Value Collection 99781 Hex Nut 5/16-18 Grade 8 Black Oxide

Product Description

The VALUE COLLECTION 99781 is a Grade 8 steel hex nut with a black oxide finish, designed for high-strength fastening applications. Threaded to the 5/16-18 UNC standard with a right-hand thread direction, this nut delivers the clamping force and torque resistance required in demanding mechanical and structural assemblies. The black oxide coating provides a degree of corrosion resistance and reduces light reflection, making it a common choice in industrial, automotive, and equipment manufacturing environments. Installed by machinists, millwrights, and maintenance technicians, this nut meets the dimensional requirements expected of a standard UNC hex nut.

This hex nut is suited for use in general industrial assemblies, equipment fabrication, and maintenance applications where Grade 8 strength is specified. It is appropriate for bolted connections subject to high tensile loads and vibration. The 5/16-18 UNC thread size fits a wide range of standard Grade 8 bolts and threaded rod used in steel fabrication, machinery mounting, and structural fastening tasks. This item is sold individually with a minimum order quantity of 100 pieces.

Key Features

• Grade 8 steel construction for high-strength fastening requirements
• 5/16-18 UNC right-hand thread for compatibility with standard UNC fasteners
• Black oxide finish provides mild corrosion resistance and a low-glare surface
• 0.5 inches width across flats for use with standard 1/2-inch wrenching tools
• 17/64-inch height for compact seating in tight assemblies
• Does not meet military specifications

Compatibility

Designed as a standard UNC hex nut replacement or new-build fastener for 5/16-18 threaded bolts and rod in Grade 8 steel applications.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or maintenance technicians using a standard 1/2-inch wrench or socket. Ensure mating bolt or threaded rod is also Grade 8 and free of debris or damage before threading the nut. Follow applicable torque specifications from the equipment manufacturer or relevant fastener standards for 5/16-18 Grade 8 hardware. Do not mix Grade 8 nuts with lower-grade fasteners in high-load connections.