At Mitchell Stainless in Hamilton, New Zealand, we know that choosing the right fastener is about more than just size and strength—it’s about confidence on the job. Our Stainless Steel 321H Bolts are designed for high-temperature performance where reliability is non-negotiable. Supplied with care and backed by our experienced local team, these bolts are a trusted option for demanding industrial and engineering environments. We work closely with our customers to ensure they receive durable, fit-for-purpose solutions that stand up to heat, pressure, and long-term service.
Stainless steel 321H bolts provide excellent oxidation and corrosion resistance at high temperatures, up to 1500°F (815°C). They are designed for increased strength and stability, especially in tropical cycling conditions. The addition of titanium prevents carbide precipitation, and improves intergranular corrosion resistance. These bolts retain mechanical properties and are durable in harsh environments, making them ideal for space, chemical applications, and high temperature applications Their reliability ensures long-term performance and excellent performance under harsh conditions.
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 | – |
Contact us to get a quick quote for your requirement.
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 widely used in industries where high temperatures and structural integrity go hand in hand. Common applications include heat exchangers, pressure vessels, exhaust systems, refinery equipment, and petrochemical processing plants. They are also well suited to power generation and thermal processing environments where long-term heat exposure is unavoidable. At Mitchell Stainless, we regularly supply 321H bolts for projects that demand dependable performance under stress. Their proven resistance to heat-related degradation makes them a practical and trusted fastening solution.
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