Home > Stud Bolts > Stainless Steel 321 / 321H Stud Bolts
Aditya Stainless, a well-respected manufacturer and supplier located in Kolkata, India, specializes in top-notch Stainless Steel 321 / 321H Stud Bolts. These bolts are crafted for tough industrial settings that face high temperatures and corrosive conditions. SS 321 is a titanium-stabilized austenitic stainless steel, celebrated for its remarkable resistance to intergranular corrosion post-welding. On the other hand, SS 321H is a high-carbon variant that offers enhanced strength at elevated temperatures. Manufactured to meet global standards like ASTM A193/A194, these stud bolts are perfect for critical applications in refineries, aerospace, power generation, and chemical processing industries, where long-lasting performance and thermal stability are crucial.
Stainless Steel 321 / 321H Stud Bolts are made up of 17–19% chromium and 9–12% nickel, with titanium added to prevent carbide precipitation during welding. The 321H grade features a higher carbon content (0.04–0.10%) for better creep resistance and performance at high temperatures. These bolts boast a tensile strength of at least 515 MPa, a yield strength of at least 205 MPa, and an elongation of about 35%. They can handle continuous service temperatures of up to 870°C, making them perfect for environments with thermal cycling. Their chemical makeup ensures they resist oxidation, scaling, and stress corrosion cracking under both mechanical and thermal stress.
| 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 % |
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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.
Aditya 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 find extensive use in high-temperature and pressure applications, including heat exchangers, boilers, furnace components, petrochemical units, and aircraft exhaust systems. Their ability to resist intergranular corrosion and oxidation makes them ideal for refineries, nuclear facilities, marine applications, and thermal processing units. The SS 321H variant, with its higher carbon content, is especially suited for superheaters and pressure vessels where enhanced strength under heat is essential.
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