Value Collection 99788 Hex Nut 7/8-9 Grade 8 Black Oxide

Product Description

The VALUE COLLECTION 99788 is a 7/8-9 hex nut machined from Grade 8 steel with a black oxide finish. Grade 8 steel provides high tensile strength suited for demanding fastening applications where standard hardware grades fall short. The black oxide coating offers mild corrosion resistance and a uniform dark appearance. This nut follows Unified National Coarse (UNC) thread standards with a right-hand thread direction, measuring 1.3125 inches across the flats and 0.75 inches in height. It is installed by mechanical contractors, maintenance technicians, and fabricators working with heavy equipment, structural assemblies, and industrial machinery.

This hex nut is used wherever 7/8-9 UNC threaded fasteners are required in high-load applications. Typical scenarios include heavy equipment assembly, structural steel connections, agricultural machinery, and industrial fabrication. The Grade 8 rating makes it appropriate for applications with significant clamping force requirements. It is not intended for use in applications requiring military specification hardware compliance, as this part does not meet MIL-SPEC standards.

Key Features

• Grade 8 steel construction for high tensile strength and durability
• Black oxide finish provides mild corrosion resistance and uniform appearance
• 7/8-9 UNC right-hand thread for broad compatibility with standard threaded fasteners
• 1.3125 inches across flats for use with standard 1-5/16 inch wrenches
• 0.75 inches in height providing adequate thread engagement depth

Compatibility

Designed for use with 7/8-9 UNC threaded bolts and studs in standard inch-series fastener applications requiring Grade 8 strength hardware.

Installation Notes

Installation is performed using a standard open-end, box-end, or socket wrench sized for 1-5/16 inches across the flats. Always verify the mating bolt or stud is also rated Grade 8 or higher to maintain the integrity of the fastener assembly. Follow applicable torque specifications for 7/8-9 Grade 8 fasteners as defined by the relevant engineering or maintenance standard for the assembly. Inspect threads for damage before installation and do not force a nut that does not thread on smoothly by hand.