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The Knape and Vogt 8520 series is an 18 inch over-travel, full-extension side-mount ball bearing file drawer slide rated 175 lb per pair, built for loaded file and heavy storage drawers that exceed the reach of a standard 100 lb cabinet slide.
A loaded lateral file drawer stuffed with hanging folders, a deep parts bin in a shop cabinet, a heavy-duty tool drawer under a workbench — these are the applications where a standard 100 lb kitchen slide falls short. The 8520 series steps into that gap with a 175 lb per pair rating and over-travel action that carries the drawer past the cabinet face. Under a countertop overhang or inside a face-frame cabinet with a deep front rail, that extra travel is what puts the back of the drawer within reach. The hold-in anti-rebound detent means the loaded drawer stays shut after a firm close rather than bouncing back into the aisle.
The 8520 series is cold-formed steel with a zinc finish — the working standard for side-mount ball bearing slides in office, shop, and institutional environments. Zinc provides reliable corrosion resistance through years of indoor service. This is a functional finish on a slide that sits beside the drawer box, out of sight when the drawer is closed. It is not a decorative or stainless finish, and it is suited to dry indoor applications.
Cabinet shops building file pedestals, lateral file units, or heavy utility cabinets will find the 8520 sized right where the 8500 series leaves off. At 1/2 inch side clearance per side, the drawer box is built to the same formula as any standard side-mount installation — 1 inch narrower than the cabinet opening. The non-handed design means high-volume cutting lists carry a single part number for both sides of every drawer. In face-frame cabinets, rear mounting brackets are required to support the back of the slide; those brackets are series-specific and sold separately. The Bulk-Pack format suits shops ordering across multiple drawer counts in a single pull.
Yes. The 8520 is its own series within the KV heavy-duty file slide family. Confirm that any rear mounting brackets or accessories are specified for the 8520 series rather than assumed to carry over from the 8500 or 8505.
Yes. The 18 inch figure is the closed slide length. Over-travel means the drawer member travels past that nominal length so the entire drawer clears the cabinet opening. The exact over-travel distance is not stated in the product attributes; measure your cabinet before ordering if clearance is tight.
No. The hold-in anti-rebound detent is a mechanical catch that keeps the drawer closed once it is pushed shut. It does not dampen or slow the closing travel — this is not a soft-close slide.
No. The 8520 is non-handed, so both slides in the pair are the same part. Order the quantity that matches your drawer count.
Bulk-Pack means the slides ship loose in a carton rather than in retail polybags. It is the practical format for shops ordering multiple pairs at once. Confirm the pair count per carton on the product listing before placing a production order.
When the drawer is going to carry real weight day after day, the 8520 series delivers the load rating, the over-travel reach, and the stay-closed reliability to keep it working without complaint.
Sold In: 1 Set
