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.
The pressure output in pounds per square inch (PSI) of the device is a factor in determining the kind of duties it can efficiently handle. Light-duty pressure washers are rated below 2000 PSI. They work best for cleaning patio furniture and siding as well as cars, trucks and boats.