Gibraltar 74213919 Hex Nut 1/2-13 Unc Grade 2 Black Oxide

Product Description

The GIBRALTAR 74213919 is a 1/2-13 UNC hex nut manufactured from Grade 2 steel with a black oxide finish. It is a standard fastener used to secure threaded assemblies across a wide range of mechanical, structural, and equipment installation applications. The right-hand thread pattern conforms to Unified National Coarse (UNC) standards. At 3/4 inches across the flats and 7/16 inches in height, this nut is sized for use with a standard 3/4-inch wrench or socket. Licensed tradespeople and maintenance technicians working on HVAC equipment, electrical enclosures, plumbing supports, and general mechanical assemblies will find this a common utility fastener.

This hex nut is suited for light-duty to medium-duty fastening applications in both residential and commercial settings. It is commonly used when assembling equipment frames, mounting brackets, pipe hangers, conduit supports, and access panel hardware. The black oxide finish provides a mild level of corrosion resistance appropriate for dry and semi-protected indoor environments. It is not recommended for outdoor or high-moisture applications where a zinc-plated or stainless steel fastener would be more appropriate.

Key Features

• 1/2-13 UNC thread size with right-hand thread direction
• Grade 2 steel construction for general-purpose fastening
• Black oxide finish for mild corrosion resistance in dry environments
• 3/4 inches across flats for use with standard 3/4-inch wrench or socket
• 7/16 inches in height — standard hex nut profile
• Conforms to Unified National Coarse thread standard; does not meet military specifications

Compatibility

Designed as a general-purpose replacement or supplemental hex nut for any assembly requiring a 1/2-13 UNC right-hand thread fastener in Grade 2 steel.

Installation Notes

This fastener is installed by hand-threading onto a compatible 1/2-13 UNC male threaded fastener and tightened with a 3/4-inch wrench or socket. De-energize and isolate any equipment before performing fastener work on electrical or mechanical assemblies. Do not exceed the torque limitations appropriate for Grade 2 steel fasteners as defined by the applicable equipment manufacturer or relevant codes. Avoid use in high-moisture or corrosive environments where a higher-grade or coated fastener is specified.