Value Collection CAI503102500-100BX Carriage Bolt 5/16-18

Product Description

The VALUE COLLECTION CAI503102500-100BX is a 5/16-18 UNC carriage bolt with a 2.5-inch length under head and a square neck profile. The square neck seats into pre-drilled holes in wood or soft materials, preventing rotation during installation without requiring a wrench on the bolt head. The fastener is manufactured from Grade 5 steel and finished with a zinc plating that provides baseline corrosion resistance for general interior and light exterior applications. It ships in a box of 100, making it well-suited for contractors, maintenance crews, and tradespeople who install these fasteners in volume.

This carriage bolt is used in wood-to-wood and wood-to-metal connections across residential construction, light commercial framing, equipment mounting, and general mechanical assembly. Typical applications include deck construction, fence post hardware, structural bracing brackets, and equipment frames where a clean, round-headed fastener is required on the exposed face. The 5/16-18 thread size is a common specification for framing connectors, hinges, and utility hardware found throughout trade work.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard nuts and threaded hardware
• 2.5-inch length under head accommodates typical stacked-material assemblies
• Square neck prevents bolt rotation during tightening without a secondary tool on the head
• Grade 5 steel construction provides higher tensile strength than Grade 2 fasteners
• Zinc-plated finish offers corrosion resistance for general-purpose use
• Sold in a box of 100 for volume installation jobs

Compatibility

Designed as a standard 5/16-18 UNC carriage bolt suitable for use with any matching 5/16-18 hex nut, coupling nut, or threaded insert in wood, composite, or light-gauge metal applications.

Installation Notes

Installation is performed with a standard wrench or socket on the nut end — the square neck locks into the material so no tool is needed on the bolt head. Drill a clean hole sized to allow the square neck to pull flush and seat fully into the substrate. Follow applicable building codes, including the International Building Code or IRC where structural fastener specifications apply. Verify material grade and coating requirements against the project specification before installation, particularly in treated lumber applications where more corrosion-resistant coatings may be required.