Gibraltar 74213893 Hex Nut 5/16-18 Grade 2 Steel Black Oxide

Product Description

The GIBRALTAR 74213893 is a 5/16-18 UNC hex nut machined from Grade 2 steel with a black oxide finish. It features a right-hand thread and measures 0.5 inches across the flats with a height of approximately 0.266 inches (17/64 inches). The black oxide coating provides moderate corrosion resistance and reduces light reflection, making it suitable for general mechanical and structural fastening applications. This nut weighs approximately 0.001 pounds and is sold individually. It is a standard hardware item installed by HVAC technicians, plumbers, electricians, and general trade professionals wherever a 5/16-18 UNC fastener is required.

This hex nut is used in a wide range of residential and light commercial applications, including equipment mounting, bracket assembly, panel fastening, and general hardware replacement. It is appropriate for use in any application that calls for a standard 5/16-18 UNC nut in steel. The black oxide finish makes it a common choice in applications where a non-reflective, dark fastener is preferred or required. It is not rated to military specifications.

Key Features

• 5/16-18 UNC thread size with right-hand thread direction
• Grade 2 steel construction for standard-duty fastening
• Black oxide finish for moderate corrosion resistance and low reflectivity
• 0.5 inches width across flats for use with standard 1/2-inch wrenches
• 17/64-inch height fits standard UNC nut profile
• Does not meet military specifications — rated for general commercial use

Compatibility

Designed as a standard 5/16-18 UNC hex nut compatible with any 5/16-18 UNC threaded bolt, stud, or rod in general mechanical, structural, or equipment-mounting applications.

Installation Notes

Install using a standard 1/2-inch wrench or socket. Ensure mating bolt or stud threads are clean and free of debris before assembly. Do not exceed the torque rating appropriate for Grade 2 steel fasteners as specified by the equipment manufacturer or applicable mechanical codes. Inspect threads for damage before installation.