Value Collection HNFI250-001BX Hex Nut 2-1/2-12

Product Description

The VALUE COLLECTION HNFI250-001BX is a heavy-duty hex nut designed for use with 2-1/2-12 UN threaded fasteners. Made from Grade 2, Grade A steel with a bright uncoated finish, this nut delivers reliable clamping force in structural, mechanical, and industrial assembly applications. It features a right-hand thread direction and measures 3.75 inches across flats, with a height of approximately 2-9/64 inches. Plumbers, pipefitters, millwrights, and general industrial tradespeople will encounter this size in large-diameter bolted connections across a wide range of equipment and infrastructure work.

This hex nut is suited for large-fastener bolted assemblies commonly found in industrial machinery, structural steel work, heavy equipment maintenance, and piping system flanges. Its UN thread standard makes it compatible with standard unified national thread-form fasteners in the 2-1/2-12 thread series. The uncoated finish is appropriate for applications where a secondary coating or finish will be applied in the field, or where bare steel contact is acceptable per the assembly specification.

Key Features

• 2-1/2-12 UN thread size for large-diameter bolted connections
• Grade 2, Grade A steel construction for dependable mechanical strength
• Right-hand thread direction — standard installation direction
• 3.75 inches across flats for use with standard large hex wrenches or impact sockets
• Bright uncoated finish — suitable for secondary coating or bare steel applications
• Does not meet military specifications — intended for commercial and industrial use

Compatibility

Designed for use with 2-1/2-12 UN threaded bolts and studs in commercial and industrial bolted assemblies requiring Grade 2, Grade A steel hex nuts.

Installation Notes

Installation of large hex nuts in this size range is typically performed by millwrights, pipefitters, or ironworkers using heavy-duty torque wrenches or pneumatic impact tools with appropriate sockets. Always de-energize and lock out equipment before servicing bolted connections on machinery. Follow applicable torque specifications from the equipment manufacturer or relevant code for the assembly. Inspect threads on both the nut and mating fastener for damage or contamination before installation.