Salice F70 21" Soft-Close Full Extension 170 lb Undermount Drawer Slide, Zinc, UBF70FFSC-21

170 lb Soft-Close Capacity for Face-Frame and Frameless Cabinets

The Salice F70 21 inch soft-close undermount drawer slide is a full-extension, concealed runner rated 170 lb per pair — a heavy-duty capacity in an undermount form, available in a version that works in both face-frame and frameless cabinets. It suits drawer boxes with 1/2 to 5/8 inch sides and closes on an integrated damper.

Key Features

• 170 lb per-pair capacity — well above the standard 90 to 110 lb range, handling oversize and heavily loaded drawers without stepping up to a side-mount.
• Full extension — the entire 21 inch drawer box travels out to the cabinet face, making the full interior reachable.
• Integrated soft-close damper — catches the drawer near the end of travel and settles it shut silently, every time.
• Face-frame and frameless compatibility — a single model works in both cabinet constructions with the appropriate series-specific rear mounting brackets for face-frame installs.
• Steel construction with zinc finish — functional indoor durability, fully concealed beneath the drawer box in use.
• For 1/2 to 5/8 inch drawer sides — fits the most common dovetailed and doweled box stock without modification.

Where This Slide Earns Its Rating

A 170 lb capacity per pair opens up applications that standard undermounts cannot reliably serve. Deep pots-and-pans drawers loaded with cast iron, waste-bin pull-outs carrying real weight, pantry-style base drawers stacked with canned goods — these are the jobs where the F70's rating matters. The full extension means the back of a 21 inch box clears the cabinet face completely, so nothing hides at the rear. The soft-close damper handles a loaded drawer the same way it handles a light one: controlled, quiet, and repeatable. For shops building traditional face-frame kitchens that also want concealed slides and a damped close on the heaviest drawers, this slide covers the spec without switching to a side-mount or a separate bracket system.

Construction and Finish

The F70 runs on steel members with a zinc finish — a durable, indoor-rated surface that stays out of sight beneath the drawer box once the front is mounted. The integrated damper is built into the slide body, so there are no add-on cartridges to source or replace. Salice-specific front locking devices and rear mounting brackets are required for installation; these are series-specific parts and do not interchange with other brands or lines. In face-frame cabinets, the rear brackets support the back of the slide behind the frame — order these along with the slide if your shop does not already stock them.

Who Should Specify This Slide

Cabinet shops building face-frame kitchens with heavy-duty drawer requirements are the primary fit. The combined face-frame and frameless compatibility also makes it a useful single-SKU choice for shops running both construction types — one slide covers the line rather than two separate models. Designers specifying concealed hardware on kitchen projects with deep base drawers or bin pull-outs will find the 170 lb rating adds a margin that standard 100 lb undermounts do not. Contractors sourcing slides for a renovation where the existing cabinets are face-frame construction can use this slide without pulling face-frame-specific accessories from a separate line.

A Concealed Slide That Handles the Heavy Work

When a kitchen drawer carries real weight and the cabinet is face-frame construction, the F70 21 inch soft-close slide delivers the capacity, the clean look, and the installation flexibility to get the job done right.