We had slightly over 10,000 pieces of the custom flat stamped nuts manufactured using mild steel material with zinc clear finish. Outside dimensions measured 22.86mm X 16mm with thickness set to 6mm. M8-1.25 6h thread was tapped with its center approximately 5.6mm from the edge of the nut. 6mm is probably the maximum thickness to allow stamping for this size nut without exhibiting too much variation in thickness along the profile.