Value Collection D39209 Hex Cap Screw 7/8-9 X 8 in Grade 8

Product Description

The VALUE COLLECTION D39209 is a partially threaded hex head cap screw designed for heavy-duty fastening applications where high tensile strength and corrosion resistance are required. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener meets the dimensional and mechanical requirements of ASME B18.2.1 and SAE J429. The 7/8-9 UNC thread and 8-inch length under head make it well suited for large structural assemblies, heavy equipment, and industrial machinery. Installation is performed by machinists, millwrights, maintenance technicians, and other trades working with structural steel connections.

This cap screw is used in applications requiring a high-strength UNC fastener in inch-series sizing. The partial threading allows the unthreaded shank to bear shear loads, making it appropriate for bolted joints where shank fit in a clearance hole is part of the design. Typical applications include agricultural equipment, construction machinery, industrial frames, and heavy fabrication work where Grade 8 strength class is specified by the engineer or OEM.

Key Features

• Grade 8 steel construction meets SAE J429 mechanical property requirements for high-strength fasteners
• Zinc yellow dichromate finish provides corrosion resistance in industrial environments
• Partially threaded shank allows the bolt body to carry shear loads in fitted clearance holes
• 7/8-9 UNC thread form is the standard coarse-thread series for this diameter in inch fasteners
• Conforms to ASME B18.2.1 for hex head cap screw dimensions and tolerances
• Inch-system sizing for compatibility with standard SAE tooling and hardware

Compatibility

Designed as an OEM-style replacement or service fastener for any application specifying a 7/8-9 UNC x 8-inch partially threaded Grade 8 hex head cap screw per ASME B18.2.1 and SAE J429.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or maintenance technician familiar with structural bolting practices. Verify the mating thread and hole size before installation. Torque to the value specified by the equipment manufacturer or applicable engineering standard for Grade 8 fasteners at this diameter. Always inspect threads for damage before reuse and replace any fastener showing corrosion, galling, or deformation.