Value Collection CAI203108000-050BX Carriage Bolt 5/16-18 8in

Product Description

The VALUE COLLECTION CAI203108000-050BX is a 5/16-18 UNC carriage bolt with an 8-inch length under head and a square neck, manufactured from Grade 2 steel with a zinc-plated finish. Carriage bolts are used to fasten wood to wood or wood to metal, with the domed head sitting flush on the surface and the square neck locking into the substrate to prevent rotation during tightening. This bolt meets ASTM A307 fastener standards and is sold in a box of 50 units. Installation is straightforward and does not require a wrench on the bolt head, making it a common choice for framing, decking, and structural assembly applications.

This carriage bolt is suited for general construction, light structural, and woodworking applications where a clean, low-profile head is needed. The zinc coating provides basic corrosion resistance for dry or mildly exposed environments. The 5/16-18 UNC thread size and 8-inch shank length make it appropriate for fastening thick lumber assemblies, fence construction, playground equipment, and similar projects. It is typically installed by carpenters, general contractors, and maintenance tradespeople working with wood-framed structures.

Key Features

• 5/16-18 UNC thread for compatibility with standard inch-series nuts and hardware
• 8-inch length under head accommodates thick material stacks
• Square neck prevents bolt rotation without a secondary tool on the head
• Grade 2 steel construction meets ASTM A307 fastener standard
• Zinc-plated finish provides basic corrosion resistance in dry or sheltered environments
• Sold in a minimum order quantity of 50 bolts per box

Compatibility

Designed for use with standard 5/16-18 UNC hex nuts and flat or fender washers in inch-series fastener applications. Suitable for wood-to-wood and wood-to-metal assemblies where a flush domed head is required.

Installation Notes

Installation is performed by driving the bolt through a pre-drilled hole sized to allow the square neck to seat flush and lock against rotation in the substrate. A standard wrench or socket is used to tighten the mating nut on the opposite side. Always pre-drill to the correct diameter to avoid splitting the workpiece. Follow applicable building codes for structural fastener spacing and load requirements when used in load-bearing assemblies.