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This is a 20 inch full-extension side-mount ball bearing drawer slide from Knape and Vogt's 8900 series, rated 500 lb per pair in a zinc finish. It is the slide to reach for when the drawer carries genuine weight and full rear access is non-negotiable.
Most cabinet drawers top out at 100 lb per pair. The 8900 series lives in a different duty class entirely. A tool chest drawer loaded with iron, a shop cabinet carrying heavy stock, a commercial pull-out holding equipment — these are the applications where load rating is the first thing on the spec sheet, not a footnote. Full extension means the back of the drawer is always reachable, so even a deep, fully loaded drawer doesn't require unloading to access what's at the rear. Standard motion keeps it simple: no closing mechanism to maintain or override, just steel on bearings under load.
The 8900 series is steel construction with a zinc-plated finish — the industry standard for side-mount ball bearing slides in commercial and industrial settings. Zinc plating protects the steel members through years of hard indoor use. This is a functional, working finish: it handles the environment without pretending to be decorative hardware. The zinc tone reads neutral against most cabinet interiors, which matters less when the slide is beside an open drawer than when it disappears beneath one.
The 8900 series targets cabinet shops, contractors, and facility builders working on drawers that will carry real loads: machine parts, tools, files, or commercial equipment. The non-handed design and Bulk-Pack format make it practical for volume installs where sorting handed pairs slows the line down. The 3/4 inch side clearance per side is wider than the standard 1/2 inch most cabinet slides require, so the drawer box needs to be sized accordingly — build the box 1-1/2 inches narrower than the cabinet opening. In face-frame cabinets, rear mounting support is required; add the appropriate series-matched rear brackets, sold separately.
Per pair. That is the working rating for one complete drawer installation with one slide on each side.
Yes. Most side-mount ball bearing slides in the 100 lb class use 1/2 inch clearance per side. This 8900 series slide requires 3/4 inch per side, so build the drawer box 1-1/2 inches narrower than the cabinet opening rather than the usual 1 inch.
No. The 8900 series uses standard motion — no closing mechanism of any kind. The drawer stays open or closed wherever it is left. If you need a closing feature at this load class, look for a model that specifically names soft-close or self-close in its specs.
Full extension means the intermediate member lets the drawer travel approximately the full 20 inch slide length, bringing the drawer completely clear of the cabinet opening. The entire drawer interior is accessible without pulling the drawer out by hand.
No. The 8900 series is non-handed — both slides in the pair are identical, and either one installs on either side of the drawer.
When the spec calls for full extension, a 500 lb capacity, and a zinc finish that holds up in a working shop, the 8900 series in 20 inches delivers without asking anything extra of the installer.
Sold In: 1 Set
