Value Collection R63640244 Carriage Bolt 5/16-18 2-1/2 in

Product Description

The VALUE COLLECTION R63640244 is a 5/16-18 UNC carriage bolt designed for secure fastening in structural and mechanical assemblies. The square neck under the domed head locks into wood or soft material to prevent rotation during tightening, eliminating the need for a wrench on the bolt side. Manufactured from Grade 18-8 stainless steel with an uncoated finish, this bolt resists corrosion in wet, outdoor, and mildly chemical-exposed environments. The 2.5-inch length under head suits medium-depth through-bolt applications. Installers across HVAC, plumbing, electrical, and general construction trades use this bolt where both corrosion resistance and a clean finished appearance are required.

This carriage bolt is suited for residential and light commercial fastening applications including equipment mounting, structural wood connections, racking systems, and pipe support assemblies. The 5/16-18 thread size is a common standard in trade installations where UNC fasteners are specified. The uncoated Grade 18-8 stainless steel construction makes it appropriate for outdoor, coastal, or damp-environment installations where carbon steel fasteners would be prone to rust and premature failure.

Key Features

• 5/16-18 UNC thread for compatibility with standard nuts and tapped components
• Square neck locks into substrate to prevent bolt rotation during installation
• Grade 18-8 stainless steel construction provides corrosion resistance in wet and outdoor environments
• Uncoated finish with no plating to degrade or introduce galvanic incompatibility with stainless hardware
• 2.5-inch length under head accommodates medium-thickness material stacks

Compatibility

Designed as a standard UNC carriage bolt for use with 5/16-18 nuts and washers in wood, metal, and composite fastening applications requiring a stainless steel fastener.

Installation Notes

Carriage bolts are typically installed by tradespeople and general contractors using standard hand tools. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and prevent rotation, then secure with a compatible 5/16-18 nut and washer on the opposite face. Do not use an impact driver directly on the domed head. Torque the nut to the value specified by the project engineer or applicable structural code — no torque value is specified for this fastener in the supplied data.