Value Collection HCI20870350G-010BX Hex Head Bolt 7/8 9

Product Description

The VALUE COLLECTION HCI20870350G-010BX is a 7/8-9 UNC hex head bolt designed for general structural and mechanical fastening applications. It is manufactured from Grade 2 steel with a hot-dipped galvanized finish, providing corrosion resistance in outdoor and high-moisture environments. The bolt measures 3.5 inches in length under the head and features partial threading, which is standard for bolts of this length and diameter. It conforms to ASTM A307 requirements, making it suitable for low-carbon steel bolted connections in construction, infrastructure, and equipment assembly work. Plumbers, millwrights, ironworkers, and general contractors commonly spec this fastener.

This bolt is used in residential and commercial construction framing, mechanical equipment mounting, pipe flange connections, and structural steel assembly. The partially threaded shank provides a bearing surface in the bolt grip area, which is appropriate when clamping through thick or stacked materials. The hot-dipped galvanized coating suits exterior installations and applications where hardware will be exposed to moisture, soil contact, or corrosive conditions.

Key Features

• 7/8-9 UNC thread size with partial threading for grip-area bearing surface
• 3.5 inches length under head, measured per standard fastener convention
• Grade 2 steel construction meeting ASTM A307 specification
• Hot-dipped galvanized finish for corrosion resistance in wet or outdoor environments
• Inch-system measurement for compatibility with standard UNC tooling and hardware

Compatibility

Designed as a standard 7/8-9 UNC partially threaded hex head bolt for use with compatible Grade 2 or ASTM A307 applications requiring a 3.5-inch fastener with a hot-dipped galvanized finish.

Installation Notes

Installation requires a standard 1-3/8 inch hex wrench or socket appropriate for a 7/8-9 bolt head. Torque requirements depend on joint design, material, and the applicable structural or mechanical code — consult the relevant specification or engineering requirement before final tightening. For structural steel applications, refer to AISC or applicable building code guidelines. Always inspect threads for damage before installation and ensure the nut and mating threads are clean and free of debris.