Value Collection KP7931 Blind Rivet Backup Washer 50 Pack

Product Description

The VALUE COLLECTION KP7931 is a round blind rivet backup washer made from plain aluminum, sold in a 50-piece package. Backup washers are used in blind rivet installations to distribute clamping load and prevent pull-through on soft, thin, or oversized hole substrates. The KP7931 is sized for use with 1/4-inch diameter blind rivets and measures 0.26 inches inside diameter, 0.5 inches outside diameter, and 0.06 inches thick. The plain aluminum finish offers adequate corrosion resistance for general-purpose indoor and sheltered applications. Installation of these washers is performed by sheet metal workers, HVAC technicians, and general fabricators during panel assembly and ductwork fastening tasks.

This washer is suited for residential and light commercial applications where blind rivets are used to join sheet metal panels, ductwork sections, equipment enclosures, or similar thin-gauge assemblies. The 0.5-inch outside diameter provides a wide bearing surface relative to the 1/4-inch rivet shank, helping secure fasteners in materials prone to deformation under pull-through load. The 50-piece package quantity makes this item practical for service van stocking and small-batch fabrication work.

Key Features

• Sized for 1/4-inch diameter blind rivets with 0.26-inch inside diameter
• 0.5-inch outside diameter distributes clamping load across a wider surface area
• 0.06-inch thickness provides consistent bearing surface without adding significant stack height
• Plain aluminum construction resists corrosion in general indoor and sheltered environments
• 50-piece package quantity suits service stock and small fabrication runs

Compatibility

Designed for use with 1/4-inch diameter blind rivets in general sheet metal, ductwork, and light fabrication applications where backup support is required at the blind side of the joint.

Installation Notes

Place the backup washer on the blind side of the workpiece before setting the rivet, ensuring the washer seats flat against the substrate surface. Power down or de-energize any equipment being serviced before fastening panels or enclosures. A standard rivet gun or pneumatic rivet tool is used for installation. Follow applicable sheet metal and mechanical assembly guidelines for proper rivet spacing and edge distance.