Value Collection D39480 Hex Head Cap Screw 3/4-16 X 4 in Grade 8

Product Description

The VALUE COLLECTION D39480 is a Grade 8 steel hex head cap screw sized 3/4-16 x 4 inches, designed for high-strength fastening applications in mechanical assemblies, structural connections, and equipment fabrication. It features a unified fine thread (UNF) at 3/4-16 and a partially threaded shank measured 4 inches under the head. The zinc yellow dichromate finish provides corrosion resistance and serves as a visual identifier for Grade 8 hardware. This fastener meets ASME B18.2.1 dimensional standards and is installed by machinists, millwrights, and maintenance technicians working on heavy-duty equipment and structural assemblies.

Grade 8 hex head cap screws are used in high-load bolted joints where tensile strength is critical. Typical applications include agricultural equipment, automotive drivetrain assemblies, industrial machinery frames, and structural steel connections. The partially threaded shank allows the unthreaded portion to bear shear loads without thread engagement in the grip zone, making this configuration well suited for applications with precise clamp-length requirements. The 3/4-16 UNF thread provides finer pitch and greater thread engagement per inch compared to coarse-thread equivalents.

Key Features

• Grade 8 steel construction for high tensile and proof load capacity
• 3/4-16 UNF thread for fine-pitch engagement and improved torque control
• Partially threaded shank to handle shear loads in the grip zone
• Zinc yellow dichromate finish for corrosion resistance and Grade 8 identification
• Meets ASME B18.2.1 dimensional standards for hex head cap screws
• 4-inch length under head to accommodate thicker joint stacks

Compatibility

Designed as a standard 3/4-16 UNF Grade 8 hex head cap screw per ASME B18.2.1, compatible with any 3/4-16 UNF tapped hole or nut requiring a Grade 8 fastener with a partially threaded, 4-inch-under-head length.

Installation Notes

Installation is performed by mechanics, millwrights, or maintenance technicians using a standard hex socket or open-end wrench sized for a 3/4-inch hex head cap screw. Always verify the mating nut or tapped hole is also rated for Grade 8 loading before torquing. Follow applicable torque specifications from the equipment manufacturer or a recognized fastener standard, and ensure joint surfaces are clean and free of debris before assembly. Do not substitute a lower-grade fastener in a joint designed for Grade 8 hardware.