Value Collection HFNFI20310-050B Serrated Flange Nut 5/16-24

Product Description

The VALUE COLLECTION HFNFI20310-050B is a serrated flange nut in a 5/16-24 unified fine thread size, constructed from Grade 2 steel with a zinc-plated finish for basic corrosion resistance. The integrated serrated flange distributes clamping load across a wider bearing surface and bites into the mating material to resist loosening under vibration — eliminating the need for a separate lock washer in most applications. The flange diameter measures 0.68 inches and the overall nut height measures 0.283 inches. Width across flats ranges from 0.489 to 0.500 inches. Hardness is rated at 78-90 HR15N. This fastener is installed by electricians, HVAC technicians, plumbers, equipment mechanics, and general tradespeople wherever a reliable, vibration-resistant threaded connection is required.

This serrated flange nut is suited for light- to medium-duty fastening applications in residential and commercial mechanical, electrical, and equipment assembly contexts. The 5/16-24 fine thread pitch provides good clamping force and thread engagement in steel, aluminum, and similar substrates. The zinc plating offers a baseline level of protection against oxidation in dry to mildly humid indoor environments. Typical installations include panel mounting, bracket fastening, conduit support, and equipment frame assembly where vibration resistance is a priority.

Key Features

• Serrated flange locks against loosening under vibration without a separate lock washer
• 5/16-24 unified fine thread for tight clamping force and precise thread engagement
• Flange diameter of 0.68 inches spreads load over a wider bearing surface
• Grade 2 steel construction with zinc-plated finish for corrosion resistance in dry or mildly humid environments
• Hardness rated at 78-90 HR15N per standard specification
• Width across flats of 0.489 to 0.500 inches for standard wrench and socket fitment

Compatibility

Designed for use with 5/16-24 unified fine thread fastener systems in inch-measurement applications across mechanical, electrical, and HVAC equipment assembly.

Installation Notes

Installation is performed with a standard wrench or socket matching the 0.489 to 0.500 inch across-flats dimension. Ensure mating threads are clean and free of debris before installation. The serrated flange must seat flush and fully against the workpiece surface to engage the locking serrations properly. Do not install on soft materials such as plastic or thin sheet aluminum where the serrations may damage the substrate or fail to lock effectively.