Value Collection D39032 Hex Head Cap Screw 5/16-18 Grade 8

Product Description

The VALUE COLLECTION D39032 is a partially threaded hex head cap screw designed for high-strength fastening applications in industrial, mechanical, and construction assemblies. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The 5/16-18 UNC thread size and 1-3/4 inch length under head make it a common choice for medium-duty bolted joints where clamping force and fatigue resistance are critical. It conforms to ASME B18.2.1, the standard governing dimensional and mechanical requirements for inch-series hex cap screws.

This screw is suited for use in fabrication shops, maintenance and repair operations, OEM equipment assembly, and general mechanical work where Grade 8 strength is specified. The partial thread shank provides a bearing surface that resists shear loads, making it appropriate for applications involving dynamic loading or close-tolerance bolt holes. Typical users include machinists, millwrights, maintenance technicians, and structural assemblers working with inch-series fasteners in steel-to-steel or steel-to-component joints.

Key Features

• Grade 8 steel construction for high tensile and proof-load strength
• Zinc yellow dichromate finish provides corrosion and oxidation resistance
• Partially threaded shank resists shear forces and suits close-tolerance holes
• 5/16-18 UNC thread form for broad compatibility with standard inch-series nuts and tapped holes
• Conforms to ASME B18.2.1 dimensional and mechanical standards
• 1-3/4 inch length under head suits medium-depth bolted joint configurations

Compatibility

Designed as a standard inch-series hex head cap screw for use with 5/16-18 UNC nuts, washers, and tapped holes in steel, iron, and compatible structural materials per ASME B18.2.1 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a standard hex wrench or socket driver sized for a 5/16-inch hex cap screw. Follow the equipment manufacturer's torque specifications for Grade 8 fasteners at this thread size and verify that mating threads are clean and free of damage before assembly. Never mix Grade 8 fasteners with lower-grade nuts or tapped-hole materials that cannot support the clamping load. Apply torque evenly and inspect the joint after initial load cycling where required by the assembly specification.