Value Collection 3188CGNFG Carriage Bolt 5/16-18 5-1/2 in

Product Description

The VALUE COLLECTION 3188CGNFG is a fully threaded carriage bolt designed for structural fastening applications where a smooth, round head and self-locking square neck are required. Built to ASME B18.5 standards, this bolt features a 5/16-18 UNC thread and measures 5-1/2 inches in length under the head. The square neck seats into the substrate to prevent rotation during tightening, eliminating the need for a wrench on the bolt head. Constructed from Grade 1006-1050 steel with a galvanized zinc-plated finish, it provides corrosion resistance suitable for both indoor and outdoor installations.

This carriage bolt is suited for wood-to-wood, wood-to-metal, and general structural assemblies commonly found in construction, fencing, decking, equipment mounting, and utility framing. The 5/16-18 UNC thread size is a standard inch-series specification widely used across residential and light commercial projects. Tradespeople, contractors, and maintenance crews working on structural connections will find this bolt appropriate for through-bolt applications where a nut and washer are used on the opposing side.

Key Features

• 5/16-18 UNC fully threaded shank for maximum thread engagement along the full bolt length
• 5-1/2 inch length under head accommodates thicker material stacks and spacer assemblies
• Square neck design locks into substrate to resist rotation during nut tightening
• Galvanized zinc-plated finish provides corrosion resistance for indoor and outdoor use
• Grade 1006-1050 steel construction meets ASME B18.5 fastener standards
• Inch system of measurement for compatibility with standard SAE tooling and hardware

Compatibility

Designed as a standard inch-series carriage bolt for use with 5/16-18 UNC nuts and washers in wood, composite, and light structural metal assemblies per ASME B18.5.

Installation Notes

Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and prevent spin. Apply a nut and washer to the threaded end and tighten with a standard wrench or socket. Do not apply a wrench to the round domed head. Follow applicable building codes and structural specifications when using carriage bolts in load-bearing connections.