Gibraltar 74213950 Heavy Hex Nut 1-8 Unc Steel

Product Description

The GIBRALTAR 74213950 is a heavy hex nut threaded to the 1-8 UNC standard with a right-hand thread direction. Manufactured from steel with a black oxide finish, this nut delivers the increased bearing surface and wall thickness characteristic of heavy hex fasteners. At 1-1/2 inches across the flats and 55/64 inches in height, it provides a larger wrench surface than standard hex nuts, making it well suited for high-load structural and mechanical connections. Licensed tradespeople and maintenance professionals reach for heavy hex nuts in applications where fastener loosening under vibration or dynamic load is a concern.

This nut is used in structural steel assembly, heavy equipment maintenance, industrial machinery, and general mechanical fabrication where UNC-threaded fasteners are specified. The black oxide finish offers mild corrosion resistance in indoor and sheltered environments. It installs with standard open-end, box-end, or socket wrenches sized for a 1-1/2-inch across-flats profile. Suitable for residential and commercial construction applications as well as maintenance and repair work on industrial equipment.

Key Features

• 1-8 UNC thread form for compatibility with standard unified coarse-thread fastener systems
• Heavy hex profile at 1-1/2 inches across the flats provides increased bearing surface over standard hex nuts
• 55/64 inches in height for added thread engagement depth
• Steel construction for strength in structural and mechanical applications
• Black oxide finish for mild corrosion resistance in sheltered environments
• Right-hand thread direction per standard convention

Compatibility

Designed for use with 1-inch diameter UNC-threaded bolts and studs in heavy hex fastener applications. No specific model or system compatibility was stated in the product data.

Installation Notes

Installation is performed by mechanical, structural, or maintenance tradespeople using a wrench or socket matched to the 1-1/2-inch across-flats dimension. Torque fasteners to the value specified by the engineering or structural drawings for the application — do not assume a torque value. Ensure the mating bolt or stud is free of debris and the threads are clean before assembly. Consult applicable code requirements, such as AISC or relevant structural standards, when used in load-bearing connections.