Value Collection HCI20310300-050BX Hex Head Bolt 5/16-18

Product Description

The VALUE COLLECTION HCI20310300-050BX is a Grade 2 steel hex head bolt with a 5/16-18 UNC thread and a 3-inch length under head. It is partially threaded and carries an uncoated, bright finish. Built to ASTM A307 standards, this fastener is suited for general-purpose structural and mechanical assemblies where a fully threaded shank is not required. The partial thread design allows the unthreaded shank to bear shear loads across joint interfaces, making it a common choice in light structural connections, equipment mounting, and fabrication work. Licensed tradespeople and fabricators install these in a wide range of commercial and industrial applications.

This bolt is used in general mechanical, structural, and maintenance applications across construction, HVAC equipment mounting, electrical panel installation, and light industrial fabrication. The 5/16-18 UNC thread is one of the most common inch-standard thread sizes, making this fastener compatible with standard hex nuts, lock nuts, and flanged fasteners of the same thread specification. It is sold in a minimum order quantity of 50 per box, making it practical for job-site stocking and contractor supply.

Key Features

• 5/16-18 UNC thread meets standard inch-system fastener specifications
• 3-inch length under head accommodates typical multi-layer clamping stacks
• Partially threaded shank provides shear resistance across joint interfaces
• Grade 2 steel construction suitable for general-purpose, non-critical connections
• Bright uncoated finish — suitable for dry or protected indoor environments
• Conforms to ASTM A307 fastener standard

Compatibility

Designed for use with standard 5/16-18 UNC hex nuts, flat washers, and lock nuts in general-purpose mechanical and structural assemblies.

Installation Notes

Install using a standard hex wrench or socket driver sized for the bolt head. Ensure mating threads are clean and free of debris before assembly. Power down and de-energize any equipment before installing fasteners in electrical or mechanical enclosures. Follow applicable building codes and torque guidelines specified by the equipment manufacturer or structural engineer of record.