Value Collection CAI203101250-050B Carriage Bolt 5/16-18

Product Description

The VALUE COLLECTION CAI203101250-050B is a 5/16-18 carriage bolt with a 1-1/4 inch length under head, manufactured from Grade 2 steel with a zinc-plated finish. The square neck under the domed head locks into a mating square hole or wood substrate, preventing rotation during nut tightening. This fastener meets ASTM A307 standards and uses Unified National Coarse (UNC) thread form. It is a general-purpose bolt suited to light structural connections, wood-to-metal assemblies, and fabrication work where a smooth, rounded head profile is required on the finished face.

Carriage bolts in this size range are commonly installed in residential and light commercial construction, wood framing, deck and fence assemblies, equipment mounting, and general shop fabrication. The 5/16-18 UNC thread is a widely used standard size compatible with 5/16-18 hex nuts and washers. This bolt is sold in a minimum order quantity of 50 pieces, making it appropriate for production assembly, maintenance shop stock, or multi-fastener repair jobs where consistent hardware is needed across multiple connection points.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard nuts and threaded hardware
• 1-1/4 inch length under head suits thin-to-medium material stack applications
• Square neck prevents bolt rotation during installation without requiring a wrench on the head
• Zinc-plated finish provides basic corrosion resistance for indoor and sheltered outdoor use
• Grade 2 steel construction meets ASTM A307 fastener standards
• Sold in 50-piece minimum quantity for job-lot and shop-stock use

Compatibility

Designed as a standard inch-series carriage bolt for use with 5/16-18 UNC hex nuts, flat washers, and lock washers in wood, metal, and composite assemblies requiring a flush or low-profile head.

Installation Notes

Carriage bolts are installed by a general tradesperson, carpenter, or maintenance technician using a standard wrench or socket on the mating nut. Insert the bolt through a pre-drilled hole sized to allow the square neck to seat flush and lock; do not drive the bolt through the material with a hammer in a way that damages the shank threads. Tighten from the nut side only once the square neck is fully seated. Follow applicable structural connection requirements per local building codes when used in load-bearing assemblies.