2H Nuts
2H Nuts are heavy-duty fastening components engineered for high-pressure and high-temperature bolted joint assemblies. Manufactured according to ASTM A194 Grade 2H specifications, these heavy hex nuts are widely used with alloy steel stud bolts in critical industrial applications where joint integrity and operational reliability are essential.
Procurement engineers, EPC contractors, plant maintenance teams, and project managers specify 2H nuts for demanding services involving pressure-containing equipment, piping networks, valves, and process systems. Their heat-treated carbon steel construction provides the strength necessary to maintain bolt preload under severe operating conditions. From refinery expansions to offshore installations and power generation facilities, ASTM A194 2H nuts are trusted worldwide for applications that require dependable fastening performance and compliance with recognized engineering standards.
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ASTM A194 Grade 2H Heavy Hex Nuts are high‑strength carbon steel fastening components engineered for secure bolted‑joint assemblies in high‑pressure and high‑temperature service. Heat‑treated to achieve the required hardness and mechanical properties, these heavy‑duty nuts provide the strength and reliability needed for critical bolting applications in pressure‑containing equipment, flanged connections, valves, and industrial piping systems. Their robust construction and larger hex dimensions make them a trusted choice across oil and gas, petrochemical, refining, power generation, and heavy industrial facilities where joint integrity is essential.
Grade 2H nuts are specifically paired with high‑strength stud bolts such as ASTM A193 Grade B7, B7M, B16, and low‑temperature grades like ASTM A320 L7 and L7M when project requirements permit. They are selected by procurement engineers, EPC contractors, maintenance teams, and project managers for demanding services involving thermal cycling, vibration, and fluctuating pressure. Known for dependable performance and compliance with recognized engineering standards, ASTM A194 Grade 2H nuts play a critical role in maintaining bolt preload, gasket compression, and long‑term joint reliability in mission‑critical industrial applications.
- Manufactured to ASTM A194 Grade 2H requirements
- Heavy hex design for improved load distribution
- Heat-treated for enhanced mechanical strength
- Compatible with high-strength stud bolts
- Suitable for pressure-containing equipment
- Designed for elevated temperature applications
- Reliable preload retention characteristics
- Available in metric and imperial thread forms
- Supports critical industrial bolting systems
- Offered in multiple finishes and coatings
Surface Finish Options
Material selection depends on operating pressure, process media, temperature, corrosion resistance, and flange material compatibility.
ASTM A194 Grade 2H Carbon Steel
The standard material for industrial Nuts, providing a balanced combination of strength, toughness, and durability for demanding service conditions.
Zinc-Coated Nuts
A practical option for applications requiring additional protection against atmospheric corrosion while maintaining mechanical performance.
PTFE-Coated Nuts
Recommended for environments where resistance to moisture, chemicals, and thread seizure is important.
Hot-Dip Galvanized Nuts
Suitable for outdoor installations and infrastructure projects exposed to weather and environmental contaminants.
Xylan-Coated Nuts
Provide enhanced corrosion resistance and lower installation torque in specialized industrial applications.
Customer-Specified Finishes
Additional coatings and surface treatments can be supplied to meet project specifications and operational requirements.
Other alloy materials can be manufactured to meet specific project specifications and international standards.
Applications
Refinery Flange Assemblies
Used to secure bolted flange connections in processing units handling hydrocarbons and elevated operating temperatures.
Pressure Vessel Closures
Provides reliable fastening for vessel covers, manways, and pressure-retaining components.
Pipeline Infrastructure
Supports secure bolting in transmission and distribution systems operating under varying pressure conditions.
Petrochemical Plants
Ensures secure bolted connections in refrigeration units, gas processing systems, and cold service applications.
Power Generation Systems
Used in boilers, turbines, condensate systems, and auxiliary plant equipment.
Industrial Valve Installations
Provides dependable fastening for valve body connections and pressure boundary components
Offshore Production Facilities
Suitable for demanding marine environments requiring robust fastening performance
Process Plant Equipment
Applied in pumps, heat exchangers, reactors, and engineered assemblies requiring reliable bolted joints.
Frequently asked questions
ASTM A194 2H Nuts are heat-treated heavy hex nuts designed for high-pressure and high-temperature bolting applications.
They are most frequently used with ASTM A193 Grade B7 stud bolts and other compatible high-strength fasteners.
They feature a larger width across flats and greater thickness than standard hex nuts, providing increased strength and load-bearing capability.
Yes. They are widely used in pressure vessels, flanges, valves, and pressure-retaining equipment.
They are typically produced from heat-treated medium carbon steel meeting ASTM A194 Grade 2H requirements.
Yes. Zinc plating, galvanizing, PTFE coatings, Xylan coatings, and custom finishes are available.
