Jergens 19904 Flange Nut 3/8-16 Unc Black Oxide Steel

Product Description

The JERGENS 19904 is a 3/8-16 UNC flange nut manufactured from low carbon steel with a black oxide finish. The integrated flange distributes clamping load over a wider bearing surface, reducing the need for a separate washer in many fastening applications. The nut measures 0.5 inches in height with a 7/8-inch flange diameter and 1/8-inch flange height, and it spans 11/16 inches across the flats for standard wrench engagement. Thread fit class is 2B, conforming to TCMA fastener standards. This type of hardware is commonly installed by maintenance technicians, pipefitters, HVAC mechanics, and general contractors working in light industrial and commercial environments.

The JERGENS 19904 is suited for use in structural assemblies, equipment mounting, and mechanical fastening applications where a secure, load-distributing nut is required. Its black oxide coating provides mild corrosion resistance and a uniform matte appearance, making it appropriate for interior mechanical and enclosure assemblies. The UNC 3/8-16 thread size is one of the most common in inch-standard fastener applications across trade and light industrial settings.

Key Features

• 3/8-16 UNC thread with 2B fit class for consistent engagement and tolerance control
• Integrated flange eliminates the need for a separate flat washer in many installations
• Black oxide finish provides mild corrosion resistance and reduces light reflection
• Low carbon steel construction offers reliable strength for general-purpose fastening
• Conforms to TCMA fastener standard
• Compact profile at 0.5 inches tall with 11/16-inch across-flats for standard wrench use

Compatibility

Designed as a general-purpose inch-standard flange nut compatible with 3/8-16 UNC threaded fasteners and studs in residential, commercial, and light industrial mechanical assemblies.

Installation Notes

Install using a standard 11/16-inch wrench or socket. Power down or de-energize any equipment before accessing fastener locations in electrical or HVAC enclosures. Ensure mating threads are clean and free of debris before engagement to protect the 2B thread fit. Do not use in applications requiring stainless steel or high-strength alloy fasteners where corrosion resistance or tensile requirements exceed the rating of low carbon steel.