Value Collection 39666 Hex Lock Nut 9/16-18 Grade 8

Product Description

The VALUE COLLECTION 39666 is a 9/16-18 UNF hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert creates prevailing torque resistance, preventing the nut from backing off under vibration or dynamic loading without requiring a secondary locking device. At 41/64 inches in height with a 7/8-inch width across flats, this fastener follows standard UNF dimensional conventions. The zinc yellow dichromate coating provides corrosion resistance and is visually distinguishable from uncoated or zinc-clear hardware. Installation is performed with standard hex wrenches or sockets by mechanics, millwrights, and maintenance technicians.

This hex lock nut is used in mechanical assemblies, structural connections, and equipment maintenance applications where vibration resistance is required. The right-hand thread direction is standard for the majority of industrial and commercial fastener applications. Grade 8 steel construction makes it appropriate for high-strength bolting requirements in heavy equipment, automotive, and industrial machinery contexts. Sold individually with a minimum order quantity of 25 units per order.

Key Features

• Nylon insert locking style provides prevailing torque resistance without secondary hardware
• Grade 8 steel construction rated for high-strength fastening applications
• 9/16-18 UNF right-hand thread for standard inch-series fastener compatibility
• Zinc yellow dichromate finish provides corrosion resistance and visual identification
• 41/64 inches height and 7/8 inches width across flats match UNF standard dimensions

Compatibility

Designed as a standard UNF inch-series hex lock nut for use with 9/16-18 threaded fasteners in mechanical, industrial, and equipment maintenance applications.

Installation Notes

Install using a standard hex socket or open-end wrench sized to the 7/8-inch across-flats dimension. Nylon insert lock nuts are single-use by design and should not be reused once the nylon locking element has been engaged and removed, as the insert loses prevailing torque effectiveness. Ensure the mating bolt thread is free of damage and debris before installation. Follow applicable torque specifications for Grade 8 fasteners as defined by the governing mechanical or structural code for the application.