Rivetking SBUP-4/P500 Blind Rivet Backup Washer 500 Pack

Product Description

The RIVETKING SBUP-4/P500 is a round blind rivet backup washer designed to distribute clamp load and protect the workpiece surface during blind rivet installation. Sized for 1/8-inch rivet diameter (Size 4), each washer measures 0.125 inches inside diameter, 0.375 inches outside diameter, and 0.0625 inches thick. Constructed from zinc-plated steel, the finish provides corrosion resistance in light-duty environments. These washers are used by sheet metal workers, HVAC installers, electricians, and general trade contractors wherever added bearing surface is needed behind a blind rivet. Each package contains 500 pieces.

Blind rivet backup washers are applied on the blind side of a joint to spread load across thin or soft substrates, oversized holes, or soft materials that would otherwise allow the rivet mandrel head to pull through. Typical applications include ductwork assembly, electrical enclosure fabrication, equipment panels, and structural sheet metal work. The 500-piece quantity is suited for ongoing production or field service use where consistent supply is needed.

Key Features

• Sized for 1/8-inch diameter blind rivets (Size 4)
• 0.375-inch outside diameter distributes clamp load over a wider bearing area
• 0.0625-inch thickness provides a low-profile fit in tight assemblies
• Zinc-plated steel construction for corrosion resistance in light-duty service
• 500-piece package quantity reduces reorder frequency on active job sites

Compatibility

Designed for use with standard 1/8-inch diameter (Size 4) blind rivets in sheet metal, ductwork, electrical enclosure, and general fabrication applications.

Installation Notes

Installation is performed by placing the backup washer over the rivet stem on the blind side of the workpiece before setting the rivet with a standard rivet tool. Ensure the hole diameter is properly sized to match the 0.125-inch inside diameter of the washer to maintain correct alignment. Wear appropriate eye protection when operating rivet tools. Verify material and joint requirements before selecting fastener hardware for structural applications.