Value Collection 39652 Hex Lock Nut 5/16-18 Grade 8

Product Description

The VALUE COLLECTION 39652 is a 5/16-18 hex lock nut with a nylon insert locking mechanism, manufactured from Grade 8 steel with a zinc yellow dichromate finish. The nylon insert creates friction against the mating thread to resist loosening from vibration and torque without requiring a secondary locking component. At 23/64 inches high with a 1/2-inch width across flats, this nut suits high-strength fastening applications where a standard hex nut would be insufficient. It follows UNC thread standards with a right-hand thread direction and weighs approximately 0.011 pounds per unit. Installation requires a standard open-end or box wrench sized for a 1/2-inch hex.

This nylon insert lock nut is suited for mechanical assemblies, structural connections, and equipment maintenance tasks where vibration resistance is a priority. Grade 8 steel construction makes it appropriate for high-load environments in industrial, agricultural, and heavy equipment settings. The zinc yellow dichromate finish provides corrosion resistance for moderate-exposure applications. It is commonly installed by millwrights, maintenance technicians, and mechanical contractors working on steel fabrications and equipment frames.

Key Features

• Nylon insert locking style resists loosening under vibration without a separate lock washer
• Grade 8 steel construction for high tensile strength fastening applications
• Zinc yellow dichromate finish provides corrosion resistance in moderate-exposure environments
• UNC 5/16-18 thread size with right-hand thread direction
• 23/64 inches height and 1/2-inch width across flats for standard wrench compatibility

Compatibility

Designed for use with 5/16-18 UNC right-hand threaded fasteners and bolts in Grade 8 or compatible steel assemblies.

Installation Notes

Installation is performed by hand-threading the nut onto the mating bolt until snug, then tightening with an open-end or box wrench sized to 1/2-inch across flats. De-energize or lock out any equipment before performing fastener replacement or tightening in powered machinery per applicable OSHA lockout/tagout procedures. Do not reuse nylon insert lock nuts that have been fully torqued, as the nylon insert loses clamping effectiveness after initial compression.