316 stainless steel is ideal where superior corrosion resistance is required

you never have to worry about TimberLOK® Heavy Duty Wood Screws due to their ability to fight corrosion

7/16-20 x 5 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (25)

1/2-13 x 3 Grade 8 Hex Cap Screw Plain Domestic USA (200)

2 1/2-4 A194 2H Heavy Hex Nut Plain 7/8-9 Grade 5 Hex Cap Screws Zinc Plated 316 stainless steel is ideal2 1 2 4 A194 2H Heavy Hex Nut Plain . A194 2H Heavy Hex Nuts are manufactured from 1045 steel to meet or exceed ASTM A194 Grade 2H. Hot Dip Galvanized material will meet or exceed ASTM A153 and or ASTM F2329. Galvanized nuts are over tapped per ASTM A563. Typical hardness is HRC 24 35 for diameters up to 1 1 2 inches, HRB 95 HRC 35 for diameters over 1 1 1 2 inches. Proof load strength is 175,000 psi.