Value Collection CAI503102250-100BX Carriage Bolt 5/16-18

Product Description

The VALUE COLLECTION CAI503102250-100BX is a 5/16-18 UNC carriage bolt with a 2-1/4 inch length under head and a square neck profile. Made from Grade 5 steel with a zinc-plated finish, this fastener is designed for structural and general-purpose assembly applications where a smooth, round head and anti-rotation neck are required. The square neck seats into the material being fastened to prevent spinning during installation without requiring a wrench on the bolt head. This box contains 100 bolts. Tradespeople, contractors, and maintenance professionals working in construction, equipment assembly, or fabrication will find this a dependable, standard-specification fastener.

Carriage bolts of this size and thread pitch are commonly used in wood-to-wood, wood-to-metal, and light structural connections across residential and commercial construction. Typical applications include framing assemblies, equipment mounting, fence construction, and general mechanical fabrication. The zinc coating provides baseline corrosion resistance suitable for interior and protected exterior environments. The 5/16-18 UNC thread is a widely used coarse-thread standard that mates with standard hex nuts, flange nuts, and threaded inserts of the same specification.

Key Features

• 5/16-18 UNC coarse thread for broad nut and insert compatibility
• 2-1/4 inch length under head suits medium-depth fastening applications
• Square neck prevents bolt rotation during tightening without a secondary tool
• Grade 5 steel construction provides reliable tensile and shear strength for general structural use
• Zinc-plated finish offers corrosion resistance for interior and sheltered exterior installations
• Sold in a box of 100 for job-site and shop inventory convenience

Compatibility

Designed as a standard 5/16-18 UNC carriage bolt suitable for use with any standard 5/16-18 hex nut, lock nut, or threaded insert in inch-measurement fastening applications.

Installation Notes

Carriage bolts are typically installed by driving the square neck flush into a pre-drilled hole sized to the bolt shank, then securing with a washer and nut on the opposite side. Use a properly sized wrench or socket on the nut only — do not attempt to drive from the head. For structural connections, refer to applicable building codes and load tables to confirm Grade 5 fastener suitability for the joint design. Zinc-plated fasteners are not recommended for direct contact with pressure-treated lumber containing copper-based preservatives or in fully exposed outdoor environments without additional protection.