Value Collection 39660 Hex Lock Nut 1-8 Grade 8 Nylon Insert

Product Description

The VALUE COLLECTION 39660 is a 1-8 UNC hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert creates interference against the mating thread, resisting loosening caused by vibration and torque cycling without damaging the fastener it secures. At 1-3/64 inches in height and 1-7/16 inches across the flats, this is a heavy-duty fastener suited for structural and mechanical assemblies where joint integrity under load is critical. Machinists, millwrights, equipment technicians, and general contractors install this type of hardware in fabrication, maintenance, and repair applications across industrial and commercial settings.

This hex lock nut is designed for inch-system threaded assemblies using 1-8 UNC (Unified National Coarse) threads. The right-hand thread direction follows standard fastener convention and is compatible with standard Grade 8 hardware bolt configurations. Typical applications include heavy equipment frames, structural steel connections, vibration-prone machinery mounts, and utility infrastructure assemblies where a prevailing-torque locking nut is required in place of a standard hex nut.

Key Features

• Nylon insert locking style provides prevailing-torque resistance without damaging mating threads
• Grade 8 steel construction delivers high tensile and proof load strength for demanding structural applications
• Zinc yellow dichromate finish provides corrosion resistance and is visually distinguishable from standard zinc-plated hardware
• 1-8 UNC right-hand thread direction follows standard inch-system fastener convention
• 1-7/16 inches across the flats fits standard SAE and inch-drive sockets and wrenches

Compatibility

Designed as an OEM-style replacement or direct-use hex lock nut for 1-8 UNC threaded bolts and studs in inch-system mechanical and structural assemblies.

Installation Notes

Installation and removal should be performed by a qualified mechanic, millwright, or tradesperson familiar with structural fastener practices. Always de-energize, depressurize, or de-load the assembly before replacing fasteners in service. Use a properly rated inch-drive socket or wrench sized to 1-7/16 inches across the flats. Nylon insert lock nuts are generally rated for single use only and should not be reused once the nylon insert has been compressed, as the locking torque may be significantly reduced on subsequent applications.