How thick is the ArcFlat? June 14, 2021 23:28 The ArcFlat has top thickness of 3/8" and side wall thickness of 5/16" Related articles Can I pick up my ArcFlat from Langmuir Systems? What is the precision leveling bolt kit? Do I need it? Can I finance the purchase of the CrossFire XR? Casting Void Do ArcFlat blocks ship internationally?