Simpson Strong-Tie T40ACNB - 5 x. 203 Ring Shank 6Ga 316SS 95ct. Simpson Strong-Tie T40ACNB 5 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.