are no separate damper clips to install, align, or replace later. Drawer sides from 1/2 inch up to 5/8 inch (the maximum) seat correctly on this model without needing a separate version for each thickness.
Cabinet shops running frameless production work will find the Quadro IW21 a reliable volume option when full extension and integrated soft-close are in the spec and the slide needs to disappear under the box. Designers specifying kitchen packages get a concealed runner whose load rating holds up to realistic drawer contents — not just a weight claim sized for empty drawers. Contractors installing ready-to-assemble or custom frameless units can hang and adjust the drawer without wrestling with a separate soft-close retrofit. Homeowners building or renovating with frameless boxes get the silent, full-access close that premium kitchens deliver.
The Quadro IW21 is rated for frameless cabinet installation. Face-frame cabinets set the cabinet side back from the front frame and typically need rear mounting brackets or a face-frame-specific slide version. Check whether a face-frame variant of the Quadro IW21 exists for that application before ordering.
This model accepts drawer sides from 1/2 inch to 5/8 inch thick. If your box is built to 3/4 inch sides, a different Quadro IW21 version sized for that thickness is the right call — the two are not interchangeable.
The soft-close is integrated into the slide. No separate adapter or retrofit clip is required.
Undermount slides are typically sold as a pair (one per side of the drawer). Verify the sold-as unit on the product listing before ordering to confirm quantity per purchase.
Undermount slides require the drawer box to be built to the slide manufacturer's specification — including the correct box width formula, side thickness, and rear notch. Build the box to Hettich's published Quadro IW21 spec before installation.
Full access to the drawer, a silent close, and a finish that stays out of sight — the Quadro IW21 delivers the basics that frameless cabinet work demands, day after day.
Sold In: 1 Set