Value Collection 489120PS Carriage Bolt 1/2-13 3-1/2 Inch

Product Description

The VALUE COLLECTION 489120PS is a Grade 2 steel carriage bolt with a 1/2-13 UNC thread and a 3-1/2 inch length under head. It features a square neck that locks the bolt in place when drawn into a wood or soft-material substrate, preventing rotation during nut tightening. The zinc plating provides baseline corrosion resistance suited for dry to mildly humid environments. This fastener meets ASTM A307 standards and is sized in the inch measurement system. Tradespeople and contractors use this bolt in structural, framing, and equipment-mounting applications where a flush, dome-head finish is required on the bearing surface.

This carriage bolt is used in wood-to-wood, wood-to-metal, and light structural assemblies across residential and commercial construction. Typical applications include framing connections, dock and fence construction, equipment bases, and utility mounting hardware. The 1/2-13 thread is a common size in general construction fastener work, and the 3-1/2 inch under-head length accommodates standard dimensional lumber and light steel assembly stacks. Installation requires a standard wrench or socket on the nut side only, as the square neck seats itself.

Key Features

• 1/2-13 UNC thread for compatibility with standard hex nuts and hardware
• 3-1/2 inch length under head accommodates typical lumber and bracket stack-ups
• Square neck design locks bolt against rotation during tightening without a tool on the bolt head
• Grade 2 steel construction meets ASTM A307 fastener standards
• Zinc-plated finish provides corrosion resistance in interior and sheltered exterior environments

Compatibility

Designed as a standard 1/2-13 UNC inch-series carriage bolt for use with matching hex nuts, flat washers, and lock washers in wood and light structural assemblies per ASTM A307 applications.

Installation Notes

Installation is typically performed by carpenters, ironworkers, or general construction trades. Drill a clean hole matching the bolt diameter so the square neck seats flush and does not spin. Apply torque to the nut side only using an appropriate wrench or socket — do not drive the domed head. Follow applicable building codes and structural specifications for required torque values and connection design.