Value Collection 489049PS Carriage Bolt 5/16-18 2-1/4 in Grade 2

Product Description

The VALUE COLLECTION 489049PS is a 5/16-18 UNC carriage bolt with a 2-1/4 inch length under head, manufactured from Grade 2 steel with a zinc-plated finish. The square neck below the domed head locks into wood or metal substrates to prevent rotation during fastening, eliminating the need for a second wrench on the bolt side. This bolt meets ASTM A307 standards and is suited for general-purpose structural and mechanical assembly work across construction, manufacturing, and maintenance applications. Available in minimum order quantities of 100 units per package.

This carriage bolt is used in residential and light commercial construction, woodworking, metal fabrication, and equipment assembly where a clean, rounded head profile is required on the exposed side of a joint. The square neck provides positive anti-rotation purchase in pre-drilled holes through wood, metal, or composite materials. Typical applications include deck construction, framing connections, machinery guards, conveyor structures, and trailer components where Grade 2 fastener strength ratings are acceptable per the design specification.

Key Features

• 5/16-18 UNC thread size for broad tool and hardware compatibility
• 2-1/4 inch length under head suits medium-depth through-fastening applications
• Square neck prevents rotation without tooling on the bolt side
• Grade 2 steel meets ASTM A307 fastener standard
• Zinc-plated finish provides baseline corrosion resistance for dry and semi-exposed environments
• Dome head delivers a smooth, flush-facing appearance on the non-nut side

Compatibility

Designed as a general-purpose replacement or new-installation carriage bolt compatible with standard 5/16 inch pre-drilled clearance holes in wood, steel, and composite assemblies where ASTM A307 Grade 2 fasteners are specified.

Installation Notes

Installation is performed by tradespeople, carpenters, ironworkers, and maintenance mechanics using standard hand or power tools. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat and bind against the material, preventing spin. Apply the appropriate flat washer and nut to the threaded end and tighten to the torque value specified in the applicable structural or equipment design documents. Do not use impact tools at final torque without a verified torque specification, and do not exceed the Grade 2 tensile rating by substituting this fastener in applications requiring Grade 5 or Grade 8 hardware.