Harsh Metalloys stands out as a top manufacturer and supplier of Stainless Steel 321 bolts, proudly based in Mumbai, India. We specialize in high-performance fastening solutions that excel in resisting heat, corrosion, and mechanical stress. Our SS 321 bolts are crafted from premium raw materials and precision engineering, tailored to meet the rigorous demands of industrial and high-temperature settings. We cater to a variety of industries, including petrochemical, aerospace, power generation, and thermal processing. Harsh Metalloys has built a reputation for delivering quality products on time and ensuring customer satisfaction. Our bolts are trusted not just across India but also in international markets for their durability, reliability, and adherence to global standards.
The Stainless Steel 321 bolts are made from a titanium-stabilized austenitic stainless steel alloy, which contains 17–19% chromium and 9–12% nickel. The addition of titanium helps prevent carbide precipitation during welding, boosting resistance to intergranular corrosion. These bolts boast a tensile strength of about 515 MPa and a yield strength of around 205 MPa. They also show remarkable resistance to oxidation up to 870°C, maintaining their mechanical integrity even under prolonged heat exposure. With excellent toughness, weldability, and high-temperature strength, they are perfect for fastening applications in thermally demanding and mildly corrosive environments.
Material | Specification | Standards | Size | Length |
Stainless Steel 321 Bolts | ASTM, ASME and API | ASTM B 193 / ASME SB 193 | M02 to M30 | 3 mm To 200 mm |
| Element | SS 321 |
| Tensile Strength (MPa) min | 480 |
| Yield Strength 0.2% Proof (MPa) min | 275 |
| Elongation (% in 50mm) min | 16 |
| Rockwell B (HR B) max Hardness | 95 |
| Brinell (HB) max Hardness | 201 |
| Element | SS 321 |
| Ni | 0.75 |
| C | 0.15 |
| Mn | 1.00 max |
| P | 0.04 max |
| S | 0.03 max |
| Si | 1.00 max |
| Cr | 11.5 – 13.5 |
| Mo | – |
| N | – |
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Stainless Steel 321 bolts are high-performance fasteners known for their excellent oxidation and corrosion resistance at elevated temperatures. Ideal for aerospace, chemical processing, and industrial applications, they ensure durability and reliability.
Custom Stainless Steel 321 Hex Bolt is a conformable fastener with a hexagonal head, providing excellent resistance to temperature rise and corrosion, ideal for precision applications in aerospace and industrial applications
Stainless Steel 321 leg bolt features a unique leg design for enhanced stability, providing excellent high-temperature and corrosion resistance. It is ideal for securing components in demanding industrial and aerospace environments.
Stainless Steel 321 expansion anchor bolt is designed for anchoring in concrete or masonry, offering superior high-temperature and corrosion resistance. It expands upon installation, ensuring secure and reliable fastening in harsh conditions.
Stainless Steel 321 hex flange head bolt features a hexagonal head with an integrated flange, providing high-temperature and corrosion resistance. Ideal for secure clamping in industrial and aerospace applications.
Stainless Steel 321 full threaded bolts are high-temperature resistant fasteners with continuous threading. They offer excellent corrosion and oxidation resistance, making them suitable for demanding industrial and aerospace applications.
All the required documentation, which are commercial invoice, packaging list, heat treatment chart, and quality assurance plan are given with Our Stainless Steel 321 Bolts. Furthermore, NABL-approved lab test reports, MTC, PMI Test Certificates, radiography test reports, and Third-Party Inspection Certificates also accompany to guarantee international standards for quality and satisfaction of our valued customers.
Stainless Steel 321 bolts find extensive use in industries like aerospace, petrochemical, oil and gas, and thermal processing. They are particularly well-suited for securing components in exhaust systems, furnace parts, boilers, heat exchangers, and high-temperature piping systems. Their resistance to intergranular corrosion and thermal fatigue makes them ideal for welded applications and environments that experience frequent temperature fluctuations. SS 321 bolts provide long-term reliability in harsh operating conditions, making them the go-to choice for engineers and manufacturers looking for secure fastening solutions in critical high-heat and oxidizing environments.
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