Value Collection R63640246 Carriage Bolt 5/16-18 3in Ss

Product Description

The VALUE COLLECTION R63640246 is a 5/16-18 UNC carriage bolt with a 3-inch length under head, manufactured from Grade 18-8 stainless steel with an uncoated finish. The square neck beneath the domed head locks into wood or soft material to prevent rotation during installation, eliminating the need for a wrench on the bolt side. Grade 18-8 stainless steel provides solid corrosion resistance for both indoor and outdoor applications. This bolt suits trade professionals in plumbing, electrical, HVAC, and general mechanical work where a clean, smooth head profile and rust resistance are required.

Commonly used in fastening applications involving wood framing, equipment mounting, handrail assembly, and bracket attachment, this carriage bolt is appropriate for both residential and light commercial projects. The 5/16-18 UNC thread pattern is a standard inch-series coarse thread, compatible with widely available hex nuts and flat washers. The 3-inch length under head accommodates typical material stack-ups encountered in general trade construction and equipment installation work.

Key Features

• 5/16-18 UNC coarse thread for broad nut and hardware compatibility
• 3-inch length under head suits standard framing and bracket applications
• Square neck prevents bolt rotation during tightening without a second tool
• Grade 18-8 stainless steel construction resists corrosion in wet or outdoor environments
• Uncoated finish maintains dimensional accuracy and allows direct contact with stainless hardware
• Inch measurement system for use with standard UNC tooling and hardware

Compatibility

Designed as a standard inch-series UNC carriage bolt suitable for use with 5/16-18 hex nuts, washers, and threaded inserts in wood, composite, and soft metal substrates.

Installation Notes

Installation is typically performed by carpenters, electricians, plumbers, or HVAC technicians during equipment mounting or structural fastening tasks. Insert the bolt through the pre-drilled hole so the square neck seats fully into the material before applying a nut and washer on the threaded end. Tighten from the nut side only using an appropriately sized wrench or socket. Do not use an impact driver directly on the dome head, as this can damage the neck seating and allow rotation.