Home > Stud Bolts > Stainless Steel 321 / 321H Stud Bolts
Stainless Steel 321/321H stud bolts are produced in Dubai and India for applications that need high-temperature resistance and mechanical strength. These fasteners are made from titanium-stabilized austenitic stainless steel and come in full or partial thread configurations. The 321H version has a higher carbon content for better creep resistance. These stud bolts are commonly used in pressure vessels, exhaust systems, and heat treatment chambers. They are precision-manufactured with good surface finish and thread integrity, meeting ASTM A193 standards and supplied with material certifications, making them great for heavy-duty bolting in harsh conditions.
SS 321/321H contains 17–19% chromium, 9–12% nickel, with titanium (≥5×C%) as a stabilizer. 321H has a higher carbon content (up to 0.10%) for improved creep resistance. These stud bolts offer tensile strength of 515–620 MPa, yield strength of about 205 MPa, and elongation of 35%. Titanium prevents carbide precipitation during welding and heat exposure, which helps keep corrosion resistance. These bolts maintain dimensional and mechanical stability at temperatures up to 870°C. Their mix of toughness, hardness, and heat resistance guarantees reliable fastening performance under high pressure and thermal cycling.
| 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.
Harshita 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.
SS 321/321H stud bolts are used in high-temperature bolted joints like flanges, valves, turbine assemblies, and exhaust systems. Industries including petrochemical, power generation, shipbuilding, and aerospace use these bolts in critical high-stress settings. Their resistance to oxidation and intergranular corrosion allows them to work well in steam boilers, heat exchangers, furnace systems, and welded pipe networks. The 321H variant is ideal where creep strength matters. These stud bolts provide structural reliability, a long service life, and low maintenance in extreme mechanical and thermal conditions, making them essential for reliable fastened joints.
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