Spherical washers are used as a two-piece set to compensate for clamping surfaces or threaded studs that are uneven, non-parallel or non-perpendicular. These washers are sold separately.
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DIN 6319, Type C "Male Form" Convex spherical radius, used as the top washer in the set.
DIN 6319, Type D "Female Form" Concave radius seat, used as the bottom washer in the set.