Your bolting system is only as strong as its nuts. That is why engineers in oil and gas, petrochemical, refining, and power generation choose ASTM A194 Grade 2H heavy hex nuts for high-pressure and high-temperature flange connections.
Grade 2H heavy hex nuts are designed to work with B7 and B16 stud bolts, giving critical joints the strength, hardness, and dimensional reliability they need. Whether you are building new pipework, replacing existing fasteners, or stocking spares for plant maintenance, the right nut protects the whole assembly.
Why buyers specify 2H heavy hex nuts:
ASTM A194 Grade 2H, engineered for high-pressure and high-temperature bolting
Heavy hex design provides a larger bearing surface for flange and pressure vessel joints
Hardness and tensile strength matched to B7 stud bolt applications
Full material traceability with mill test certificates and heat numbers
Available in plain, zinc-plated, and hot-dip galvanized finishes
Bulk supply with stable lead times and international packaging
Typical applications:
Pipe flanges and valve connections
Pressure vessels and heat exchangers
Chemical and petrochemical processing lines
Oil and gas wellheads and pipelines
Refinery and power plant maintenance
Structural and heavy industrial fastening
Stock range:
Size: 1/2" to 4"
Thread: UNC and UNRC, metric available on request
Standard: ASTM A194 Grade 2H
Finish: plain, zinc, hot-dip galvanized
Matching stud bolts: ASTM A193 B7 and B16
What to include in your inquiry:
Nut size and thread specification
Quantity and target delivery date
Required coating or surface treatment
Needed certificates, such as MTC, batch inspection, or third-party testing
Destination port if you need freight advice
Contact us today with your specification and quantity. We will confirm availability, pricing, and delivery quickly.
