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This is a 20 inch full-extension side-mount ball bearing drawer slide from Knape and Vogt's 8908 series, rated 500 lb per pair in a bright zinc finish, with both hold-in and hold-out detents that lock the drawer in the closed and fully open positions until intentionally moved.
At 500 lb per pair, the 8908 series operates in a completely different class from standard 75–100 lb cabinet slides. Shop tool drawers, commercial parts bins, server room chassis, and industrial storage units all benefit from this load class. The hold-in detent is particularly valuable in these settings: a loaded drawer closing with any momentum will stay shut rather than rebounding open and creating a hazard. The hold-out detent complements that by keeping the drawer stationary at full extension — no hand needed to brace it while the other hand retrieves contents. Full extension means the drawer member travels the full 20 inch slide length, bringing the rear of the box all the way out to the cabinet face.
The zinc finish on the 8908 series is an electroplated coating over cold-formed steel — the standard corrosion-resistant surface for side-mount ball bearing slides used indoors. On a 500 lb-class slide the steel members are substantially heavier gauge than what you find in the standard cabinet range, and the zinc protects that investment through years of hard use in shops, warehouses, and service facilities. Zinc is a functional finish; it does not have the decorative contrast of the black-finish variant or the clinical brightness of stainless, but it blends cleanly with zinc-finished cabinet hardware and standard shop interiors. This is the right finish choice when the priority is durability and consistency with other zinc-finished fittings in the installation.
This slide is the right call when a standard-class BB slide would be undersized and the application demands detent control in both positions. Machine shops and tool cribs running heavy equipment drawers, commercial kitchens with deep storage drawers, fleet maintenance bays with loaded parts drawers, and any institutional installation where drawers must not drift open or slam back — these are the environments the 8908 series was sized for. The non-handed design matters at scale: ordering a single SKU per drawer count rather than sorting left and right members cuts both purchasing complexity and bench time. Note that this slide requires 3/4 inch of side clearance per side, so the drawer box must be built 1-1/2 inches narrower than the cabinet opening. In face-frame cabinet installations, rear mounting support is required; confirm rear bracket compatibility for the 8908 series before ordering.
Hold-in keeps the drawer closed and stops it from bouncing back open when shut firmly. Hold-out keeps the drawer stationary at the fully open position so you do not need a hand to brace it. Neither feature is a lock — both release with a normal pull or push.
500 lb is the rating per pair. That is the working capacity for one drawer running on two slides, one on each side.
The slide length is 20 inches, and full extension means the drawer member travels approximately that full length — bringing the entire drawer out to the cabinet face. Slide length and travel are the same number on a full-extension slide, but they are two separate facts: the slide length is the closed dimension you match to your cabinet depth, and full extension tells you the drawer will clear the opening completely.
Side-mount slides in face-frame cabinets need rear support because the cabinet side is set back from the face frame. Rear mounting brackets are required for face-frame installs; confirm bracket compatibility for the 8908 series with your supplier before ordering.
No. The 8908 series is non-handed — both slides in a pair are identical and either one fits either side of the drawer.
The 8908 series in zinc gives demanding installations a heavy-rated, detent-controlled slide that stays where it is put — closed when it is closed, open when it is open — without adding hardware complexity or requiring left-right sorting on the job.
Sold In: 1 Each
