Heavy-Duty Undermount Slide For Oversize and High-Load Drawers

This is Grass's 18 inch Dynapro undermount slide in the heavy-duty configuration — a fully concealed, full-extension runner rated 132 lb per pair with integrated soft-close, built for drawer boxes with 1/2 to 5/8 inch sides.

Key Features

• 132 lb capacity per pair — the heavy-duty Dynapro rating, suited to oversize, deeply loaded, or wide drawers that standard 90 to 100 lb undermounts cannot cover.
• Full extension — the entire drawer comes out to the cabinet face, putting the back of the drawer within reach.
• Integrated soft-close — a liquid damper slows the drawer over the last inch of travel for a silent, controlled close every time.
• Built-in synchronization — both slides track together on drawers up to 48 inches wide without a separate synchronization rod or add-on hardware.
• Roller-bearing carriage, steel construction, zinc finish — smooth travel under sustained load in an indoor concealed-slide application.
• Suits face-frame and frameless cabinets — one slide family covers both construction types with the appropriate mounting hardware.

Where the 132 lb Rating Changes the Spec

Most standard undermount slides top out at 90 to 110 lb per pair — enough for a typical kitchen drawer, but short of what a pots-and-pans pull-out, a heavily loaded utensil drawer, or a wide pantry application actually puts on the hardware. The heavy-duty Dynapro steps into that gap. At 132 lb per pair, it handles the drawer contents that would push a standard undermount to its limit, and Dynapro's built-in synchronization keeps both sides of a wide drawer tracking evenly without any separate rod kit. If the project calls for oversize boxes, unusually deep drawers, or simply a slide you do not have to worry about under daily production use, this is the tier to specify.

Construction and Finish

The slide runs on a roller-bearing carriage inside steel members finished in zinc — a functional, corrosion-resistant finish suited to years of indoor service. Because the Dynapro mounts entirely beneath the drawer box, the zinc finish is hidden when the drawer is open. The integrated liquid damper is built into the slide body, not added on, so the soft-close action stays consistent without a separate component to adjust or replace. Side clearance is 5mm per side, and the nominal slide length is 18-11/16 inches with a minimum installation depth of 18-27/32 inches — both tight to the 18 inch drawer length, so verify cabinet interior depth before ordering.

Who Specifies This Slide

Production cabinet shops running a premium line, custom builders specifying heavy drawer applications, and designers calling out concealed hardware for kitchens and pantries where load ratings matter beyond the standard tier. The heavy-duty Dynapro is also the right call for any installer who wants the same Dynapro locking device and bracket system across a job but needs extra capacity on specific drawers. In face-frame cabinets, Dynapro-specific rear mounting brackets are required and sold separately — the rear bracket is the most commonly missed part in face-frame undermount orders, so include it in the initial hardware pull.

The Right Slide for Drawers That Work Hard

When the drawer box is large, the load is real, or the job simply cannot afford a slide that is undersized, the heavy-duty Dynapro delivers full extension and soft-close at a capacity level that leaves room to spare.