Value Collection 1-THN-31C Hex Lock Nut 5/16-18 Ss

Product Description

The VALUE COLLECTION 1-THN-31C is a nylon insert hex lock nut in 5/16-18 UNC thread, manufactured from 18-8 stainless steel with a bright uncoated finish. The nylon insert creates prevailing-torque resistance that prevents loosening under vibration and thermal cycling without requiring thread-locking compound. At 0.25 inches tall with a 0.5 inch width across flats, this nut fits standard hex tooling. The 18-8 stainless steel construction provides corrosion resistance suitable for wet, outdoor, and chemical-exposure environments. Installed by HVAC technicians, plumbers, electricians, and mechanical contractors wherever a reusable, vibration-resistant fastener is required in stainless applications.

This nylon insert lock nut is appropriate for general mechanical assemblies, equipment mounting, pipe hanger hardware, electrical panel work, and light structural connections requiring a right-hand UNC thread. The 5/16-18 thread size is common across HVAC equipment brackets, conduit support hardware, plumbing fixtures, and pool equipment enclosures. The bright uncoated finish retains the natural corrosion resistance of the 18-8 alloy and is suited for applications where a secondary coating could contaminate a process or reduce dimensional accuracy in tight-tolerance joints.

Key Features

• Nylon insert locking style provides prevailing-torque resistance against vibration-induced loosening
• 18-8 stainless steel construction for corrosion resistance in wet and outdoor environments
• 5/16-18 UNC right-hand thread for compatibility with standard inch-series fastener systems
• Bright uncoated finish preserves material corrosion resistance without added coating mass
• Width across flats of 0.5 inches accepts standard 1/2 inch hex tooling
• Reusable design allows removal and reinstallation without sacrificing locking performance for a limited number of cycles

Compatibility

Designed for use with 5/16-18 UNC male-threaded fasteners across general mechanical, HVAC, plumbing, electrical, and pool equipment assemblies requiring a stainless steel nylon insert lock nut.

Installation Notes

Installation is performed by hand-starting the nut onto the mating bolt or stud, then driving to final torque with a standard 1/2 inch hex wrench or socket. Consult applicable mechanical or structural specifications for the correct torque value for the assembly. Nylon insert lock nuts are suitable for repeated use but should be inspected for insert integrity before reuse. Do not exceed the temperature limits of the nylon insert, as elevated heat can degrade the locking element over time.