Value Collection 32161 Carriage Bolt 5/16-18 2 in Square Neck

Product Description

The VALUE COLLECTION 32161 is a 5/16-18 carriage bolt with a 2-inch length under head, designed for fastening applications that require a smooth, rounded head and a square neck to resist rotation during installation. The bolt is manufactured from Grade 5 steel with a zinc-plated finish for corrosion resistance. The square neck seats into the material being fastened, locking the bolt in place so a nut can be tightened from the opposite side without requiring a wrench or socket on the bolt head. This fastener is commonly installed by tradespeople in structural, mechanical, and equipment assembly work.

This carriage bolt is suited for use in general construction, HVAC equipment mounting, electrical enclosure assembly, plumbing support structures, and similar trade applications where a flush or low-profile bolt head is required. The 5/16-18 UNC thread size is a standard coarse thread, compatible with 5/16-18 nuts and tapped holes in steel, wood, and composite materials. Minimum order quantity is 100 pieces, sold as a single package of 1.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard hardware
• 2-inch length under head for medium-depth fastening applications
• Square neck prevents bolt rotation during nut tightening without a backup tool
• Grade 5 steel construction for high tensile strength in structural use
• Zinc-plated finish provides baseline corrosion protection in interior and sheltered environments

Compatibility

Designed as an OEM-style replacement or standard hardware fastener for use with 5/16-18 UNC nuts and threaded hardware in residential and commercial trade installations.

Installation Notes

Carriage bolts are installed by inserting the bolt through a pre-drilled hole and seating the square neck into the material to prevent spinning. A standard wrench or socket is used only on the nut side. Ensure the hole diameter matches the bolt shank to allow the square neck to engage properly. Power down or de-energize any adjacent equipment before working in electrical or HVAC panel areas where this fastener may be used.