Stainless Steel 309 Nuts are tough fastening components crafted for high-temperature and corrosion-resistant applications. These nuts are built to last, offering impressive durability, thermal stability, and mechanical performance, which makes them perfect for demanding industrial settings like furnaces, boilers, and heat treatment systems. With their precision threading and accurate dimensions, Stainless Steel 309 Nuts ensure secure, leak-proof fastening and a long service life. Their sturdy design guarantees reliable performance even in extreme temperatures and oxidizing environments, making them a must-have for high-temperature piping and structural assemblies.
Made primarily from chromium and nickel, Stainless Steel 309 Nuts also include silicon and manganese to boost oxidation resistance and mechanical strength at elevated temperatures. They showcase high tensile strength, good hardness, and outstanding resistance to thermal fatigue, stress, and corrosion. The metallurgical properties of grade 309 ensure stability during thermal cycling and high-pressure situations. These nuts keep their mechanical integrity and resist scaling, making them perfect for applications that face continuous heat exposure, oxidizing atmospheres, and tough operating conditions.
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.
You’ll find Stainless Steel 309 Nuts in various industries, including power generation, petrochemical, oil and gas, furnace manufacturing, and heat treatment equipment. They’re often used to secure flanges, valves, pipelines, and structural assemblies that operate at high temperatures. Thanks to their resistance to oxidation, scaling, and thermal fatigue, they’re ideal for boiler systems, heat exchangers, kilns, and combustion equipment. Stainless Steel 309 Nuts deliver reliable, long-lasting, and maintenance-free fastening solutions in critical high-temperature and corrosive environments, ensuring both operational safety and structural integrity.
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