Gibraltar 74213208 Round Knurled Check Nut 3/8-16 Unc

Product Description

The GIBRALTAR 74213208 is a round knurled high torque check nut designed for secure fastening in applications where vibration resistance and a positive grip are critical. Machined from steel with a black oxide finish, this check nut features a 3/8-16 UNC thread and a knurled head profile that allows for firm hand-tightening or tool-assisted installation without slipping. The black oxide coating provides modest corrosion resistance and a clean, low-reflectance appearance. Weighing 0.05 pounds, this nut is a compact, purpose-built fastener suited for mechanical assemblies, HVAC equipment panels, electrical enclosures, and industrial machinery where standard hex nuts are not practical.

This check nut is commonly used in trade and light industrial settings where a low-profile locking fastener with manual adjustability is needed. Its round knurled head makes it well-suited for panel mounting, shaft retention, and control component securing in HVAC units, electrical cabinets, and mechanical assemblies. The 3/8-16 UNC thread is a widely standardized coarse-thread specification, making this nut compatible with a broad range of threaded rods, bolts, and studs found in residential and commercial mechanical systems. Licensed trades and maintenance technicians are the primary installers.

Key Features

• 3/8-16 UNC coarse thread for broad fastener compatibility
• Round knurled head enables high-torque hand tightening without tools
• Steel construction for reliable mechanical strength
• Black oxide finish for corrosion resistance and reduced reflectance
• Compact profile: 3/8 inches overall height, 1 inch head diameter, 3/4 inch base diameter

Compatibility

Designed as a standard replacement or new-installation check nut for 3/8-16 UNC threaded fastener applications in HVAC, electrical, plumbing, and general mechanical assemblies.

Installation Notes

Installation is performed by qualified trades or maintenance technicians as part of mechanical assembly or equipment service. Power down or de-energize any equipment before installing fasteners on live panels or energized enclosures. Use appropriate hand tools and ensure the mating thread is clean and free of debris before threading on the nut. Follow applicable NEC or equipment manufacturer guidelines when installing fasteners within electrical enclosures.