Value Collection 99801 Hex Nut 5/8-18 Grade 8 Steel

Product Description

The VALUE COLLECTION 99801 is a 5/8-18 UNF hex nut manufactured from Grade 8 steel with a black oxide finish. Grade 8 steel provides high tensile strength suited for demanding fastening applications where standard hardware-grade nuts would be inadequate. The black oxide finish offers mild corrosion resistance and reduces light reflection. At 15/16 inches across the flats and 35/64 inches in height, this nut meets standard dimensional tolerances for 5/8-18 fine-thread fastener assemblies. It is a right-hand thread design, meaning it tightens clockwise. Maintenance technicians, millwrights, and general tradespeople working with high-strength fastener assemblies will find this nut appropriate for structural and mechanical connections.

This hex nut is used in mechanical assemblies requiring fine-thread engagement with a 5/8-18 UNF bolt or stud. Fine-thread fasteners like these are common in automotive, equipment manufacturing, and industrial maintenance applications where vibration resistance and precise torque control are priorities. The Grade 8 rating makes this nut suitable for high-load connections in both original equipment and field repair scenarios. It is not rated to military specifications.

Key Features

• Grade 8 steel construction for high tensile strength in demanding assemblies
• 5/8-18 UNF right-hand thread for fine-thread fastener compatibility
• Black oxide finish provides mild corrosion resistance and low-glare surface
• 15/16 inches across the flats for use with standard hex wrench and socket tooling
• 35/64 inches in height for standard hex nut profile

Compatibility

Designed as a standard replacement or new-installation hex nut for 5/8-18 UNF threaded bolts and studs in mechanical and industrial assemblies.

Installation Notes

Installation requires a standard 15/16-inch hex socket or open-end wrench. Ensure mating bolt or stud thread specification matches 5/8-18 UNF before assembly. Apply appropriate torque per the fastener assembly specification for the application — do not over-torque, as this can yield the fastener or damage mating threads. Inspect threads on both nut and bolt for damage or contamination before installation.