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Knape and Vogt 18 inch drawer slides give file drawers full extension travel, so the drawer opens its full length and exposes stored files for direct access during daily use. As a side mount drawer slide, this 8520 Series model fits into standard side-mount layouts, which simplifies planning on cabinets already designed around side clearance. The slide is a full extension file drawer slide with over travel, so the drawer moves slightly beyond its length, improving visibility and reach into the back area of the drawer. An over travel hold-in anti-rebound feature keeps the drawer held in at the closed position, which helps prevent bounce back in busy office or shop environments. The design is unhanded, so the same 18 inch member works on either side, supporting straightforward layout and installation on production runs or repeat jobs.
This Knape and Vogt 18 inch drawer slide is a side mount design, so it mounts to the cabinet sidewalls and drawer sides in typical file drawer constructions. Side clearance is 1/2 inch plus 1/32 inch minus 0 inch each side, giving a defined clearance window for sizing drawer boxes in relation to the cabinet opening. The slide height is 3-51/64 inch including the quick disconnect rail, which helps with planning vertical drawer spacing in file banks. A 32 mm pattern is present, so the slide has holes arranged on that pattern, supporting layouts built around 32 mm cabinet construction. Direct access mounting holes are provided, giving straightforward screw engagement into cabinet sides or drawer members where that pattern falls. The recommended fasteners are #7 x 5/8 inch Phillips pan head screws (BST5/8X7-2C), aligning slide hole size to a fastener length suited for typical cabinet side thicknesses.
The 8520 Series full extension file drawer slide is suited to file drawer applications where full access to files is expected on each cycle. Being a side mount drawer slide, it fits cabinets designed with side-mounted hardware and defined side clearances around the drawer box. The side clearance of 1/2 inch plus 1/32 inch minus 0 inch each side directs how wide to build the drawer relative to the opening when laying out file storage. Height of 3-51/64 inch including the quick disconnect rail impacts how many vertical tiers of drawers can be stacked in a given case height. A 32 mm pattern on the members aligns with construction that follows that drilling system, supporting quicker layout in shops that use 32 mm casework. Non-handed quick disconnect drawer members allow the same slide components to be used on left and right, which is useful when building multiple cabinets with repeated drawer sizes.
This Knape and Vogt slide uses progressive movement on ball bearings, so as the drawer moves out, bearing stages engage in sequence and keep motion smooth through the stroke. The metal ball retainer holds 3 bearings per inch, so the bearing train remains dense along the slide length and helps distribute loads evenly during opening and closing. Positive in and out stops are built into the slide, setting clear travel limits at open and closed positions and limiting over-travel beyond designed points. An over travel design with a hold-in feature keeps the drawer seated when closed and allows slightly past-full extension when open, which improves both retention at rest and access at the back. The extended Z-plate formed from high-strength steel alloy provides additional structural support, helping the slide resist side loads within normal file-drawer use. Direct access mounting holes and the secondary quick disconnect lock combine to keep drawer members located consistently once positioned on the cabinet and drawer sides.
The 8520B 18 is a Knape and Vogt 8520 Series full extension file drawer slide, so it is designed to let file drawers open their full length for access to stored files.
The 18 inch slide provides over travel beyond full extension, so the drawer front moves slightly farther out, improving reach and visibility into the back of the file drawer.
The hold-in anti-rebound feature keeps the drawer held at the closed position, which helps prevent the drawer from bouncing open after being pushed shut.
This 18 inch side mount slide uses 1/2 inch plus 1/32 inch minus 0 inch clearance on each side, which guides the relationship between drawer width and cabinet opening.
The recommended fasteners for the 8520B 18 are #7 x 5/8 inch Phillips pan head screws (BST5/8X7-2C), which match the direct access mounting holes in the slide members.
The 18 inch 8520 Series slide has a height of 3-51/64 inch including the quick disconnect rail, which helps in planning vertical drawer spacing within a cabinet.
The Knape and Vogt 18 inch drawer slides 8520B 18 combine full extension, over travel, and a hold-in anti-rebound feature, giving file drawers defined travel and controlled closure. Side mount configuration with 1/2 inch plus or minus 1/32 inch side clearance supports cabinets sized to that relationship between drawer and opening. A 32 mm pattern and direct access mounting holes help align this slide with casework built around that drilling system. Progressive ball bearing movement with 3 bearings per inch and an extended Z-plate in high-strength steel alloy supports smooth, guided motion over the 18 inch length. For file drawers that need reliable full-length access and consistent operation, this 8520 Series Knape and Vogt option provides a defined set of mounting and motion characteristics.
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