Harsh Metalloys is a reputable manufacturer and supplier of Stainless Steel 321H bolts, based in Mumbai, India. We take pride in providing high-quality, high-temperature-resistant fasteners that are specifically designed for tough industrial applications. Our SS 321H bolts are made from top-notch raw materials and cutting-edge manufacturing techniques, ensuring they deliver outstanding strength, durability, and performance. With years of experience under our belt, Harsh Metalloys caters to essential sectors like petrochemical, thermal processing, power generation, and aerospace. We’re known for our dedication to quality, precision engineering, and prompt delivery, making us a trusted supplier of stainless steel fastening solutions both in India and around the globe.
Stainless Steel 321H bolts are crafted from an austenitic stainless steel alloy that contains 17–19% chromium, 9–12% nickel, and titanium to resist intergranular corrosion. The higher carbon content in the “H” grade boosts creep strength and performance at elevated temperatures. These bolts provide a tensile strength of about 515 MPa and a yield strength of roughly 205 MPa. SS 321H bolts are excellent at resisting oxidation up to 870°C, while also offering good mechanical strength, ductility, and thermal stability. They are weldable and perform reliably in situations that involve thermal cycling and corrosive environments.
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.
You’ll find Stainless Steel 321H bolts commonly used in high-temperature and high-stress settings like furnace parts, exhaust systems, boilers, heat exchangers, and pressure vessels. They’re perfect for petrochemical and refinery operations, power generation facilities, and aerospace applications where resistance to oxidation, scaling, and thermal fatigue is crucial. SS 321H bolts maintain their mechanical integrity even under prolonged heat exposure, making them suitable for fastening in corrosive and oxidizing atmospheres. Their strength, durability, and thermal performance make them the go-to choice for critical fastening in demanding industrial systems.
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