Walid Stainless, based in Tunis, Tunisia, is a leading manufacturer and supplier of premium stainless steel products. Among their offerings are Stainless Steel 309 Nuts, designed for applications requiring exceptional high-temperature strength, oxidation resistance, and durability. These nuts are ideal for furnaces, boilers, heat exchangers, and industrial equipment operating under extreme thermal conditions. Each nut is manufactured with precision and undergoes rigorous quality control to ensure consistent performance. Clients rely on 309 Nuts from Walid Stainless for secure, reliable, and long-lasting fastening solutions in demanding high-temperature and industrial environments.
Stainless Steel 309 Nuts are made from a high-chromium, high-nickel austenitic stainless steel alloy containing approximately 23% chromium and 13% nickel, with low carbon content to prevent carbide precipitation. This composition provides excellent oxidation resistance, corrosion resistance, and mechanical strength at elevated temperatures. These nuts typically exhibit tensile strength between 550–700 MPa and hardness around 170–210 HB. The austenitic structure ensures toughness, thermal stability, and dimensional reliability under stress. 309 Nuts are suitable for high-temperature industrial applications requiring long-term performance and durability.
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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An ideal corrosion resistant material for high humidity environments. Stainless steel 309 nuts are available in sizes from M6 to M36, perfect for furnace parts, heat exchangers and industrial applications requiring high thermal resistance.
Stainless steel 309 coupling nuts are used to connect threaded cables under high temperature conditions. Sizes range from M6 to M36, making them suitable for use in furnace parts and heat exchangers, providing durability and heat resistance.
Stainless steel 309 nylon insert nuts make nylon inserts flexible for secure fastening in high temperature environments. Available in sizes from M6 to M24, they are ideal for applications in heat exchangers and industrial furnaces where stability is required.
Stainless steel 309 flange hex nuts for enhanced weight distribution with integrated flanges. Sizes range from M6 to M24, suitable for high temperature applications such as furnace components and heat exchangers, providing both strength and thermal resistance
Heavy duty stainless steel 309 hex nuts are designed for high pressure, high temperature applications. Available in sizes from M6 to M36, they are used in industrial machinery and furnace components, and offer exceptional strength and heat resistance.
Stainless steel 309 square nuts provide large surface area for efficient torque application. Sizes range from M6 to M24, making them suitable for hot environments such as heat exchangers and furnace parts, making them strong and durable.
We ensure complete documentation for our Stainless Steel 309 Nuts to make them transparent and reliable. Documents include a commercial invoice, a packaging list, a fumigation certificate, a heat treatment chart, and a quality assurance plan. It is accompanied by an NABL-approved lab test report, which satisfies stringent standards. Our commitment to quality is supported by various test certificates, like MTC as per EN 10204/3.1b, PMI Test Certificate, 100% radiography test report, and a Third-Party Inspection Certificate. These measures will collectively guarantee 100% client satisfaction and confidence in the integrity of our products.
Stainless Steel 309 Nuts are widely used in industries requiring heat-resistant, corrosion-resistant, and durable fastening solutions. They are ideal for furnace assemblies, boilers, heat exchangers, gas turbines, and other high-temperature industrial equipment. The austenitic structure ensures excellent mechanical durability, oxidation resistance, and dimensional stability under thermal stress. Engineers and technicians rely on 309 Nuts for secure, consistent, and long-lasting performance in extreme thermal and industrial environments. Walid Stainless ensures that each nut meets strict quality standards, providing dependable materials for demanding chemical, industrial, and high-temperature applications.
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