When securing critical components in high-pressure or high-temperature environments, not just any fastener will do. 2H nuts are a go-to solution for industrial professionals who need durability, strength, and reliability under extreme conditions. Manufactured to meet the ASTM A194 Grade 2H specification, these heavy hex nuts are built to perform where standard hardware would fail.

What Are 2H Nuts?

2H nuts are heavy hex nuts made from medium carbon steel that undergoes heat treatment to enhance strength and hardness. Compared to standard hex nuts, they are thicker, wider, and heavier, providing a larger bearing surface and superior load distribution. These attributes make them essential for use in harsh operating conditions where structural integrity is non-negotiable.

Applications of 2H Nuts

1. High-Pressure and High-Temperature Systems

2H nuts are widely used in bolted flange connections across a range of pressure-retaining systems, such as:

• Oil & Gas Refineries

• Power Plants

• Petrochemical Processing Facilities

• Steam Distribution Networks

Their heat-treated construction allows them to maintain secure connections even when exposed to high thermal cycles and mechanical loads.

2. Structural and Heavy-Duty Construction

In sectors where equipment and structures must support significant weight and dynamic forces, 2H nuts offer the strength required. They are commonly found in:

• Steel building frameworks

• Bridge construction

• Heavy mining and excavation equipment

Their robust design ensures long-term performance and safety in critical load-bearing assemblies.

3. Elevated Temperature Applications

Thanks to their heat treatment, 2H nuts are capable of withstanding high-temperature environments, making them ideal for use in:

• Boilers

• Heat Exchangers

• Engine and Turbine Assemblies

These nuts help maintain bolt tension over time, reducing the risk of joint loosening due to thermal expansion or vibration.

Installation and Compatibility

• Torque Specifications: Due to their strength and size, 2H nuts require precise torque values during installation to ensure proper clamping force.

• Corrosion Resistance: Often available with protective coatings like zinc, Xylan®, or PTFE to enhance durability in corrosive environments.

• Bolt Pairing: Commonly paired with ASTM A193 Grade B7 bolts or studs for consistency in strength and thermal performance.

Conclusion

Whether you're assembling a pressure vessel in a refinery or constructing a steel bridge, 2H nuts provide the performance and dependability you need. Designed to thrive in the toughest environments, these heavy-duty fasteners are essential components in a wide array of industrial applications. For engineers, fabricators, and maintenance professionals, choosing 2H nuts means investing in the longevity and safety of your operation.