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The Blum TANDEM PLUS 21 inch full-extension undermount slide is a concealed roller-bearing runner built specifically for face-frame cabinet construction, keeping hardware hidden beneath the drawer box while delivering complete access to the full drawer depth.
Most undermount slides mount straight to the flat side of a frameless cabinet box. This Blum TANDEM PLUS slide is configured for face-frame cabinetry, where the cabinet side sits set back behind the front frame. In face-frame installs, the rear of the slide needs support from matching TANDEM rear mounting brackets — these are series-specific Blum parts and are sold separately. Specifying the correct rear brackets before the job starts is the step most often missed on face-frame undermount work, and it is the detail that separates a smooth install from a second order.
The 21 inch length is the right fit for standard kitchen base drawers with deeper box runs, giving full access to spice storage, utensil trays, and file or binder drawers that need every inch of their depth reachable. Build the drawer box to Blum's published specification for the TANDEM series: correct nominal length, box width formula for the 3/16 inch side clearance, bottom recess, rear notch, and locking-device drilling. The slide will not seat correctly on an off-spec box.
The slide body is steel with a zinc finish — the standard functional finish for Blum undermount hardware. Because this runner mounts beneath the drawer box and stays fully out of sight when the drawer is open, the finish serves corrosion resistance rather than appearance. The roller-bearing carriage runs quietly under load and keeps travel consistent across the life of the installation. For indoor cabinetry, the steel-and-zinc construction handles daily kitchen or bath use without issue.
This is the right slide for cabinet shops and contractors running face-frame kitchens or bath vanities who want a concealed, full-extension undermount runner in the 21 inch length class. Homeowners renovating traditional-style kitchens will find it the standard premium choice for adding soft-close-ready or standard-travel concealed slides to deeper base drawers. Designers specifying hardware for face-frame built-ins — from pantry cabinets to mudroom storage — can count on the TANDEM series as the reference undermount for that construction style. If the cabinet is frameless, a different TANDEM configuration is the better fit; this SKU is face-frame only.
Yes. Face-frame cabinets require TANDEM rear mounting brackets to support the back of the slide — these are sold separately and are specific to the TANDEM series. You will also need front locking devices, which are TANDEM-specific and not interchangeable with other brands or series. Confirm which locking device version matches your drawer box setup before ordering.
The product attributes list this slide for face-frame cabinets with a roller-bearing steel construction, but the source data does not specify a drawer side thickness range for this SKU. The standard TANDEM PLUS 563H series fits 1/2 to 5/8 inch sides; confirm the side thickness specification for the 562H series against Blum's published installation guide before building your drawer boxes.
The sold-as unit is not stated in the source data for this SKU. Contact the order desk to confirm whether the price is per pair or per single slide before placing a production quantity order.
The source data for this SKU does not list a motion technology attribute, so soft-close cannot be confirmed. If soft-close is required, verify with the product spec sheet or consider the TANDEM plus BLUMOTION series, which includes integrated soft-close damping.
Pair this slide with the correct TANDEM rear mounting brackets and series-specific locking devices, build the drawer box to Blum's spec, and you have a concealed full-extension runner that fits the face-frame job the way it was designed to.
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