Value Collection 1-THN-31F Hex Lock Nut 5/16-24 Ss

Product Description

The VALUE COLLECTION 1-THN-31F is a nylon insert hex lock nut designed to resist loosening under vibration and dynamic loads. Manufactured from 18-8 stainless steel with a bright uncoated finish, this fastener provides reliable corrosion resistance in wet or chemically exposed environments. The nylon insert creates interference with the mating thread to maintain clamp load without adhesives or lock washers. The nut measures 0.25 inches in height with a 0.5-inch width across flats and is threaded to a 5/16-24 UNF right-hand specification. It is sized and graded for use by maintenance technicians, plumbers, electricians, and mechanical contractors across a broad range of assembly and repair applications.

This lock nut suits residential and commercial installations where fastener security under vibration or thermal cycling is required. Common applications include mechanical equipment mounting, HVAC component assembly, plumbing fixture attachment, electrical enclosure hardware, and general trade service work. The 5/16-24 UNF thread pitch is a fine-thread standard found across a wide range of equipment and structural assemblies. The stainless steel construction makes it appropriate for outdoor, humid, or mildly corrosive service environments where carbon steel fasteners would corrode prematurely.

Key Features

• Nylon insert locking style resists loosening from vibration without adhesives
• 18-8 stainless steel construction for corrosion resistance in wet and outdoor environments
• 5/16-24 UNF fine-thread specification for precise thread engagement
• Bright uncoated finish maintains dimensional accuracy and avoids coating buildup on threads
• Right-hand thread direction compatible with standard tooling
• Width across flats of 0.5 inches fits standard 1/2-inch wrenches and sockets

Compatibility

Designed for use with 5/16-24 UNF male-threaded fasteners and hardware meeting inch-system measurement standards. Suitable as an OEM-style replacement or new-installation fastener wherever a nylon insert hex lock nut of this thread size and material grade is specified.

Installation Notes

Installation is performed by hand-threading onto a compatible 5/16-24 UNF bolt or stud, then torquing with a standard 1/2-inch open-end or box wrench. Because the nylon insert adds resistance, do not use impact tools at high speed, as this can damage the insert and reduce locking effectiveness. The nylon insert is rated for single use only — reusing a nylon insert lock nut after full removal is not recommended, as the insert loses its interference fit. Ensure mating fasteners are free of thread damage or debris before installation.