Rivetking SBUP-8/P500 Blind Rivet Backup Washer 500 Pack

Product Description

The RIVETKING SBUP-8/P500 is a round blind rivet backup washer designed to distribute clamping load and prevent pull-through on blind rivet installations. Manufactured from steel with a zinc-plated finish for corrosion resistance, this Size 8 washer accepts a 1/4 inch rivet diameter. It measures 0.625 inches outside diameter, 0.25 inches inside diameter, and 0.0625 inches thick. Packaged in a quantity of 500, this part is suited for production assembly, sheet metal work, and structural fastening tasks performed by electricians, HVAC technicians, plumbers, and general trade professionals who rely on blind rivets in panel and bracket installations.

Blind rivet backup washers are used wherever a standard rivet head footprint is insufficient to resist pull-through on soft, thin, or oversized holes in sheet metal, fiberglass, plastic panels, or similar substrates. The Size 8 designation corresponds to a 1/4 inch rivet shank, making this washer compatible with standard 1/4 inch blind rivets commonly used in HVAC cabinet fabrication, electrical panel mounting, plumbing support bracketing, and light structural assemblies. The 500-piece pack is appropriate for shop stock or ongoing production runs.

Key Features

• 1/4 inch inside diameter fits standard Size 8 blind rivets directly
• 0.625 inch outside diameter provides a wide bearing surface to reduce pull-through risk
• 0.0625 inch thickness keeps the washer low-profile within fastened assemblies
• Zinc-plated steel construction offers corrosion resistance in typical indoor and light-duty environments
• 500-piece quantity suits production and shop-stock applications

Compatibility

Designed for use with Size 8 blind rivets having a 1/4 inch shank diameter. Suitable as a backup or fender washer in standard blind rivet assemblies across HVAC, electrical, plumbing, and general sheet metal applications.

Installation Notes

Place the backup washer over the rivet shank on the blind side of the workpiece before setting the rivet, or use it on the head side to increase bearing surface as the application requires. Ensure the substrate and washer are properly aligned before actuating the rivet gun to avoid off-axis loading. No special tools beyond a standard rivet gun are required for installation.