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The Fastcap Miller Fastblock is an adjustable plastic spacer designed to fine-tune the mounting depth of drawer slides in face-frame and frameless cabinets, bridging the gap between the slide and the cabinet side when standard mounting falls short.
Face-frame cabinets place the cabinet side set back from the front frame, which means a slide mounted flush to the side often sits too deep for the drawer front to close properly. Rather than shimming with scraps of plywood or remounting the slide with trial-and-error blocking, a dedicated adjustable spacer positions the slide at the correct depth in one step. These spacers are also useful when retrofitting slides into existing casework where interior dimensions fall between standard mounting positions, or when aligning a new slide to match the depth of an adjacent drawer in a run of cabinets.
White injection-molded plastic keeps the spacer light and dimensionally stable. Unlike wood shims, plastic does not compress, swell, or split when a screw is driven through it, so the slide stays at the set depth through years of drawer cycles. The white finish blends into most cabinet interiors and becomes invisible once the drawer is installed.
Cabinet shops running face-frame production keep a box on hand because depth mismatches are a routine part of the job, not an occasional problem. Installers fitting slides into older or site-built cabinets where interior dimensions vary from box to box also rely on adjustable spacers to avoid custom blocking. The 100-count bulk pack suits any shop or installer working through multiple cabinets at a time rather than a single one-off drawer.
Yes — the spacer mounts to the cabinet side independent of the slide, so it works with side-mount ball-bearing slides, Euro roller slides, and other screw-on drawer hardware regardless of brand.
The spacer provides up to 25 mm (approximately 1 inch) of depth adjustment from its 5 mm base, covering the 5/8 inch to 1 inch range stated in the product name. Set the adjustment before driving the mounting screws.
Typically two spacers per slide member — one near the front and one near the rear — keep the slide parallel to the cabinet side. For longer slides, a third spacer at mid-span adds stability. The 100-count pack covers roughly 25 to 50 slide installations depending on your spacing approach.
The spacer positions the slide; the slide's mounting screws carry the load. Once the screws are set, the spacer holds its position and does not compress or shift under normal drawer use.
A box of 100 adjustable spacers on the shelf means depth mismatches get corrected in seconds instead of minutes, keeping the installation moving from one cabinet to the next.
Sold In: 1 Package
Quantity | Unit Price | Catalog | ||||
|---|---|---|---|---|---|---|
Sold in: 1 Set |  FAMILLERFASTBLOCK Mfr# MILLER FASTBLOCK | Fastcap Spacers, White, MILLER FASTBLOCK |