Value Collection HCI51000375G Hex Head Cap Screw Grade 5

Product Description

The VALUE COLLECTION HCI51000375G is a partially threaded hex head cap screw engineered for heavy-duty fastening applications in structural, mechanical, and industrial assemblies. Sized at 1-8 (1 inch diameter, 8 threads per inch, UNC thread standard) with a 3-3/4 inch length under head, this fastener is manufactured from Grade 5 steel and finished with a hot-dipped galvanized coating for corrosion resistance. The partial threading provides a smooth shank section, which is well suited to applications requiring a grip or pivot point, or where shear strength along the unthreaded shank is a factor. Installers across HVAC, plumbing, electrical, and general construction trades rely on this fastener type for structural connections and equipment mounting.

This hex head cap screw is appropriate for use in residential and commercial construction, mechanical equipment mounting, structural steel connections, and industrial maintenance applications. The UNC thread form is the most common inch-series coarse thread standard, making it compatible with standard inch-series nuts, washers, and tapped holes throughout the trade. The hot-dipped galvanized finish offers meaningful corrosion resistance for outdoor, wet, or moderately corrosive environments, including rooftop HVAC mounting frames, outdoor electrical enclosures, and exposed plumbing supports.

Key Features

• Grade 5 steel construction provides higher tensile and proof load strength compared to Grade 2 fasteners
• Hot-dipped galvanized finish delivers corrosion resistance for outdoor and wet-environment installations
• Partial threading allows for a smooth shank section, improving shear strength and grip in bolted joints
• UNC (Unified National Coarse) thread standard ensures broad compatibility with standard inch-series hardware
• 1-8 thread size and 3-3/4 inch length under head suit heavy structural and mechanical fastening tasks

Compatibility

Designed for use with standard inch-series Grade 5 compatible hex nuts, flat washers, and lock washers in UNC thread form. Suitable as a general-purpose structural hex cap screw in residential and commercial mechanical and construction applications.

Installation Notes

Installation should be performed by qualified tradespeople familiar with fastener torque requirements for Grade 5 UNC hardware. Always use a properly sized hex wrench or socket to avoid rounding the head. Ensure mating nuts and tapped holes are also rated for Grade 5 load requirements. When installing in corrosive or outdoor environments, inspect the galvanized coating for damage before use and apply compatible thread lubricant if required by the application.