Abstract: A washer includes a domed central portion with a central opening establishing a longitudinal axis, a base wall extending in a direction radially outwardly from the axis, and an extension wall extending in a direction radially outwardly and axially away from the base wall. The washer also includes a curled radially outer periphery with a peripheral wall extending radially outwardly from the extension wall and in a direction axially away from the extension wall back toward the base wall. A fastener assembly includes the washer and a fastener having a shank extending through the central opening of the central portion. A fastener arrangement includes the fastener assembly and an object to which the fastener assembly is fastened. A product, and a related method, include a panel carried by an underlying support structure to which the shank of the fastener assembly is coupled, with the curled radially outer periphery engaging the panel.