Value Collection 489122PS Carriage Bolt 1/2-13 4-1/2 in Grade 2

Product Description

The VALUE COLLECTION 489122PS is a Grade 2 steel carriage bolt with a 1/2-13 UNC thread and a 4.5-inch length under the head. It features a square neck that locks into the material being fastened, preventing the bolt from spinning during nut tightening. A zinc plating provides corrosion resistance for general-duty applications. This fastener meets ASTM A307 standards and is suited for structural, woodworking, and general fabrication applications where a smooth, domed head with an anti-rotation neck is required.

Carriage bolts in this size range are commonly used in residential and light commercial construction, including deck building, framing connections, wood-to-wood assemblies, and equipment mounting. The 1/2-13 UNC thread is a standard coarse-pitch size widely compatible with hex nuts, coupling nuts, and threaded inserts of the same specification. Zinc plating makes this bolt appropriate for dry to mildly humid indoor environments and protected exterior assemblies.

Key Features

• 1/2-13 UNC coarse thread for broad compatibility with standard hardware
• 4.5-inch length under head for through-fastening medium to thick materials
• Square neck design locks bolt in place during installation, eliminating the need for a wrench on the bolt head
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish provides basic corrosion resistance in general-duty environments

Compatibility

Designed for use with standard 1/2-13 UNC hex nuts, washers, and threaded hardware in general construction and fabrication assemblies.

Installation Notes

Installation is performed by inserting the bolt through a pre-drilled hole and pulling the square neck into the material surface to prevent rotation. Tighten with a standard wrench or socket on the nut side only. Do not use an impact driver on the bolt head, as this can damage the dome profile and dislodge the square neck seat. Follow applicable structural and building codes when using this fastener in load-bearing connections.