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20 inch over travel drawer slide describes this Knape and Vogt Model 8505B 20 side mount ball bearing file drawer slide, so installers get a clear match for 20 inch file drawer projects. The slide is a side mount drawer slide, which lets it work in standard file drawer cabinet designs where the slide mounts to the cabinet side. It is part of the 8505 Series, so it matches projects already using this series for consistent hardware selection on multi-drawer runs. The slide is unhanded, meaning the same member works on either side of the drawer, which helps simplify layout and reduces separate left/right inventory. A ball bearing design is used, so the drawer travels on ball races instead of friction surfaces, giving smoother movement when opening and closing loaded file drawers. This model is identified as a file drawer slide, which aligns it with deeper drawers often used for files in commercial or shop cabinetry.
The 1/2 inch plus 1/32 inch minus 0 inch side clearance per side gives a defined total clearance, which helps cabinetmakers build drawer boxes that run smoothly without excess side play. The quick disconnect drawer members are noted as factory-attached drawer release clips, so the drawer member can disengage from the cabinet member, which simplifies installing and removing drawers during fitting or later service. Recommended fasteners are #7 x 5/8 inch Phillips pan head screws, so drilling and driver setup can be chosen around this size when preparing to mount the slide. The progressive movement on ball bearings is specified, meaning the ball-bearing action stages the members, which gives a more controlled feel across the full travel when sliding the drawer in and out.
This Knape and Vogt 8505B 20 slide is described as a file drawer slide, aligning it with cabinets where deeper drawers support file storage or similar loads. The side mount design positions the cabinet member on the cabinet wall and the drawer member on the drawer side, fitting typical shop-built file drawers. The 20 inch length targets drawer depths built to accommodate standard file sizes, so the drawer can extend to provide reach to stored contents. The 3-51/64 inch height gives a taller profile than light-duty slides, which fits installations where the slide edge aligns with taller drawer sides or structural rails. The 32 mm pattern supports cabinets drilled on a 32 mm system, so this slide can mount directly to line-bored holes without extra layout steps. The anochrome finish provides a consistent look with other anochrome Knape and Vogt hardware in an office or shop installation.
The hold-in feature is specifically designed to prevent bounce back, so when the drawer is pushed closed on this model, the mechanism resists the drawer drifting back open, which is valuable in file drawers that are opened and shut frequently. Positive in and out stops are built into the slide, so travel limits are controlled by the hardware, helping protect both the slide members and the cabinet from over-travel impacts. The over travel action lets the drawer extend beyond nominal full extension, which brings the rear of the file drawer further out of the cabinet and improves access to files at the back. The retainer holds 3 bearings per inch of race, so the ball bearings are spaced densely along the slide, supporting smooth and quiet motion along the full stroke. Progressive movement on ball bearings means the members engage in sequence, which smooths the hand feel and can help keep heavier file drawers moving steadily.
The Knape and Vogt 8505B 20 is identified as a file drawer slide, so it is intended for deeper file-style drawers often used in office or cabinet installations.
The 8505B 20 uses 1/2 inch plus 1/32 inch minus 0 inch side clearance on each side, guiding drawer box width so the slide runs smoothly in the cabinet opening.
The product is a side mount drawer slide, so the slide mounts to the cabinet sides and drawer sides, fitting typical side-mounted file drawer constructions.
The hold-in feature is designed to prevent bounce back, so once closed, the file drawer is less likely to drift open during normal cabinet use.
Recommended fasteners for mounting the 8505B 20 are #7 x 5/8 inch Phillips pan head screws, guiding bit selection and pilot hole preparation.
The over travel design lets the drawer extend beyond standard full extension, so users gain better access to files stored at the rear of the drawer.
The Knape and Vogt 20 inch over travel drawer slide 8505B 20 combines side mount installation, file drawer intent, and hold-in anti-rebound function, which aligns with commercial and shop projects that need controlled file drawer movement. The specified 1/2 inch plus 1/32 inch minus 0 inch side clearance and 3-51/64 inch height give the sizing details needed to design or match drawer boxes. With progressive ball-bearing movement, positive stops, and a 32 mm pattern, this slide supports efficient layout and repeatable action across multiple drawers. Use this model wherever a 20 inch, over travel, anochrome-finished file drawer slide from the 8505 Series is required for consistent cabinet builds.
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