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This is a 30 inch full-extension side-mount ball bearing drawer slide from Knape and Vogt's 8908 series, rated 500 lb per pair, with both hold-in and hold-out detents for drawers that must stay put in either position. The zinc finish brings proven indoor corrosion resistance to a slide built well beyond the standard cabinet class.
A 500 lb rating per pair belongs in drawers that no standard cabinet slide has any business carrying: machine shop tool drawers loaded with chucks, arbors, and heavy tooling; maintenance carts with packed steel parts bins; commercial workbenches with deep drawers holding full sets of wrenches and sockets; and industrial storage units that sit on the floor and take daily abuse. The hold-in detent means the drawer does not bounce back open after a firm close, even when the contents shift on impact. The hold-out detent keeps the drawer extended while both hands are occupied at the bench — no prop stick required, and no risk of the drawer rolling shut mid-task. Full extension at 30 inches brings every inch of a deep drawer box out to the cabinet face, so reaching to the back is never a problem.
Zinc electroplating is the workhorse finish for heavy-gauge steel drawer slides operating in dry indoor environments: machine shops, cabinet shops, tool rooms, and utility storage areas. It protects the steel members from surface oxidation without adding a painted layer that can chip under load or abrade against the drawer box. On a slide this size and capacity, the finish is functional rather than decorative — it will be mostly hidden beside the open drawer. This is an indoor finish; it is not rated for wet, washdown, or exterior applications.
The 8908 series is not a kitchen or office slide. It is specified by facilities managers outfitting industrial workstations, shop owners building heavy tool storage, and contractors installing commercial cabinetry where the duty cycle and the contents are both well beyond residential scale. The 3/4 inch side clearance per side is wider than the 1/2 inch standard, so drawer boxes must be built to this dimension — 1-1/2 inches narrower than the cabinet opening in total. In face-frame cabinet installations, rear mounting support is required; add the appropriate series-matched rear mounting brackets, sold separately. This SKU ships as a bulk-pack; confirm the pack quantity at checkout.
Hold-in is a mechanical detent that keeps the drawer closed and prevents it from bouncing back open after a firm push. Hold-out is a separate detent that holds the drawer fully extended until you intentionally push it back in. Both are passive mechanical catches — neither is a spring-close nor a soft-close damper.
500 lb is the rating per pair — one slide mounted on each side of the drawer. That is the working capacity for the installed drawer.
The 8908 is a heavy-duty slide with a larger cross-section than standard cabinet slides. It requires 3/4 inch of side clearance per side, so the drawer box must be built 1-1/2 inches narrower than the total cabinet opening. Using standard 1/2 inch clearance will result in a drawer box that is too wide to seat the slides.
No. The 8908B 30 is non-handed — both slides in the pair are identical and either one fits either side of the drawer.
It can, but face-frame installations require rear mounting support at the back of the slide. Use series-matched rear mounting brackets, sold separately, to carry the load properly in that construction.
When the drawer carries serious weight and needs to stay exactly where it is put — open or closed — the 8908 series in zinc is built for that job. Match the 3/4 inch clearance to your drawer box and this slide is ready for the long haul.
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