Grade 8 Zinc Yellow Plated Carriage Bolts deliver exceptional strength for demanding wood-to-wood and metal-to-wood assemblies. Sized at 5/16-18 x 4, these bolts combine a high-strength Grade 8 steel core with a durable zinc yellow finish to resist corrosion in indoor and outdoor environments.

Designed with a domed head and square neck, they grip the workpiece to prevent turning during tightening, ensuring fast, reliable assemblies every time.

Product Details

• Material: Grade 8 steel for high strength and durability.
• Finish: Zinc yellow plated for corrosion resistance and long service life.
• Size: 5/16-18 UNC thread, 4 inch length.
• Head: Domed carriage bolt head with square neck to prevent turning in wood.
• Applications: Wood-to-wood assemblies, furniture, cabinetry, decking, and other heavy-duty projects.
• Compatibility: Use with corresponding nuts and washers as needed.

Installation tip: Align the pieces, insert the carriage bolt, and tighten with a nut on the opposite side. The square neck bites into the wood to resist turning, keeping your project square and secure.