20 Inch File Drawer Slide For Heavy Storage and Lateral File Applications

This is a 20 inch full-extension side-mount ball bearing file drawer slide from Knape & Vogt's 8520 series, rated 175 lb per pair with a hold-in anti-rebound detent that keeps loaded drawers from bouncing back open after a firm close.

Key Features

• 175 lb load class per pair — well above the standard 100 lb cabinet slide, built for drawers carrying real weight.
• Full extension — the drawer travels out to the cabinet face so the entire interior is reachable, front to back.
• Hold-in anti-rebound detent — a mechanical catch holds the drawer closed and stops it from rebounding when shut firmly; no spring assist, no damper.
• Progressive ball bearing movement — steel ball bearings in full-length raceways deliver smooth, controlled travel even under a full load.
• Non-handed design — both slides in the pair are identical, so there is no left/right sorting on the bench.
• 1/2 inch side clearance per slide — matches the standard side-mount ball bearing format for straightforward drawer box sizing.

Where the 8520 Earns Its Place

The 8520 series addresses the gap between a standard kitchen cabinet slide and a dedicated heavy-duty industrial runner. At 175 lb per pair, it handles lateral file drawers loaded with folders, deep storage drawers carrying tools or hardware bins, and shop cabinet drawers where the contents routinely push past the 100 lb class ceiling. Full extension means nothing gets buried: the back of a 20 inch drawer comes completely clear of the cabinet face when open. The hold-in detent is the right choice for file and shop environments where a drawer that bounces back open after every close is a genuine work interruption — the detent keeps it shut until intentionally pulled.

Construction and Finish

The 8520 series is built from steel with a zinc finish, the reliable standard for side-mount ball bearing slides in indoor service. Zinc plating protects the steel members against the everyday humidity and handling of an office or cabinet shop without adding the cost of stainless. The progressive ball bearing movement means the bearings are distributed to bear load evenly across the travel arc rather than concentrated at one point, which smooths out the feel of a heavily loaded drawer over the life of the slide. This is a poly-pack unit — the pair arrives bagged with mounting hardware included.

Who This Slide Is For

Cabinet shops building lateral file units or office credenzas will find the 8520 series spec-appropriate from the first order: the 175 lb rating covers the realistic load of a full file drawer without leaving capacity on the table. Contractors retrofitting office furniture and shop managers building out tool storage will also find the 20 inch length useful — long enough for a deep filing cabinet drawer but compact enough for workbench storage cases. This is a side-mount slide, so it sits visible beside the open drawer box; for applications where concealed hardware matters, an undermount is the right call instead. For face-frame cabinet installations, rear mounting brackets are required to support the back of the slide — those brackets are series-specific and sold separately.

The Right Slide Keeps the Job Moving

A 175 lb file drawer slide that stays closed, opens completely, and installs without left/right sorting removes three common friction points from a lateral file or heavy storage build — one poly-pack pair per drawer, ready to mount.