20 Inch Full Extension Drawer Slides For Heavy Workshop and Industrial Drawers

The Knape and Vogt 8900 series is a 20 inch, full-extension, side-mount ball-bearing drawer slide built for drawers that carry serious weight. Rated at 500 lb per pair in a zinc steel finish, this slide handles the demands of shop cabinets, workbenches, tool storage, and institutional casework where standard kitchen-grade hardware runs out of capacity.

Key Features

• 500 lb load rating per pair — one of the highest ratings in the side-mount ball-bearing category, suited for loaded tool drawers and heavy-duty storage.
• Full extension — the drawer travels its full 20 inch length so every item at the back of the drawer is reachable without reaching blind into the cabinet.
• Zinc steel construction — a durable plated finish that stands up to the dry indoor environments where heavy-duty cabinetry lives.
• Ball-bearing movement — hardened steel balls in full-length raceways deliver smooth, consistent travel even at high loads.
• Non-handed side mount — the same slide fits either side of the drawer, eliminating left/right ordering complications on multi-drawer builds.
• 3/4 inch side clearance per slide — the standard clearance requirement for this series; build the drawer box 1-1/2 inches narrower than the cabinet opening.

Where This Slide Earns Its Keep

A 500 lb per pair rating puts this slide in a different duty class from the 75 to 100 lb hardware typically found in kitchen cabinetry. That capacity is what you need when a drawer is carrying hand tools, boxed fasteners, heavy machine parts, or dense file stock. In a shop or garage setting, a drawer loaded with sockets, wrenches, or bulk hardware can hit that weight faster than expected. The 8900 series is also a natural fit for institutional and commercial casework — library stacks, service counters, parts storage, and anywhere the drawer gets heavy use from multiple people through the day.

The 20 inch slide length suits standard-depth base cabinets and workbenches. Full extension means the full drawer depth is accessible, which matters when you are pulling out a tray of organized parts and need to see everything at once.

Zinc Finish in Context

Zinc plating protects the steel members against oxidation in the dry, indoor environments where heavy-duty storage cabinets are most common: workshops, garages, utility rooms, and commercial back-of-house installations. The finish is functional rather than decorative — in most applications the slides are inside the cabinet and out of sight when the drawer is closed. If the installation is in a wet, washdown, or high-humidity setting, stainless steel slides are the appropriate choice for that environment. Zinc-plated steel is for dry indoor work.

Who Specifies the 8900 Series

Cabinet shops building shop furniture, workbenches, or tool-storage cabinetry reach for a slide in this class when the load specs require it. Contractors fitting out utility rooms, server rooms, or service counters need a side-mount slide that can handle whatever gets stored without a second thought about weight limits. The poly-pack format and non-handed design make it straightforward to order and install across a run of identical drawers. This is also a practical slide for a serious hobbyist or maker upgrading a home shop — one pair handles a drawer full of heavy tools that would overwhelm lighter hardware.

Common Questions

Built Around the Load, Not the Look

When the drawer needs to move 500 lb reliably and reach the back of a 20 inch cabinet every time, the 8900 series in zinc is the side-mount slide that gets the job done without overcomplicating the install.