Spherical washers are designed for creating an exact, parallel plane between the bolt head and the face of the nut. The spherical design allows them to automatically adjust and compensate for the angular deviation between these planes. They also reduce bolt fatigue and prevent bending occurrences. These washers are offered in thicknesses ranging from 3/16 - 1/2 In & 4.2 - 19.2 mm at a maximum tolerance rating of +/-0.2 mm. We supply a wide range of these spherical washers available in stainless-steel, low-carbon steel and steel material options.