Grade 8 Zinc Yellow Plated Carriage Bolts 5/16-18X3 deliver rugged reliability for outdoor and indoor wood projects. Crafted from high-strength Grade 8 steel and finished with a durable zinc yellow plating, these carriage bolts combine superior shear strength with corrosion resistance, making them ideal for decks, fencing, timber framing, and furniture assemblies.

Designed for wooden connections, their domed head and square neck prevent rotation during installation, while the coarse 5/16-18 thread provides solid engagement in soft or hardwoods.

• Material: Grade 8 steel
• Finish: Zinc yellow plated for improved corrosion resistance
• Size / Thread: 5/16-18
• Length: 3 inches
• Head: Carriage bolt with domed head and a square undercut for locking into wood
• Applications: Wood-to-wood connections in decks, fences, timber framing, and furniture

Why choose Grade 8 zinc yellow plated carriage bolts?

Choosing Grade 8 bolts ensures you have one of the strongest fasteners for demanding wood projects. The zinc yellow finish offers a bright, corrosion-resistant barrier suitable for outdoor exposure, while the carriage bolt design reduces the need for nuts on the visible side of the assembly.

Installation tips

For best results, drill a clearance hole through the top board, thread a nut and washer on the opposite side if required, align the bolt, and tighten using appropriate tools. The square neck grips into the wood to prevent turning during tightening.