Value Collection 3GBM905C0408 Hex Head Bolt 5/16-18

Product Description

The VALUE COLLECTION 3GBM905C0408 is a Grade 2 steel hex head bolt with a 5/16-18 UNC thread and a length under head of 4.5 inches. It features a hot-dipped galvanized finish for corrosion resistance and is partially threaded, making it suited for applications where the shank must bear load or pass through clearance holes. The 1/2-inch hex drive accepts standard hex wrenches and sockets. This fastener meets ANSI/ASME B18.2.1 and ANSI/ASME B18.2.2 standards, making it appropriate for general-purpose structural and mechanical assembly work in trade and light industrial settings.

This bolt is used in a wide range of residential and light commercial applications including HVAC equipment mounting, electrical panel and conduit supports, plumbing bracket installations, and general mechanical assembly. Its galvanized finish makes it suitable for indoor and moderately corrosive outdoor environments. Tradespeople across HVAC, plumbing, and electrical disciplines commonly use Grade 2 galvanized hex bolts for equipment anchoring, strut channel assembly, and structural connections where high-strength alloy fasteners are not required.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard nuts and tapped components
• 4.5 inches length under head with partial threading for shank load-bearing and clearance-hole applications
• Hot-dipped galvanized finish provides corrosion resistance in exposed or moderately humid environments
• Grade 2 steel construction meets ANSI/ASME B18.2.1 and B18.2.2 standards
• 1/2-inch hex size accepts common wrenches and impact sockets

Compatibility

Designed as a general-purpose hex head bolt for use with standard 5/16-18 UNC hex nuts, lock nuts, and tapped holes in steel, aluminum, and similar substrates common in trade installation work.

Installation Notes

Installation does not require a licensed trade but is commonly performed by HVAC technicians, plumbers, and electricians during equipment mounting and structural support work. Always de-energize electrical equipment and shut off mechanical systems before fastening near live components. Use a properly sized 1/2-inch wrench or socket to avoid rounding the hex. Follow applicable codes such as NEC or IFGC for fastener placement near electrical or gas equipment.