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The Pro Value Series PRO 634 is a 21 inch full-extension, soft-close undermount drawer slide engineered for drawer boxes with sides up to 3/4 inch thick. It ships complete with 2D locking clips and rear mounting brackets, so every component the installation requires arrives in one box.
Shops that build drawer boxes from 3/4 inch hardwood or plywood need a dedicated slide for that material thickness — the standard 5/8 inch version is a different model and will not seat correctly on a thicker box. The PRO 634 in the 21 inch length is sized for base-cabinet and utility drawers in that class: kitchen utensil pulls, bath vanity drawers, and shop storage boxes where the box is built from 3/4 inch stock and the drawer depth calls for a 21 inch runner. The drawer box must be built to the PRO 634 specification for the 21 inch nominal length, including the correct box-width formula, bottom recess, and rear notch for the locking clips.
The slide members are steel with a zinc finish, which protects against corrosion through years of indoor service. Because the slide mounts concealed beneath the drawer box, the zinc finish is functional rather than decorative. The 2D locking clips that come with this SKU provide height and side adjustment at the drawer front after the box is hung, letting the installer true the front without removing the drawer. The rear mounting brackets support the back end of the slide in both face-frame and frameless installations. No supplemental hardware order is needed to complete a standard install.
This is the value-tier choice for cabinetmakers and shops that want a concealed, soft-close undermount for 3/4 inch boxes without the cost of a premium brand. It suits production runs where included hardware simplifies kitting — the clips and brackets in the box mean no separate accessory line items per drawer. Homeowners completing a custom vanity or cabinet project with 3/4 inch drawer sides get a professional-grade concealed slide at a straightforward price. The 100 lb per pair rating covers the vast majority of residential drawer loads at this length.
No. The PRO 634 is the 3/4 inch (19mm) side-thickness version of this undermount program. It is engineered around that material thickness. For 5/8 inch (16mm) drawer sides, a different model in the line is required — the two versions are not interchangeable.
The included locking clips adjust the drawer front in two directions — height and side — after the drawer box is seated on the slides. This lets the installer align the front without pulling the box out, which speeds up front-fitting on multi-drawer runs.
Yes. The rear brackets support the back end of the slide in either construction. In a frameless cabinet they mount directly to the interior side panel; in a face-frame cabinet they bridge behind the frame to give the slide its rear anchor point.
This SKU is sold as a pair — one left and one right member — which is one complete set for a single drawer. The 100 lb weight capacity stated is the per-pair rating.
Yes. Undermount slides require the drawer box to match the slide's nominal length. Build the box to the PRO 634 specification for the 21 inch nominal length, including the correct width, bottom recess, and rear notch. A box that does not match the spec will not seat correctly on the slide.
For shops and installers working with 3/4 inch drawer stock, the PRO 634 delivers full extension, soft-close performance, and all required mounting hardware in a single, straightforward SKU — no separate accessory orders, no missing parts on installation day.
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