Coarse Thread Superior Corrosion Resistance Hot Dipped Galvanized Finish Grade A 307 Partial 2" of Thread 40 USS Flat Washers, 20 Hex Nuts and 20 Split Lock Washers Included in kit Minimum Tensile Strength: 60,000 Psi RoHS Compliant Specifications Met: ASTM F2329/F2329M or ASTM A153/A153M Minimum Coating Thickness: Coating thickness for sizes 3/8 “ & under : 0.0017” (43 microns) Coating thickness for sizes over 3/8“ : 0.0020” (50 microns) Hex Bolts are made of low carbon steel, these fasteners are applicable for most low strength commercial and industrial uses. Galvanized plating protects the bolt from corrosion; typically used in outdoor applications.