The Anahuac Mayab University is a private institution of Catholic inspiration founded in 1984.
They are used in the same applications as fender washers. A spherical washer is part of a self-aligning nut; it is a washer with one radiused surface, which is designed to be used in conjunction with a mating nut in order to correct for up to several degrees of misalignment between parts.
This finishing washer, also called a trim or cup washer, has an increased bearing surface and the cupped design gives a clean finished appearance. It is round with a hole in the middle and can dress up a project while mostly hiding the appearance of the screw. The washer is designed for use with flat or oval head screws.