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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 distinction comes as a result of the load applied when torquing the bolt or screw. The object of using a tooth lock washer is to press the teeth into the joint material. Based on the head shape and point of contact with the washer below, internal or external tooth washers provide the ideal fit.