Vinit Stainless, based in Chennai, India, is one of the leading manufacturers and suppliers of high-quality stainless steel products, serving a broad spectrum of industries. Among our premium offerings are Stainless Steel 321H Bolts, engineered from top-grade 321H stainless steel known for its superior resistance to oxidation and corrosion at elevated temperatures. The higher carbon content in 321H enhances strength, thermal stability, and durability, making it an ideal choice for heat exchangers, petrochemical applications, and power plants. With a strong focus on quality and industry compliance, Vinit Stainless delivers reliable fastening solutions built to withstand the most demanding operating environments.
The austenitic stainless steel alloy used to make Stainless Steel 321H Bolts is made up of roughly 17–19% Chromium, 9–12% Nickel, and a trace amount of Titanium (stabilizer) to stop carbide precipitation during welding. At temperatures as high as 815°C (1500°F), 321H provides improved creep strength and thermal stability due to its higher carbon content than standard 321. These bolts’ mechanical performance and dependability in high-stress and thermal cycling conditions are guaranteed by their exceptional intergranular corrosion resistance, tensile strength of approximately 515 MPa, and yield strength of 205 MPa.
Material | Specification | Standards | Size | Length |
Stainless Steel 321H Bolts | ASTM, ASME and API | ASTM B 193 / ASME SB 193 | M02 to M30 | 3 mm To 200 mm |
| Element | SS 321H |
| 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 321H |
| 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 321H bolts are high-performance fasteners designed for high-temperature environments, offering exceptional resistance to oxidation and corrosion. Ideal for aerospace, chemical processing, and industrial applications requiring durability and reliability.
Custom Stainless Steel 321H Hex Bolt is a custom designed fastener with a hexagonal head, designed for high temperature applications. It provides excellent corrosion resistance and strength, ideal for industrial, aerodynamic and aerospace applications.
Stainless Steel 321H leg bolt features a unique leg design for enhanced stability and support. It offers superior high-temperature and corrosion resistance, making it ideal for demanding industrial and aerospace applications.
Stainless Steel 321H expansion anchor bolt is designed for anchoring in concrete or masonry, providing exceptional high-temperature and corrosion resistance. It expands upon installation for secure, reliable holding in harsh environments.
Stainless Steel 321H Hex Flange Head Bolt connects the hexagonal head with an integrated flange, providing superior thermal corrosion resistance. Ideal for safe clamping in industrial and aerospace applications.
Stainless Steel 321H full threaded bolts feature continuous threading and excellent resistance to high temperatures and corrosion. They are ideal for securing components in demanding industrial, aerospace, and chemical processing environments.
We perform several tough tests to guarantee the reliability and performance of our products. Our Stainless Steel 321H Bolts are checked stringently for quality, and we also offer third-party inspection for added assurance. Our logistics are efficient enough to ensure that our delivery is prompt and on time to meet the demands of our clients without delay.
Stainless steel 321H bolts are extensively utilized in corrosive and high-temperature applications in a variety of industries, including power generation, construction, petrochemicals, chemical processing, and aerospace. They are perfect for heat exchangers, exhaust systems, boiler parts, and pressure vessels because of their exceptional resistance to oxidation, thermal fatigue, and intergranular corrosion. Long-term performance in demanding environments is guaranteed by their resistance to thermal cycling without losing structural integrity. These bolts are a reliable option in demanding industrial processes because they are appropriate for welded structures and applications that call for both mechanical strength and corrosion resistance in high temperature environments.
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