At Mitchell Stainless in Hamilton, New Zealand, we supply stainless steel fasteners that deliver reliable performance in demanding conditions. Our Stainless Steel 321 Bolts are designed for applications where elevated temperatures and long-term stability are required. Known for their resistance to heat-related corrosion, these bolts are backed by Mitchell Stainless’ commitment to quality products and practical local support. We work closely with customers across industrial and engineering sectors to provide fastening solutions that perform consistently, even when exposed to ongoing heat and mechanical stress.
Stainless Steel 321 Bolts are manufactured from a titanium-stabilised austenitic stainless steel alloy containing chromium and nickel. The addition of titanium helps prevent carbide precipitation during prolonged heat exposure, reducing the risk of intergranular corrosion. This grade offers good tensile strength, excellent toughness, and reliable oxidation resistance at elevated temperatures. Stainless Steel 321 maintains structural integrity under thermal cycling, making it well suited to high-temperature service applications.
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 are commonly used in applications involving sustained or intermittent high temperatures. Typical uses include exhaust systems, heat exchangers, boilers, pressure vessels, and petrochemical processing equipment. They are also suitable for power generation facilities and industrial piping systems. At Mitchell Stainless, we regularly supply 321 bolts for engineering projects that require dependable performance under heat. Their resistance to heat-related degradation makes them a trusted fastening solution in demanding industrial environments.
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