Salice Progressa 21" Soft-Close Full Extension 100 lb Undermount Drawer Slide, Zinc, G5U9S533CXF6

Salice Progressa+ Undermount Slide for 3/4 Inch Drawer Sides

The Salice Progressa+ is a 21 inch full-extension, soft-close undermount drawer slide engineered specifically for drawer boxes built from 3/4 inch material. It mounts concealed beneath the box in frameless cabinets, rated 100 lb per pair, and closes with an integrated soft-close damper.

Key Features

• 3/4 inch (19mm) side-thickness version — engineered for drawer boxes with sides up to 3/4 inch thick, a separate model from the standard 5/8 inch line.
• Full extension — the drawer travels its full 21 inch length, bringing the entire box out to the cabinet face.
• Integrated soft-close — a built-in damper catches the drawer near the end of travel and settles it silently shut.
• 100 lb capacity per pair — handles loaded kitchen and bath drawers comfortably.
• Fully concealed mounting — the slide sits beneath the drawer box, out of sight when the drawer is open.
• Steel construction with zinc finish — durable indoor hardware built for years of daily cycling.

Where This Slide Fits

This slide was made for shops building drawer boxes from 3/4 inch hardwood or plywood — face-framed blanks, thick dovetail sides, or shop-sawn stock that runs heavier than the standard 5/8 inch cabinet box. Frameless cabinet construction is required; the slide mounts directly to the flat interior panel. At 21 inches, it suits standard kitchen base cabinet depths, pantry pull-outs, and deeper bath vanity drawers. The 100 lb per pair rating covers most loaded kitchen applications, from pots-and-pans drawers to well-stocked utensil pulls.

The drawer box must be built to Salice's published specification for the Progressa+ series — nominal 21 inch length, the correct box width derived from the series formula, proper bottom recess, rear notch, and drilling for the Progressa-specific front locking devices. An off-spec box will not seat correctly on the slides.

Construction and Finish

Steel members with a zinc finish provide the structural backbone for indoor cabinetry service. The zinc plating protects against corrosion in normal interior conditions and holds up through years of daily use. Because the slide rides beneath the drawer box, finish is a functional consideration rather than a decorative one. The integrated soft-close mechanism is part of the slide body — no add-on damper kit is needed.

Who Orders This Slide

Custom cabinet shops working with thick hardwood drawer stock are the primary buyers. If your production process calls for 3/4 inch maple, cherry, or plywood sides — common in furniture-grade cabinetry and premium residential projects — this is the Progressa+ version to specify. Designers and contractors sourcing hardware for high-end frameless kitchen or bath installations will also find the 100 lb rating and full-extension travel a solid match for client expectations. The 5/8 inch version of the Progressa+ is a different model; order by side thickness, not by slide name alone.

The Right Slide for Thick-Sided Drawer Boxes

Matching the slide to your drawer stock thickness is the single most important selection step in this segment — and this 21 inch Progressa+ is purpose-built for the 3/4 inch box that standard undermount versions cannot accommodate.