Value Collection CAI503104000-050BX Carriage Bolt 5/16-18 4in

Product Description

The VALUE COLLECTION CAI503104000-050BX is a 5/16-18 carriage bolt with a 4-inch length under head, manufactured from Grade 5 steel with a zinc-plated finish. The square neck below the head bites into the material being fastened, preventing rotation during installation without requiring a wrench on the bolt itself. This fastener follows Unified National Coarse (UNC) thread standards and is sized for general structural and mechanical fastening applications. The zinc coating provides baseline corrosion resistance suitable for dry to mildly humid environments. Weight is 0.1 pounds per unit.

This carriage bolt is suited for wood-to-wood, wood-to-metal, and light structural assemblies common in construction, equipment mounting, and general trade work. The 5/16-18 UNC thread is a widely used size across residential and light commercial applications. Installers in HVAC, plumbing, electrical, and general mechanical trades use this fastener when a flush, snag-free bolt head is required on the accessible face of an assembly. Minimum order quantity is 50 pieces per order.

Key Features

• 5/16-18 UNC thread for broad hardware compatibility
• 4-inch length under head suits thicker material stacks and structural assemblies
• Square neck prevents bolt rotation during nut tightening, no back-tool required
• Grade 5 steel construction provides higher tensile strength than standard Grade 2 hardware
• Zinc-plated finish adds corrosion resistance for general indoor and sheltered outdoor use
• Rounded dome head delivers a clean, snag-free face on the exposed side of the fastener

Compatibility

Designed as a standard UNC carriage bolt for use with 5/16-18 nuts and washers in wood, metal, and composite assemblies where a non-rotating, round-head fastener is specified.

Installation Notes

Installation is performed by driving the square neck flush into a pre-drilled hole sized for the bolt shank, which locks the bolt against rotation. Tighten the mating nut from the opposite side using an appropriate wrench or socket. Follow applicable building codes and fastener torque standards for the specific structural application. Do not use in continuously wet or submerged environments where a higher corrosion-resistance finish would be required.