Undermount Drawer Slide For Thick-Sided Drawer Boxes

This is the heavy-duty version of the Grass Dynapro 18 inch concealed undermount — a full-extension, soft-close runner engineered for drawer boxes built from 5/8 to 3/4 inch material, rated 132 lb per pair. Where the standard Dynapro is built around thinner drawer sides, this version's geometry and locking-device spacing are sized for the heavier stock that hardwood shops and solid-plywood boxes commonly use.

Key Features

• 132 lb capacity per pair — the heavy-duty Dynapro rating, suited to loaded pantry pull-outs, utility drawers, and oversized kitchen drawers.
• Full extension — the entire drawer box travels to the cabinet face, putting the back of the drawer within reach.
• Integrated soft-close — a damper catches the drawer near the end of travel and settles it shut without slamming.
• 5/8 to 3/4 inch drawer side compatibility — built for thicker hardwood or plywood box sides, not interchangeable with the standard 1/2 to 5/8 inch version.
• Face-frame and frameless cabinet support — installs in either construction with the correct series hardware.
• Roller-bearing carriage, steel construction, zinc finish — a durable, low-profile runner that stays hidden beneath the box.

Where This Slide Earns Its Place

The heavy-duty Dynapro is the right call when drawer construction calls for thick stock and the load rules out standard-capacity undermounts. Solid dovetailed hardwood boxes, thick Baltic birch plywood, and furniture-grade drawer builds with 3/4 inch sides all fall outside the range of the more common 1/2 to 5/8 inch Dynapro version. At 132 lb per pair, this slide also covers applications where the contents push past what a 100 lb undermount can handle — a pots-and-pans drawer loaded to capacity, a base cabinet used as a tool roll-out, or a recycle pull-out carrying real weight. The full-extension travel means nothing hides at the back of the box, which matters when every cubic inch of a kitchen drawer is in use.

Construction and Finish

The Dynapro runner is steel with a zinc finish, running on a roller-bearing carriage. Because it mounts concealed beneath the drawer box, the finish serves a functional role — corrosion resistance through years of indoor service — rather than a decorative one. The slide's 6mm side clearance and 18-11/16 inch nominal length govern box-width calculations; the drawer box must be built to Grass's published specification for this series, including the correct width formula for the clearance, bottom recess, rear notch, and drilling for Dynapro front locking devices. Minimum installation depth is 18-27/32 inches, so verify the cabinet interior before ordering if depth is tight.

Who This Is For

Custom cabinet shops that build from solid hardwood or thick plywood are the primary audience — this is the version to reach for when drawer sides land at 3/4 inch and a concealed, full-extension runner is the spec. It also suits designers and contractors specifying premium undermounts for heavy-use base cabinets where a standard-capacity slide would be undersized. For drawer boxes with 1/2 to 5/8 inch sides, the standard Dynapro version is the correct match; this heavy-duty model is not a drop-in substitute for that version, and the locking devices are Dynapro-specific and not interchangeable with other brands or series.

Frequently Asked Questions

The Right Runner for Heavy Hardwood Builds

When the drawer box is built from thick stock and the load demands more than a standard undermount can carry, this 18 inch Dynapro heavy-duty slide closes the gap — concealed, fully extended, and damped to a silent stop every time.