Value Collection D39204 Hex Cap Screw 7/8-9 X 5-1/2 Grade 8

Product Description

The VALUE COLLECTION D39204 is a Grade 8 steel hex head cap screw with a 7/8-9 UNC thread and a 5-1/2-inch length under head. It is partially threaded and finished with a zinc yellow dichromate coating that provides corrosion resistance in demanding environments. Manufactured to ASME B18.2.1 and SAE J429 standards, this fastener meets the mechanical requirements for high-strength structural and mechanical assemblies. It is suited for heavy-duty bolted connections where a high-tensile, inch-series fastener is required.

This cap screw is used in industrial, mechanical, and structural applications where Grade 8 strength is specified. Typical installations include equipment frames, machine bases, heavy steel fabrications, and other assemblies that call for a high-strength UNC fastener. The partial threading allows the unthreaded shank to bear shear loads in close-tolerance bolted joints. Maintenance technicians, millwrights, and fabricators working in manufacturing, construction, and industrial plant environments commonly install this fastener.

Key Features

• Grade 8 steel construction meets SAE J429 mechanical property requirements for high-strength fasteners
• 7/8-9 UNC thread form for compatibility with standard inch-series nuts and tapped holes
• Partially threaded shank provides a bearing surface for shear-load applications
• Zinc yellow dichromate finish adds corrosion protection over bare steel
• Conforms to ASME B18.2.1 dimensional standards for hex head cap screws

Compatibility

Designed as a standard inch-series hex head cap screw for use with 7/8-9 UNC nuts and tapped holes in high-strength structural and mechanical assemblies.

Installation Notes

Installation is typically performed by millwrights, ironworkers, or maintenance mechanics using a standard hex wrench or impact tool sized for the 7/8-inch hex head. Consult the joint design specification for the correct torque value, as Grade 8 fasteners require specific preload to achieve rated clamping force. Inspect threads and mating surfaces for damage before installation. Always use a properly rated nut or tapped hole rated for Grade 8 service.