5/8"-11 x 5 (18-8) Stainless Steel Carriage Bolt, Full Thread, 25 EA - by, LLC$$Hardware

18-8 Stainless Steel Superior Corrosion Resistance Excellent for Outdoor and/or Marine Applications where corrosion is a concern Round Head for Smooth Finish Full Thread Exceeds ASTM F593; ASME B18.5 Standards Tensile Strength: 100,000-150,000 PSI Yeild Strength: 65,000 PSI Rockwell Hardness: B95-C32 Head Diameter: 1-1/4"You may also like 3/8" x 8" (50 Pack) Galvanized Lag Screw Kit Grade A, Includes: 3/8" USS Flat Washers (50 pc) - Hot Dip Galvanized for Exterior Use - by, LLC.