18 Inch Undermount Slide for Cabinets That Demand a Clean Look

The Grass Elite Plus 18 inch undermount drawer slide is a full-extension, soft-close concealed runner for 5/8 inch drawer sides, suited to both face-frame and frameless cabinet construction. It runs on roller bearings with a zinc-finished steel body and stays completely hidden beneath the drawer box when the drawer is open.

Key Features

• Full extension brings the entire drawer box out to the cabinet face, so nothing at the back is out of reach.
• Integrated soft-close catches the drawer near the end of travel and settles it shut without slamming.
• 75 lb capacity per pair handles loaded kitchen and bath drawers comfortably.
• Fits 5/8 inch drawer sides, including the standard dovetailed and doweled box constructions used in production shops.
• Face-frame and frameless compatible, giving the same slide flexibility across cabinet styles on a single job.
• Roller-bearing steel construction with zinc finish for smooth travel and durable indoor service life.

Where This Slide Fits the Job

An 18 inch undermount is the right length for base cabinet drawers in kitchens and baths where a 18 to 20 inch interior depth is standard. Spice drawers, utensil drawers, and bathroom vanity drawers all land in this range. Full extension means a loaded spice drawer or a stacked utensil tray comes all the way out to the cabinet face, so there is no reaching past the front row to find what is at the back. The soft-close mechanism is the detail that clients and homeowners notice most — the drawer settles shut on its own instead of bouncing or slamming, which matters in quiet kitchens and shared spaces.

Because this slide suits both face-frame and frameless cabinets, it works across the American and European construction methods without stocking two different runners. In face-frame cabinets, the rear end of the slide needs the matching Elite Plus rear mounting brackets — those are sold separately and are Elite Plus-specific, so do not substitute brackets from another series.

Build and Finish

Steel members with a zinc finish stand up to years of indoor use. The roller-bearing carriage keeps the drawer running smoothly even when the box carries a consistent load. Because the slide mounts beneath the drawer box, the zinc finish is functional rather than decorative — it will not be visible when the drawer is closed or open. The slide's concealed position also keeps the cabinet interior looking clean, with no hardware exposed along the drawer sides.

Who Should Order This Slide

Cabinet shops building stock or semi-custom kitchens will find the Elite Plus a reliable mid-range undermount: it delivers full extension and integrated soft-close without the added cost of synchronization or multi-dimensional front adjustment. Designers specifying handle-free or minimalist interiors get the clean look of an undermount with soft-close motion that fits within a residential budget. Contractors replacing slides in existing face-frame kitchens will also find this SKU fits the construction without sourcing a dedicated face-frame-only model, as long as the drawer boxes are built to 5/8 inch sides and the Grass specification for this series.

The drawer box must be built to the Grass Elite Plus specification for the 18 inch nominal length — correct box width, bottom recess, rear notch, and drilling for the front locking devices. A box that does not follow the spec will not seat properly on the slides.

Frequently Asked Questions

The Right Concealed Slide for the Right Drawer Box

Match the slide length to your cabinet depth, build the drawer box to the Grass Elite Plus specification, add the series-specific locking devices and any face-frame brackets your construction requires, and this concealed runner delivers full access and a quiet, controlled close on every cycle.