This 1″ x 3 1/4″ UNF (Unified Fine Thread) hex bolt is crafted from high-strength Grade 8.8 steel and coated with a zinc plating (BZP) for enhanced corrosion resistance. With its reliable performance and protection against rust, this hex bolt is suitable for both indoor and outdoor use, ensuring durability in a variety of environments. Choose this Grade 8.8 zinc-plated hex bolt for your heavy-duty fastening needs.