Value Collection 121230 Heavy Hex Nut 5/16-18 316 Ss

Product Description

The VALUE COLLECTION 121230 is a heavy hex nut with a 5/16-18 UNC thread profile, manufactured from Grade 316 stainless steel with a bright, uncoated finish. This nut is designed for applications where corrosion resistance is critical, including marine environments, chemical processing, and outdoor structural assemblies. The heavy hex pattern provides greater bearing surface than a standard hex nut, improving load distribution on bolted connections. At 0.5625 inches across the flats and a height of 0.2960 inches, it mates with standard 5/16-18 UNC fasteners using a 9/16-inch wrench. Installers across plumbing, HVAC, and industrial maintenance rely on this fastener type for secure, long-lasting connections in corrosive service conditions.

This heavy hex nut is suited for use in residential and commercial mechanical systems, outdoor equipment mounting, pool and water treatment installations, and marine hardware assemblies. The right-hand thread direction is standard for the vast majority of bolted connections. Grade 316 stainless steel provides superior resistance to chlorides and salt exposure compared to Grade 304, making this nut appropriate for wet or chemically aggressive environments where standard carbon steel or zinc-plated fasteners would corrode prematurely.

Key Features

• Grade 316 stainless steel construction for high corrosion resistance in chloride and marine environments
• Heavy hex pattern with 9/16-inch width across flats for increased bearing surface and improved load distribution
• 5/16-18 UNC right-hand thread standard for compatibility with common inch-series bolts and threaded rod
• Bright uncoated finish — no coating to flake, chip, or contaminate the joint
• Height of 0.2960 inches meets heavy hex dimensional standards for structural and mechanical fastening

Compatibility

Designed for use with standard 5/16-18 UNC inch-series bolts, cap screws, and threaded rod in heavy hex fastener applications.

Installation Notes

Installation requires a standard 9/16-inch wrench or socket. Apply appropriate anti-seize compound when mating stainless steel fasteners to prevent galling during tightening, as stainless-to-stainless contact under torque can cause thread seizure. Follow applicable mechanical or structural codes for the installation environment. Always inspect thread condition on the mating fastener before assembly.