Grass Dynapro Undermount Drawer Slide For Heavy-Load Applications

This is the 21 inch Grass Dynapro heavy-duty undermount drawer slide — a full-extension, soft-close concealed runner rated 132 lb per pair, built for drawer boxes with 1/2 to 5/8 inch sides in face-frame or frameless cabinets. At this capacity, it covers the demanding applications where standard 90 to 100 lb undermounts fall short.

Key Features

• 132 lb weight capacity per pair — the heavy-duty tier of the Dynapro line, sized for oversize, deeply loaded, or wide drawers that exceed the standard undermount range.
• Full extension — the entire drawer travels out to the cabinet face, putting the back of the box within reach.
• Integrated soft-close — a damper catches the drawer near the end of travel and settles it shut silently, every cycle.
• Fits face-frame and frameless cabinets — one slide serves both construction types with the appropriate rear mounting hardware.
• Roller-bearing carriage, steel construction, zinc finish — smooth travel under load, built for years of indoor service.
• 5 mm side clearance — a tighter clearance than standard side-mount slides; build the box to Grass's published specification for the Dynapro series.

Where This Slide Earns Its Place

The 132 lb rating puts this slide in territory standard undermounts cannot cover: pots-and-pans drawers stacked with cast iron, utensil drawers in commercial-adjacent kitchens, deep pantry pull-outs, and any application where the loaded drawer weight pushes past what a 90 to 100 lb runner is designed to handle. It also suits wide drawers where the Dynapro system's built-in synchronization keeps both slides tracking evenly without an add-on rod — a real advantage on a heavily loaded box that would otherwise rack under uneven pulling. The 21 inch nominal length, with a 21-27/32 inch minimum installation depth, fits standard base-cabinet drawer banks comfortably.

Construction and Finish

Steel slide members with a zinc finish give this runner its structural backbone for indoor cabinetry. The roller-bearing carriage keeps travel smooth and quiet under substantial load. Because the slide mounts beneath the drawer box, the finish is functional rather than decorative — the hardware stays hidden when the drawer is open, leaving a clean wood-only look inside the cabinet.

Who Should Order This Slide

Cabinet shops building high-end kitchens or production runs where drawer weight is a real variable will find this the right tool: heavy enough to cover loaded pantry and cookware drawers, refined enough for residential soft-close expectations. Designers specifying for clients who cook seriously — or who want concealed slides without worrying about capacity headroom — can call out the Dynapro heavy-duty tier with confidence. Contractors sourcing for a remodel where the existing box is 5/8 inch dovetailed material will find this fits without a rebuild, provided the box is built to Grass's nominal length and width specification for the series.

Frequently Asked Questions

Full-Extension Capacity Where the Job Demands It

Match this slide to the drawer length, confirm your box is built to the Grass Dynapro specification, add the rear mounting hardware your cabinet construction requires, and the heaviest drawers in the project move on concealed runners rated for the work.