Value Collection 309738MSC Heavy Hex Nut 2-3/4-4 Unc

Product Description

The VALUE COLLECTION 309738MSC is a heavy hex nut threaded to 2-3/4 - 4 UNC specification in a right-hand thread direction. Manufactured from steel with an uncoated finish, this nut carries a 2B class of fit, making it appropriate for standard fastening applications that call for a heavy hex profile. At 4-1/4 inches across the flats and 2-45/64 inches in height, it is significantly larger and heavier than a standard hex nut, providing greater bearing surface and load distribution. Weighing 7.38 pounds, it is suited for structural and heavy industrial assemblies where standard hardware is insufficient.

This heavy hex nut is used in structural steel construction, heavy equipment assembly, pipeline flanges, industrial machinery, and other applications requiring large-diameter fasteners with a UNC thread form. The 2B class of fit indicates a standard internal thread tolerance suitable for general industrial use. Installations are typically performed by millwrights, ironworkers, pipefitters, or maintenance mechanics working on large-scale mechanical assemblies.

Key Features

• 2-3/4 - 4 UNC thread specification for large-diameter fastening applications
• Right-hand thread direction — standard installation with clockwise tightening
• Heavy hex profile at 4-1/4 inches across flats provides increased bearing surface
• 2B class of fit for standard industrial thread tolerance
• Uncoated steel construction for use where additional coatings are not required
• 7.38-pound weight reflects the robust cross-section of the heavy hex form

Compatibility

Designed for use with 2-3/4 - 4 UNC threaded fasteners in heavy hex nut applications. Suitable for structural bolting, flange connections, and industrial assemblies using the UNC thread standard.

Installation Notes

Installation of large-diameter heavy hex nuts typically requires calibrated torque wrenches or hydraulic torque tools appropriate for the bolt grade and application. Always de-energize and lockout equipment before performing fastener service on mechanical or electrical assemblies. Structural bolting applications may fall under AISC, RCSC, or applicable local building code requirements — verify the applicable specification before installation. Do not mix thread standards or grades within a fastener assembly.