Value Collection 314700BR Heavy Hex Nut 2-8 A194 2H

Product Description

The VALUE COLLECTION 314700BR is a heavy hex nut threaded to a 2-8 unified coarse specification and manufactured from A194 Grade 2H steel with a bright, uncoated finish. Heavy hex nuts are dimensionally larger across the flats and taller than standard hex nuts, providing greater bearing surface and higher clamp load retention under demanding conditions. This nut carries a right-hand thread with a 2B fit class, making it appropriate for high-strength bolted connections in structural, pressure vessel, and industrial piping applications. It is installed by pipefitters, ironworkers, millwrights, and mechanical contractors who require a fastener that meets ASME B1.1 and ASME B18.2.2 dimensional standards.

This heavy hex nut is suited for large-diameter bolting applications common in petrochemical, refinery, power generation, and heavy industrial construction. The A194 Grade 2H designation indicates a medium-carbon steel nut heat-treated to achieve a hardness range of 95 HRB to 35 HRC, meeting the mechanical requirements typically paired with ASTM A193 B7 studs and bolts. It is frequently used in flanged pipe joints, pressure vessels, heat exchangers, and structural steel connections where torque retention and dimensional conformance are critical.

Key Features

• A194 Grade 2H steel construction with hardness range of 95 HRB to 35 HRC for high-strength bolting service
• Heavy hex geometry at 3.125 inches across flats and 1.969 inches height provides increased bearing surface versus standard hex
• Right-hand, 2B class thread fit per ASME B1.1 ensures dimensional interchangeability with conforming studs and bolts
• Bright, uncoated finish — no coating thickness to account for in precision joint calculations
• Meets ASME B18.2.2 fastener dimensional standard
• UNSPSC Code 31161727 for procurement system compatibility

Compatibility

Designed for use with 2-8 UN externally threaded fasteners — typically large-diameter studs and bolts manufactured to ASTM A193 Grade B7 or equivalent high-strength specifications used in industrial flanged and structural assemblies.

Installation Notes

Installation of large-diameter heavy hex nuts should be performed by qualified tradespeople familiar with torque requirements for the applicable joint standard. Always de-energize, depressurize, and isolate any system before breaking or making bolted connections. Use calibrated torque equipment appropriate for the fastener size and target clamp load; thread lubrication or lack thereof significantly affects required torque values. Follow the applicable piping or structural code — such as ASME B31.3, ASME Section VIII, or AISC specifications — for proper bolt-up sequence and verification.