ASTM A194 Grade 2H Heavy Hex Nuts

ASTM A194 Grade 2H Nuts are high-strength, quenched and tempered carbon steel nuts specifically manufactured for use in high-pressure and high-temperature service, most commonly paired with ASTM A193 Grade B7 Stud Bolts.3 The nuts are typically manufactured to the Heavy Hex dimensional series (ASME B18.2.2), which provides a larger wrenching surface and greater load-bearing area compared to standard hex nuts, ensuring reliable performance when torquing the high-strength B7 stud. Grade 2H nuts are medium carbon steel that has been quenched and tempered at a minimum temperature of 4$850^{\circ}\text{F}$ (5$455^{\circ}\text{C}$) to achieve a minimum proof load stress of 175 ksi and a hardness range that balances strength with ductility.6 This heat treatment is critical as it allows the nut to withstand the high stress imposed by the B7 bolt during tightening and subsequent operation. Zeron Fasteners supplies ASTM A194 Grade 2H Heavy Hex Nuts in various finishes, including Plain, Zinc Plated, Hot Dip Galvanized (HDG), and PTFE (Teflon/Xylan) coated, suitable for critical applications in the Oil & Gas, Power Generation, and Chemical Processing industries.

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