Simpson Strong-Tie S16ACNB - 3-1/2 x. 162 Ring Shank 8Ga 304SS 1100ct. Simpson Strong-Tie S16ACNB 3-1/2 x. Annular ring shank increases withdrawal resistance to provide a secure attachment. Stainless-steel nails are recommended for construction of permanent wood foundations by the. ANSI/AF&PA Permanent Wood Foundations Design Specifications. Choose Type 316 stainless steel for seaside applications and superior corrosion resistance.