At Mitchell Stainless in Hamilton, New Zealand, we supply high-quality stainless steel fasteners engineered for high-temperature and demanding industrial applications. Our Stainless Steel 309S Nuts are low-carbon austenitic stainless steel fasteners designed to resist oxidation and scaling under prolonged heat exposure. Ideal for furnaces, kilns, heat exchangers, and thermal processing systems, these nuts provide durability, strength, and reliable performance in extreme conditions. Supported by Mitchell Stainless’ commitment to quality and local expertise, 309S nuts offer a trusted fastening solution for projects requiring heat-resistant, corrosion-resistant, and structurally stable components.
Stainless Steel 309S Nuts are manufactured from a low-carbon austenitic stainless steel alloy containing high chromium and nickel. The reduced carbon content minimizes carbide precipitation, enhancing resistance to intergranular corrosion during high-temperature service. These nuts provide excellent tensile strength, toughness, and dimensional stability under continuous heat exposure. Stainless Steel 309S maintains mechanical performance, hardness, and structural integrity in extreme thermal environments, making it suitable for high-temperature industrial applications where durability, corrosion resistance, and reliable fastening are essential.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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Corrosion-resistant product designed for high-temperature environments. Stainless Steel 309S Nuts are available in sizes from M6 to M36, ideal for furnace components and industrial applications requiring excellent heat and oxidation resistance.
Stainless Steel 309S Coupling Nuts are used to connect threaded rods in high-temperature settings. Sizes range from M6 to M36, suitable for furnace and kiln applications where durability and heat resistance are essential.
Stainless Steel 309S Nylon Insert Nuts feature a nylon insert to prevent loosening under high temperatures. Available in sizes from M6 to M24, they are ideal for securing components in industrial machinery and furnace applications.
Stainless Steel 309S Flange Hex Nuts offer enhanced load distribution with integrated flanges. Sizes range from M6 to M24, suitable for high-temperature environments such as kilns and industrial equipment, providing both strength and corrosion resistance.
Stainless Steel 309S Heavy Hex Nuts are designed for high-stress, high-temperature applications. Available in sizes from M6 to M36, they are ideal for use in industrial machinery and furnace components, ensuring exceptional strength and thermal stability.
Stainless Steel 309S Square Nuts provide a large surface area for effective torque application. Sizes range from M6 to M24, suitable for high-temperature and industrial applications, ensuring durability and stability in demanding environments.
We are providing a wide variety of certifications with our Stainless Steel 309S Nuts in order to satisfy a high quality standard. In our package, commercial invoices, packing lists, fumigation certificates, heat treatment charts, quality assurance plans, and approved laboratory test reports are provided. Besides, test certificate varying specifically for our Stainless Steel 309S Nuts. The set of certificates used by us consists of MTC as per EN 10204/3.1b, PMI Test Certificate, 100% radiography test report, and Third-Party Inspection Certificate. It will ensure full satisfaction and satisfaction for our customers and clients that these products carry complete certifications.
Stainless Steel 309S Nuts are commonly used in high-temperature and industrial applications. Typical uses include furnace and kiln assemblies, heat exchangers, boilers, thermal processing equipment, and petrochemical plant components. They are also suitable for power generation systems, industrial burners, and other mechanical systems exposed to sustained heat. At Mitchell Stainless, we supply 309S nuts for projects that require long-term reliability, corrosion resistance, and structural stability under extreme conditions. Their combination of heat resistance, toughness, and dependable fastening performance makes them a trusted solution for industrial, chemical, and high-temperature applications.
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