Value Collection 489048PS Carriage Bolt 5/16-18 2 in Square Neck

Product Description

The VALUE COLLECTION 489048PS is a 5/16-18 UNC carriage bolt with a 2-inch length under head and a square neck design. Manufactured from Grade 2 steel with a zinc-plated finish, this fastener meets ASTM A307 standards. The square neck seats into pre-drilled material to prevent rotation during installation, eliminating the need for a wrench on the bolt head. Commonly used in wood-to-wood and wood-to-metal connections, this bolt is a standard option for light structural and general assembly applications across construction, HVAC equipment mounting, and utility installations.

This carriage bolt is suited for general construction, light structural framing, equipment mounting, and wood assembly work. The 5/16-18 UNC thread pattern is a widely used inch-series thread, making hardware and nut compatibility straightforward. The zinc-plated finish provides moderate corrosion resistance for indoor and sheltered outdoor environments. Installers working on HVAC curb mounting, equipment bases, or general trade work will find this a practical, code-compliant fastener option.

Key Features

• 5/16-18 UNC thread size for broad nut and hardware compatibility
• 2-inch length under head suits standard wood and light metal assemblies
• Square neck prevents bolt rotation during tightening without a second wrench
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish provides moderate corrosion resistance in sheltered environments

Compatibility

Designed as a standard inch-series carriage bolt for general assembly and light structural applications requiring a 5/16-18 UNC thread and 2-inch under-head length.

Installation Notes

Installation is typically performed by carpenters, general contractors, or trade mechanics using standard hand tools. Drill a clean through-hole sized to match the bolt shank so the square neck seats flush and locks against rotation. Thread a compatible 5/16-18 nut and washer onto the exposed end and tighten to the joint requirements of the applicable building code or equipment manufacturer guidelines. Do not use in direct-burial or continuous-immersion applications where the zinc coating may be insufficient for the corrosion environment.