5/16" x 3" Hot Dip Galvanized Grade 307A Carriage Bolt Kit, 50 Pack, Comes with 5/16" USS Flat Washers & 5/16"-18 Hex Nuts, Heavy Duty Exterior Construction Use

Multiple Size Options: Available in 5/16"1", 1-1/2", 2", 2-1/2", and 3" lengths to fit various wood thicknesses, ideal for decks, fences, gazebos, pergolas, and all outdoor projects. | Complete All-In-One Kit: Each set includes carriage bolts, thick washers, and hex nuts. No extra parts needed, ready to use right out of the box. | Long-Lasting Rust & Corrosion Resistance: Hot dip galvanized finish offers excellent weather and corrosion resistance, works with ACQ treated lumber, perfect for all outdoor conditions. | Smooth, Clean Flush Finish: Flat head design creates a semi-flush surface with no sharp edges, keeping your projects neat, safe, and visually appealing. | Secure, Anti-Slip Installation: Square neck prevents spinning during installation; coarse UNC threads provide strong grip to avoid stripping or loosening over time. | Quality Meets Industrial Standards: Complies with ASME and ASTM specifications, durable enough for heavy-duty outdoor use.