FASTENER MATERIAL STEEL Zinc Plated STAINLESS STEEL Type 410 STAINLESS STEEL Type 302, 304, 316 ALUMINUM BASE METAL Zinc | Galvanized | ZN/Al Coated Steel A C C B Aluminum A 1Not Recommended B A Steel / Cast Iron A,D C B A Brass, Copper, Bronze A,D,E A B A,E Stainless Steel 300 Series A,D,E A A A,E Footnotes 1.