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Backup washers, intended for use with blind (POP) rivets, give extra support when fastening soft materials and in applications that require a larger diameter surface to prevent pull-out. They can be useful when working with oversized or irregular shaped holes.
Washer size refers to its nominal hole size and is based on blind rivet size. Its outside diameter (OD) is always larger. Like blind rivets, backup washer size is specified in fractional inches.
Available in aluminum and steel, backup washer material is usually matched to the blind rivet material—use aluminum backup washers with aluminum blind rivets, etc.