Gibraltar 41809G Spherical Flange Nut 1-8 Steel Black Oxide

Product Description

The GIBRALTAR 41809G is a 1-8 threaded spherical flange nut manufactured from Grade 12L14 steel with a black oxide finish. The spherical bearing surface allows the nut to seat evenly against angled or uneven mating surfaces, distributing clamp load and reducing stress concentration. At 1.25 inches tall with a 2-inch diameter flange that is 0.25 inches high, this nut is built for heavy fastening applications where a standard hex nut would not provide adequate bearing area. The 1-5/8-inch hex drive accepts standard industrial wrenches. Weighing 1 pound per unit, it is suited for structural, machinery, and fabrication work handled by millwrights, maintenance technicians, and industrial mechanics.

The 41809G is used in industrial machinery, structural steel assemblies, and heavy equipment where bolt connections must maintain clamping force across non-parallel surfaces. The spherical flange geometry is common in pivot mounts, linkage assemblies, and frame connections that experience angular misalignment or vibration loading. The black oxide finish provides mild corrosion resistance for indoor or protected outdoor environments. Grade 12L14 free-machining steel provides consistent thread form and dimensional accuracy for reliable engagement in high-use applications.

Key Features

• Spherical bearing surface accommodates angular misalignment and uneven mating surfaces
• Grade 12L14 steel for consistent thread quality and dimensional accuracy
• Black oxide finish for mild corrosion resistance
• 2-inch flange diameter provides broad load distribution
• 1-5/8-inch hex size accepts standard industrial wrenches
• Meets TCMAI standards

Compatibility

Designed as an OEM-style replacement or direct-fit spherical flange nut for 1-8 threaded rod and bolt applications in industrial machinery, structural, and fabrication assemblies.

Installation Notes

Installation is performed by millwrights, maintenance mechanics, or structural ironworkers using a 1-5/8-inch wrench or socket. Torque fasteners to the specification defined by the equipment manufacturer or structural engineer of record for the application. Inspect the mating surface and threaded fastener for damage or contamination before installation. Black oxide hardware is not rated for prolonged exposure to harsh chemicals or standing moisture without additional protective coating.