Value Collection HNI8187-005BX Hex Nut 1-7/8-5 Grade 8

Product Description

The VALUE COLLECTION HNI8187-005BX is a heavy-duty hex nut threaded to 1-7/8-5 UN specification in Grade 8 steel with a bright, uncoated finish. Grade 8 steel is among the highest-strength classifications for inch-series fasteners, making this nut suited for high-load structural and mechanical assemblies where fastener integrity is critical. The right-hand thread conforms to standard UN thread form, and the large 2-13/16-inch across-flats dimension allows engagement with correspondingly large wrench or socket tooling. At 1.78 pounds, this is a substantial fastener intended for heavy industrial or structural applications.

This hex nut is used in heavy equipment, structural steel connections, industrial machinery, and large-diameter bolted assemblies where a 1-7/8-5 inch-series thread is specified. Typical installers include millwrights, structural ironworkers, heavy equipment mechanics, and maintenance technicians working on presses, frames, shafts, or support structures. The uncoated finish is appropriate for assemblies that will be painted, treated, or used in dry indoor environments where additional corrosion protection is applied separately.

Key Features

• Grade 8 steel construction for high-tensile, high-load fastener applications
• 1-7/8-5 UN right-hand thread for compatibility with standard inch-series bolts of the same designation
• 2-13/16-inch (2.8125 inches) across-flats dimension for use with large hex wrench or impact socket
• Bright, uncoated finish suitable for dry service or secondary coating
• 1-39/64-inch height provides full thread engagement depth for maximum load distribution

Compatibility

Designed for use with 1-7/8-5 UN inch-series threaded bolts or studs in Grade 8 or equivalent high-strength fastener assemblies.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or structural technician familiar with high-strength fastener torque requirements for the given application. Power down and de-energize or de-load the assembly before removing or replacing load-bearing fasteners. Use a properly sized heavy-duty wrench or impact socket matched to the 2-13/16-inch across-flats dimension. Follow the applicable engineering specification or fastener torque table for the joint design — do not estimate torque on Grade 8 hardware in structural or safety-critical connections.