Simpson Strong-Tie. An improved mudsill anchor design provides contractors with a replacement for 1/2- and 5/8-inch anchor bolts. Key areas of the MASA mudsill anchor have been reinforced, and fasteners have been added. This allows the anchor to be installed as wide as 6-feet-on-center, so users can achieve the same load capacity with fewer mudsill anchors. MASA mudsill anchors attach easily to concrete forms and lay flat on top of the form board, eliminating the need to finish around anchor bolts. No plate drilling is required, and the MASA also fulfills IRC and IBC requirements for 3-inch square plate washers. 800.999.5099.