The Spherical Washer with Conical Seat is a two-piece set — a convex spherical washer that nests into a concave conical seat. Together, they allow the clamping nut to self-align when the clamp surface isn’t perpendicular to the stud axis.

This matters on angled setups, tapered workpieces and any fixture where the clamp can’t sit perfectly flat. Without alignment compensation, the nut loads one edge of the clamp harder than the other, causing uneven clamping and potential workpiece shift under cutting forces.