Home > Stud Bolts > Stainless Steel 321 / 321H Stud Bolts
Mitchell Stainless, based in Hamilton, New Zealand, manufactures and supplies high-performance Stainless Steel 321 and 321H stud bolts built for extreme conditions. These stud bolts are engineered to perform where heat, pressure, and stress are constant threats. Known for their stability at elevated temperatures and long-term reliability, SS 321/321H stud bolts deliver strength you can trust in critical assemblies. With precise threading, dimensional accuracy, and strict quality control, Mitchell Stainless ensures fastening solutions that hold firm under pressure, making them a dependable choice for high-temperature and heavy-duty industrial applications.
Stainless Steel 321 and 321H stud bolts are austenitic stainless steels containing chromium, nickel, and titanium. The 321H variant has more carbon content than the 321 variant for greater high-temperature strength. This type of stud bolt is widely used in high-temperature and high-pressure environments in petrochemical, aerospace, and marine industries. Mechanical properties include excellent tensile strength, creep resistance, and good weldability that make them very reliable and durable in extreme conditions.
| Grade | Stainless Steel 321 / 321h |
| Specifications | ASTM A193 / ASME SA193, DIN, ASTM, BS and all International Standards |
| Length | 3mm to 200mm |
| Size | M 02 to M 160, Custom Sizes |
| Types | Threaded Rod, Class A double ended stud, Tie Rod, Double Ended Stud, Stud Bolts, Bronze Hex Studs, Threaded Studs etc |
| Element | Ni | C | Mn | P | S | Si | Cr |
| SS 321 / 321h | 9.00 – 12.00 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 |
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SS 321 / 321h | 8.0 g/cm3 | 1454 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 40 % |
Contact us to get a quick quote for your requirement.
These general-purpose stud bolts are known for excellent corrosion resistance and stability at high temperatures, suitable for diverse industrial applications.
Designed with a hexagonal head for easy installation, these bolts offer high strength and resistance to scaling and oxidation.
These fully threaded bolts provide uniform grip and strength, ideal for high-stress environments and precision applications.
Designed to anchor structures securely, these bolts resist corrosion and maintain durability in high-pressure and thermal conditions.
Engineered for exhaust systems, they provide excellent high-temperature resistance and withstand thermal cycling.
Used in heavy-duty wooden or masonry structures, these bolts combine corrosion resistance with exceptional durability.
Mitchell Stainless ensures stainless steel 321 / 321H stud bolt produced is quality-based and has appropriate testing under hardness, spectro analysis, PMI, flaring. Extended documentation is allowed in the invoice, details as related to packaging as well as its certificate of origin along with Third-party inspection certificate.
Stainless Steel 321/321H stud bolts are widely applied in high-temperature applications like petrochemical plants, refineries, and power generation. They are designed to be appropriate for the critical piping systems due to their flange, valve, and fitting due to their good resistance to oxidation at elevated temperatures. They also have applications in aerospace because they offer excellent resistance to intergranular corrosion resulting from exposure to temperatures within the range of chromium carbide precipitation.
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