Value Collection 31128BMGNFG Hex Head Bolt 5/16-18 8 in

Product Description

The VALUE COLLECTION 31128BMGNFG is a 5/16-18 partially threaded hex head bolt designed for general fastening applications where corrosion resistance and dimensional consistency are required. The bolt measures 8 inches in length under the head and is manufactured from Grade 2 steel with a hot-dipped galvanized finish. The 1/2-inch hex drive is compatible with standard wrenches and sockets. Partial threading allows the unthreaded shank to bear shear loads, making this bolt suitable for structural and mechanical connections. It conforms to ANSI/ASME B18.2.1 dimensional standards, ensuring predictable fit and interchangeability in standard bolt-hole patterns.

This bolt is used across a wide range of trade and light structural applications, including HVAC equipment mounting, mechanical support framing, plumbing hangers, electrical unistrut assemblies, and general equipment fastening. The hot-dipped galvanized coating makes it appropriate for outdoor, damp, or corrosive environments where plain or zinc-plated fasteners would have shortened service life. Installers working on rooftop equipment, outdoor condensing units, or utility structures commonly specify galvanized Grade 2 hardware of this type.

Key Features

• 5/16-18 UNC thread form with 8-inch length under head for deep-reach fastening applications
• Hot-dipped galvanized finish provides enhanced corrosion resistance versus electroplated alternatives
• Partially threaded shank handles shear loads in bolted connections
• 1/2-inch hex head fits standard open-end, box, and socket wrenches
• Grade 2 steel construction meets ANSI/ASME B18.2.1 dimensional standards
• Conforms to ANSI/ASME B18.2.2 nut compatibility standards

Compatibility

Designed as a standard 5/16-18 UNC hex head bolt for use with any ANSI/ASME B18.2.2-compliant 5/16-18 hex nut; suitable for standard 11/32-inch or 3/8-inch clearance hole patterns in steel, aluminum, and wood substrates.

Installation Notes

Installation is performed with a 1/2-inch wrench or socket. Always use a flat washer and appropriate nut torqued to values specified by the equipment manufacturer or applicable structural code. Power down or de-energize any equipment before accessing fastener locations on live assemblies. Galvanized fasteners should not be mixed with dissimilar metals in direct contact where galvanic corrosion is a concern.