Value Collection HCI20870450G Hex Head Bolt 7/8-9 Grade 2

Product Description

The VALUE COLLECTION HCI20870450G is a 7/8-9 UNC hex head bolt designed for general structural and mechanical fastening applications. This bolt measures 4-1/2 inches in length under head and is manufactured from Grade 2 steel with a hot-dipped galvanized finish that provides corrosion resistance in exposed or outdoor environments. It is partially threaded, which is standard for bolts of this length and thread size, allowing the unthreaded shank to carry shear loads. The bolt conforms to ASTM A307, a widely recognized standard for low-carbon steel bolts used in general-purpose structural connections. Installation is typically performed by ironworkers, millwrights, plumbers, or general contractors depending on application.

This bolt is suited for residential and commercial construction, equipment mounting, structural steel connections, HVAC equipment bases, pipe support structures, and similar general-purpose fastening tasks. Its hot-dipped galvanized coating makes it appropriate for outdoor, wet, or moderately corrosive environments where an uncoated fastener would be prone to rust. The 7/8-9 UNC thread is a common heavy-fastener size found across structural, mechanical, and trade applications.

Key Features

• 7/8-9 UNC thread for compatibility with standard heavy-duty nuts and tapped holes
• 4-1/2 inches length under head for use in thick-stack or deep-clearance connections
• Hot-dipped galvanized finish for corrosion resistance in outdoor or wet environments
• Partially threaded shank distributes shear loads along the unthreaded body
• Grade 2 steel meets ASTM A307 for general structural fastening requirements
• Inch measurement system for use with standard imperial tooling

Compatibility

Designed as a general-purpose replacement or new-installation fastener compatible with 7/8-9 UNC nuts, washers, and threaded connections in structural and mechanical assemblies conforming to ASTM A307 specifications.

Installation Notes

Install using a standard impact wrench or combination wrench sized for 7/8-9 hex fasteners. Follow applicable torque specifications from the equipment manufacturer or structural engineer of record, as ASTM A307 does not prescribe a single installation torque. Always use a properly rated flat washer and nut to distribute clamping load. Inspect the galvanized coating for damage before installation and apply cold galvanizing compound to any exposed areas if required by project specifications.